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MCPF1525M06T-E/8ZW
Non Isolated POL DC/DC Converter, ITE & Industrial, B2LGA-69 , Buck Regulator Module, 600 mV
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- Manufacturer: MICROCHIP
- Product type: DC / DC Non Isolated Board Mount Converters - Adjustable Output
- SVHC: No SVHC (04-Feb-2026)
- Depth: 7.65mm
- Width: 6.8mm
- Height: 3.82mm
- Product Range: -
- Output Power Max: -
- Output Current Max: 28A
- Output Voltage Max: 1.8V
- Output Voltage Min: 600mV
- Input Voltage DC Max: 16V
- Input Voltage DC Min: 4.5V
- DC / DC Converter Type: B2LGA-69 , Buck Regulator Module
- Power Supply Applications: ITE & Industrial
- DC / DC Converter Output Type: Adjustable
| Delivery and price | |
|---|---|
| Units per pack | 500 |
| Price | 12.81 € |
| Current stock | 100+ |
| Lead time | 30 days |
Datasheet
**16V, 25A Stackable Switching Buck Regulator Module MCPF1525M06**
## **Description**
The MCPF1525M06 is a fully integrated, highly efficient, and user-friendly point-of-load voltage regulator module. It incorporates an on-chip pulse-width modulation (PWM) controller, integrated MOSFETs, and built-in inductors and capacitors, resulting in a compact and precise solution. Its low-profile package is optimized for automated assembly using standard surface-mount equipment. The MCPF1525M06 supports programmable operation via I[2] C and PMBus[™] protocols. Comprehensive development and optimization have resulted in the smallest, most efficient, and fully featured 25A–200A point-of-load solution available today. Integrated protection features include pre-biased start-up, soft-start protection, overvoltage protection, thermally compensated overcurrent protection with hiccup mode, and thermal shutdown with auto-recovery.
## **Features**
- POL Module With Integrated Inductor
- Small 6.8 mm × 7.65 mm × 3.82 mm Size
- 25A Continuous Output Rating
- Can be Stacked to 8 Modules for 200A Output
- No External Compensation is Required
- Differential Remote Voltage Sensing
- Programmable Operation With I[2] C and PMBus
- 4.5V to 16V Input Voltage Range
- Output Voltage up to 1.8V
- Enable Input, Can Implement Programmable Undervoltage Lockout
- Power Good Output
- −40°C to 125°C Operating Range
- Lead and Halogen Free
- REACH and RoHS Compliant
## **Applications**
- Telecommunications and Networking
- Data Center
- Storage
- Industrial
- Distributed Point of Load
- Computing Peripherals
Data Sheet
DS60001915A - 1
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06**
## **Typical Application Circuits**
**Figure 1.** 25A Single Module
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CB SW1<br>PVIN PVIN<br>VOUT<br>VIN<br>MCPF1525M06<br>SDA SYNC<br>SCL CLKOUT<br>SALERT ISHR<br>ADDR FB<br>EN RSO<br>PG RS+<br>Load<br>PS RS-<br>AGND PGND<br>**----- End of picture text -----**<br>
**Figure 2.** 50A, Two Stacked Modules
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**----- Start of picture text -----**<br>
CB SW1 SW1 CB<br>PVIN PVIN PVIN PVIN<br>VOUT VOUT<br>VIN VIN<br>MCPF1525M06 MCPF1525M06<br>SDA SYNC SYNC SDA<br>SCL CLKOUT CLKOUT SCL<br>SALERT ISHR ISHR SALERT<br>ADDR FB FB ADDR<br>EN RSO RSO EN<br>PG RS+ RS+ PG<br>PS RS- RS- PS<br>AGND PGND PGND AGND<br>Load<br>**----- End of picture text -----**<br>
Data Sheet
DS60001915A - 2
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06**
## **Block Diagram**
**==> picture [505 x 312] intentionally omitted <==**
**----- Start of picture text -----**<br>
VIN VCC PVCC<br>LDO<br>PVCC PVIN<br>FAULT<br>RSO FB PVIN<br>SCL<br>CB<br>SDA HDRV1<br>REF. DAC<br>SALERT SW1<br>PWM LDRV1<br>SYNC Digital Core SOFT-START Pulse Width Modulator Drivers and SW2<br>ADDR Drive HDRV2 Power<br>PLL Logic Stage<br>PS LDRV2<br>CLKOUT L1<br>HDRV1 VOUT1<br>VCC<br>HDRV2<br>FAULT<br>FAULT L2<br>VOUT2<br>TSD<br>SW1 PGND<br>Control<br>FB and Fault SW2 Remote<br>EN Logic FB Sense Amp<br>RS+<br>PG<br>RS-<br>RSO<br>POR<br>LDRV1<br>RSO<br>LDRV2<br>AGND<br>**----- End of picture text -----**<br>
Data Sheet © 2026 Microchip Technology Inc. and its subsidiaries
DS60001915A - 3
**MCPF1525M06 Pin Configuration**
## **1. Pin Configuration**
|**Pin Name**|**Pin Number**|**Pin Description**|
|---|---|---|
|PVIN|1-4, 51, 52|Power input for the power stage driver circuits|
|BOOT1|5|Bootstrap pin for the phase 1 driver|
|BOOT2|6|Bootstrap pin for the phase 2 driver|
|SYNC|7|Synchronization clock input|
|VIN|8|Input supply for the internal LDO. Bypass with a 1 μF MLCC capacitor and connect<br>to PVIN with a 2.7Ω resistor.|
|PVCC|9|Input supply for the drivers. Connect to VCC on the application board.|
|VCC|10|Output of the internal LDO. Can be used as an input for an externally applied bias.<br>Bypass with a 1 μF MLCC capacitor and connect to the PVCC pin to supply the<br>drivers. Input supply for the drivers.|
|PS|11|Phase setting selection pin. Connect a resistor from this pin to AGND to set the<br>device as host or client as well as the number of devices connected in parallel to<br>determine the relative phasing.|
|ADDR|12|Program the device address on the I2C and PMBus using a resistor from this pin to<br>AGND.|
|VFB|13|Feedback voltage for the device. Connect to RSO if the remote sensing amplifer is<br>used. Otherwise, connect to the output voltage.|
|RSO|14|Output of the remote voltage sensing amplifer|
|VOUT2|15, 16, 17|Power output from phase 2 of the regulator. VOUT1 and VOUT2 should be<br>shorted together and connected to the power output plane. Connect the output<br>bypass capacitors from the power output plane to the power ground (PGND)<br>plane.|
|RS+|18|Input of the remote diferential sense amplifer. Connect this pin to the output<br>voltage at the load.|
|RS-|19|Input of the remote diferential sense amplifer. Connect this pin to ground at the<br>load.|
|ISHARE|20|Current share bus pin.|
|VOUT1|21, 22, 23|Power output from phase 1 of the regulator. VOUT1 and VOUT2 should be<br>shorted together and connected to the power output plane. Connect the output<br>bypass capacitors from the power output plane to the power ground (PGND)<br>plane.|
|FAULT#|24|Shares fault information with any parallel-connected devices. Active low. Must be<br>pulled to VCC or another 5V source through a suitable resistance (5 kΩ) to allow<br>device operation.|
|EN|25|Enable input used to turn the device on and of. It can be used to implement a<br>UVLO function using an external resistor divider.|
|SCL|26|I2C or PMBus clock line. Pull up to the bus rail using a 4.99 kΩ resistor.|
|SDA|27|I2C or PMBus data line. Pull up to the bus rail using a 4.99 kΩ resistor.|
|SALERT|28|PMBus SMBALERT# line. Used to notify a host of an abnormal condition. Pull up to<br>the bus rail using a 4.99 kΩ resistor.|
|CLKOUT|29|Phase-shifted clock output. For paralleled modules, connect this pin to the SYNC<br>pin of the next part in the phase sequence.|
|PG|30|Open-drain power good output. Connect to VCC or an external bias using a<br>resistor.|
|PGND|31-35, 56-63|Power ground for the power stage of the device. Connect to the output power<br>ground plane.|
|SW1|36-43|Switched node of phase 1. Connect two 4.7 μF MLCC capacitors in parallel<br>between this pin and CB.|
|NC|44|Not used, leave foating|
Data Sheet
DS60001915A - 4
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Pin Configuration**
## **Pin Configuration** (continued)
|**Pin Confguraton**(contnued)|**Pin Confguraton**(contnued)|**Pin Confguraton**(contnued)|
|---|---|---|
|**Pin Name**|**Pin Number**|**Pin Description**|
|CB|45-50, 53-55|External fying capacitor connection. Connect two 4.7 μF MLCC capacitors between<br>this pin and SW1.|
|AGND|64-69|Signal ground for the internal circuitry. Must be at least Kelvin-connected to the<br>PGND net. Avoid routing that causes power currents to fow on this net.|
## **1.1. Package Type**
**Figure 1-1.** 8ZW Package, Top View
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50 49 48 47 46 45 44 43 42 41 40 39 38 37 36<br>1 35<br>2 34<br>51 52 53 54 55 56 57 58 59 60 61 62 63<br>3 33<br>4 32<br>5 31<br>6 66 65 64 30<br>7 67 68 69 29<br>8 28<br>9 27<br>10 15 16 17 21 22 23 26<br>11 12 13 14 18 19 20 24 25<br>**----- End of picture text -----**<br>
Data Sheet
DS60001915A - 5
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Functional Description**
## **2. Functional Description**
## **2.1. Overview**
The MCPF1525M06 is a fully integrated, highly efficient, and user-friendly DC/DC regulator. Its output voltage and system optimization settings can be easily programmed via the I[2] C/PMBus[™] protocol. Featuring a proprietary modulator, the MCPF1525M06 delivers a rapid transient response. Internal stability compensation enables reliable operation across a wide range of applications and with different types of output capacitors, without concerns about loop stability.
This versatile device offers extensive flexibility for configuration and system monitoring through the I[2] C and PMBus[™] interfaces. Additionally, it supports standalone operation without a digital interface, allowing designers to set output voltages simply by adjusting resistor dividers and to monitor system status using the Power Good output.
## **2.2. Operation and Topology**
The MCPF1525M06 utilizes a modified interleaved buck converter topology that incorporates an coupling capacitor (CB) in the power path. This design reduces voltage stress on the internal power devices, allowing for smaller component sizes and lower switching losses than those of a conventional interleaved buck converter with the same rating. Additional benefits include a higher on-time, twice that of a standard buck converter for the same voltage conversion ratio, and inherent current sharing between the two phases, which is facilitated by the coupling capacitor.
## **2.3. Bias Voltage**
The MCPF1525M06 features an integrated Low Drop-Out (LDO) regulator that supplies the DC bias voltage required for its internal circuits, typically providing an output of 5.2V. The input to this LDO is the VIN pin. For single-rail operation with internal bias, the VIN pin should be connected to the PVIN pin (see Figure 2-1). If an external bias voltage is preferred, connect the VIN pin to the VCC pin to bypass the internal LDO regulator (see Figure 2-2). A separate PVCC pin is provided to supply bias to the drivers, and this should be connected to VCC in the application circuit. It is recommended that VIN has a minimum slew rate of 0.06V/ms. Note that PVIN has internal undervoltage detection, which latches the device off if PVIN drops below 4.2V.
Data Sheet
DS60001915A - 6
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Functional Description**
**Figure 2-1.** Using EN Pin as an Adjustable UVLO, Single Rail Operation Using Internal LDO
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**----- Start of picture text -----**<br>
PVIN<br>PVIN VIN<br>REN1<br>EN VCC<br>MCPF1525M06<br>PVCC<br>REN2<br>**----- End of picture text -----**<br>
When using the EN pin as an adjustable UVLO, the threshold can be calculated as follows:
REN1 + REN2 PVINUV = ENHIGH × REN2
**Figure 2-2.** Using an External VCC Supply
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**----- Start of picture text -----**<br>
Ext VCC<br>PVIN<br>PVIN VIN<br>VCC<br>EN MCPF1525M06 PVCC<br>**----- End of picture text -----**<br>
Data Sheet
DS60001915A - 7
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Functional Description**
The supply voltage—whether internal or external—ramps up with VIN and does not require activation via the EN pin. As a result, I[2] C/PMBus[™] communication can begin as soon as the following conditions are met:
- The VCC_UVLO start threshold is reached
- Memory contents are loaded
- Initialization is complete
- The address offset is read
The I[2] C bus lines (SCL and SDA) must be pulled up to either VCC or the system I[2] C bus voltage with an external resistor. The MCPF1525M06 supports two selectable I[2] C bus voltage ranges, which can be set using the BUS_VOLTAGE_SEL bit in register 0x91:
**Table 2-1.** ISC Bus Voltage Control
|**Register**|**Bit**|**Name**|
|---|---|---|
|0x91|[2]|BUS_VOLTAGE_SEL<br>0: 1.8V to 2.5V<br>1: 3.3V – 5V|
## **2.4. I[2] C Base Address and Offsets**
The MCPF1525M06 includes user-configurable registers for setting its I[2] C and PMBus[™] base addresses. By default, the I[2] C base address is 0x10 and the PMBus[™] base address is 0x70. An address offset ranging from 0 to 15 can be selected by connecting the ADDR pin to the AGND pin, either directly or through a resistor. During startup, an address detector measures the resistance of this connection to determine the offset value, which is then added to the base I[2] C address to establish the device’s I[2] C communication address. The same offset is also applied to the base PMBus[™] address to set the PMBus[™] communication address.
To select offsets from 0 to 15, select the resistance from ADDR to AGND as follows:
**Table 2-2.** I[2] C/PMBus address offset resistors
|**Ofset **|**Resistance (kΩ)**|
|---|---|
|0|0|
|1|1.13|
|2|1.87|
|3|2.61|
|4|3.4|
|5|4.12|
|6|4.87|
|7|5.62|
|8|6.34|
|9|7.15|
|10|7.87|
|11|8.66|
|12|9.31|
|13|10.2|
|14|11|
|15|12.1|
**Note:** Do not select the address 0x0C. This is the Alert Response Address used in the SMBus Alert Response Protocol.
Data Sheet
DS60001915A - 8
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Functional Description**
## **2.5. Soft-Start and Target Output Voltage**
The MCPF1525M06 features an internal digital soft-start circuit that manages the output voltage ramp-up and limits inrush current during startup. When the startup conditions are satisfied, the soft-start process begins, ramping the output voltage toward the set reference at a rate specified by the TON_RISE registers (via the TON_RISE command), provided the following conditions are met:
- A valid enable signal is detected, as determined by the EN pin voltage, OPERATION register, and ON_OFF_CONFIG register.
- The input voltage PVIN is above the level set by PVIN UVLO threshold, which is set by the VIN_ON registers.
- The flying capacitor (CB) has been pre-charged to PVIN/2 by the internal pre-charge circuit, ensuring balanced PVIN/2 voltages across all FETs when switching begins.
During initial startup, the MCPF1525M06 uses minimum-width High-Drive (HDRV) pulses until the output voltage starts to rise (refer to the minimum on-time and off-time values in the electrical specifications). The on-time is gradually increased until VOUT reaches the target value set by the VOUT_COMMAND registers. While not strictly required, it is recommended to place a 100Ω resistor in parallel with the output capacitors (COUT) to ensure optimal startup performance.
**Figure 2-3.** Operational Waveforms at Startup
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**----- Start of picture text -----**<br>
EN<br>Initialization complete<br>PG<br>Internal<br>Soft-Start<br>0.85*VOUT<br>VOUT<br> SS time<br>**----- End of picture text -----**<br>
Overcurrent Protection (OCP) and Overvoltage Protection (OVP) are active during soft-start to safeguard against short circuits and excessive voltage levels.
A resistor divider can be used with the MCPF1525M06 device to set the required output voltage (see Figure 2-4). This approach allows system designers to configure all power rails within the full output voltage range (0.6–1.8V) using just one device.
Data Sheet
DS60001915A - 9
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Functional Description**
**Figure 2-4.** Using an External Voltage Divider to Set the Output Voltage
**==> picture [235 x 181] intentionally omitted <==**
**----- Start of picture text -----**<br>
VOUT PVIN<br>PVIN VIN<br>RTOP<br>FB VCC<br>MCPF1525M06<br>PVCC<br>RBOTTOM<br>**----- End of picture text -----**<br>
The following equation can be used to calculate the resistor values in the voltage divider:
RTOP × RBOTTOM RTOP + 47.5 VOUT = VFB × 1 + RBOTTOM
Where:
- VOUT is the desired output voltage
- VFB is the voltage at the feedback pin, 600 mV for the MCPF1525M06
- RTOP is the value in kΩ
- RBOTTOM is the value in kΩ
It is recommended that RTOP be 1 kΩ and that a 2.7 nF feed forward capacitor is placed in parallel with it.
Alternatively, the output voltage can be configured via the I[2] C/PMBus[™] command VOUT_COMMAND or the corresponding registers, eliminating the need for an external resistor divider. The MCPF1525M06 supports this command with a resolution of 1/1024V, and a reference resolution of 5 mV. Additionally, the initial output voltage can be selected using the PS resistor, which allows the user to choose from one of eight pre-programmed user register pairs (see the Phase Setting Pin section for details).
## **2.6. Shutdown Mechanisms**
The MCPF1525M06 offers two shutdown options:
- **Hard Shutdown or Load-Dependent Decay:**
- When a valid hard-disable signal is detected (as determined by the EN pin, OPERATION register, ON_OFF_CONFIG register, input voltage PVIN, and the PVIN UVLO threshold set by the VIN_ON registers), both drivers are immediately turned off and the soft-start signal is pulled down immediately.
- **Soft-Stop or Controlled Ramp-Down:**
Data Sheet
DS60001915A - 10
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Functional Description**
When a valid soft-off request is received (as defined by the EN pin, OPERATION register, and ON_OFF_CONFIG register), there is a delay specified by the TOFF_DELAY registers. After this delay, the soft-start voltage ramps down to 0 over a period set by the TOFF_FALL registers. The drivers are disabled only once the SS signal reaches 0. Ramping the soft-start voltage down causes the output voltage to decrease smoothly to 0.
By default, the device is set to perform a hard shutdown. Shutdown triggered by PVIN is always executed as a hard shutdown.
## **2.7. Phase Setting Pin (PS)**
The PS pin on the MCPF1525M06 serves multiple functions:
1. **Parallel Operation:** When using multiple MCPF1525M06 devices in parallel, the phase relationship between modules (and thus the total number of devices) can be set by connecting a specific resistor value from the PS pin to AGND. In this configuration, the PS pin is used to designate one module as the “host.”
2. **Switching Frequency Selection:** Certain resistor values, as shown in Table 2-3 below, allow the PS pin to set the device’s switching frequency. It is recommended to select the switching frequency based on the output voltage according to:
- 700 kHz × VOUT ≤fSW ≤1.1 MHz × VOUT
3. **Initial Output Voltage Selection:**
- The PS resistor can also be used to set the initial output voltage at startup, according to the values in Table 2-3. Any subsequent output voltage changes made via PMBus commands will override this initial setting.
**Table 2-3.** PS Resistor Values and Functions
|**RPS, kΩ**|**Host/Client**|**Phase degrees**|**Initial VOUT**|**FSW (MHz)**|
|---|---|---|---|---|
|0|Host|0|0.6|SeeTable 2-4|
|1.13|Client|180|0.6|Sync to host|
|1.87|Client|120|0.6|Sync to host|
|2.61|Client|90|0.6|Sync to host|
|3.4|Client|72|0.6|Sync to host|
|4.12|Client|60|0.6|Sync to host|
|4.87|Client|51.4|0.6|Sync to host|
|5.62|Client|45|0.6|Sync to host|
|6.34|Host|0|0.6|1.5|
|7.15|Host|0|1.2|1.25|
|7.87|Host|0|0.6|1.04|
|8.66|Host|0|0.6|0.892|
|9.31|Host|0|0.9|0.781|
|10.2|Host|0|0.85|0.694|
|11|Host|0|0.8|0.625|
|12.1|Host|0|0.7|0.568|
The default voltage setting when operated in one of the host modes with RPS 6.34 kΩ or greater can be programmed using registers 0x9D through 0xAC. These registers are in pairs for each setting, an upper byte and a lower byte. The high byte uses only bit [0] and the low byte uses bits [7:0] giving a 9 bit value. The default voltage can be calculated by:
VBOOT = value × 5 mV + 500 mV
Where:
Data Sheet
DS60001915A - 11
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Functional Description**
- VBOOT is the default boot up voltage
- _value_ is the value in bits[8:0] in the upper and lower registers
**Table 2-4.** Switching Frequencies and Output Voltages
|**VOUT range (V)**|**fSW (MHz)**|
|---|---|
|< 0.85V|0.625|
|0.85V < VOUT< 1.1V|0.781|
|1.1V < VOUT< 2.1V|1.25|
## **2.8. Minimum Values for On-Time, Off-Time, and PVIN**
When the input voltage (PVIN) is much higher than the desired output voltage, the control MOSFETs are switched on for shorter durations. The shortest reliable on-time is defined by the minimum on-time (TONMIN). During startup, when the output voltage is still low, the MCPF1525M06 operates at this minimum on-time.
The maximum conversion ratio is limited by two main factors:
1. **Minimum Off-Time (TOFFMIN):** When the input voltage is close to the output voltage, the control MOSFET remains on for longer periods, and the minimum time it can be reliably turned off is defined by the minimum off-time (TOFFMIN). During this interval, the synchronous MOSFET is on, and its current is monitored for overcurrent protection. This sets the lowest input voltage at which the device can still regulate the output to the target voltage.
2. **Phase Balance and Duty Cycle Limits:** To ensure balanced switching between both phases (or to keep the voltage on the CB pin at 0.5 × PVIN), this topology requires that the high-side switches of the two phases do not overlap, unlike a conventional interleaved buck converter. This imposes a theoretical maximum duty cycle of 50% per phase and a maximum conversion ratio of 25%. In practice, accounting for circuit delays and dead times, the conversion ratio should not exceed 16% at full load.
Both system efficiency and load transient requirements can impact the maximum conversion ratio. It is recommended that system designers verify these values within their specific applications.
## **2.9. Enable (En) Pin**
The Enable (EN) pin serves multiple purposes:
- **Primary On/Off Control:**
By default, as set by the ON_OFF_CONFIG command, the EN pin is used to turn the MCPF1525M06 on or off. It features a precise threshold that is monitored by the internal UVLO (Under-Voltage Lockout) circuit. If the pin is left unconnected, an internal 1 MΩ pull-down resistor ensures the MCPF1525M06 remains off to prevent accidental activation.
- **Input Voltage UVLO Implementation:**
The EN pin can be used to set an accurate input voltage UVLO threshold. Its input is derived from PVIN through external resistor dividers (REN1 and REN2, see Figure 2-1). By adjusting these resistor values, users can program the UVLO threshold voltage, allowing for more precise control over PVIN UVLO levels than what is possible with the VIN_ON/VIN_OFF commands.
- **Power Sequencing:**
The EN pin can also be used to monitor other power rails, enabling specific power sequencing schemes (see the figure below).
Data Sheet
DS60001915A - 12
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Functional Description**
**Figure 2-5.** Using EN to Monitor Another Rail
**==> picture [225 x 217] intentionally omitted <==**
**----- Start of picture text -----**<br>
RAIL #2 PVIN<br>PVIN VIN<br>REN1<br>EN VCC<br>MCPF1525M06<br>PVCC<br>REN2<br>**----- End of picture text -----**<br>
## **2.10. Overcurrent Protection (OCP)**
The MCPF1525M06 implements Overcurrent Protection (OCP) by monitoring the current through the RDS(ON) of the Synchronous MOSFET. If the sensed current exceeds the OCP threshold, a fault is triggered. This approach offers several advantages:
- Delivers accurate overcurrent protection without impacting converter efficiency, as the current sensing is lossless.
- Eliminates the need for a dedicated current-sense resistor, reducing cost.
- Minimizes layout-related noise issues.
The OCP threshold is set using the IOUT_OC_FAULT_LIMIT command or the corresponding user registers and can be programmed in 0.5A increments up to a maximum of 37.5A. The threshold is internally compensated to remain nearly constant across varying ambient temperatures.
When the current surpasses the OCP threshold, the PG and SS signals are pulled low. The Synchronous MOSFET stays on until the current drops to zero, after which the MCPF1525M06 enters hiccup mode (see Figure 2-6). During hiccup-blanking, both the Control and Synchronous MOSFETs remain off. After this period the MCPF1525M06 attempts to restart. If the overcurrent condition persists, the cycle repeats. The device will stay in hiccup mode until the fault is cleared. Alternatively, the MCPF1525M06 can be configured to enter a latched shutdown mode upon detecting an overcurrent fault using the IOUT_OC_FAULT_RESPONSE command or the corresponding register.
Data Sheet
DS60001915A - 13
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Functional Description**
**Figure 2-6.** Hiccup Overcurrent Operation
**==> picture [176 x 138] intentionally omitted <==**
**----- Start of picture text -----**<br>
Current limit<br> hiccup blanking time<br>HDrv<br>LDrv<br>PG<br>**----- End of picture text -----**<br>
## **2.11. Overvoltage Protection (OVP)**
Overvoltage Protection (OVP) is implemented by monitoring the voltage at the FB pin. If the FB voltage exceeds the OVP threshold for longer than the specified OVP delay (typically 5 μs), a fault is triggered.
The OVP threshold is set using the VOUT_OV_FAULT_LIMIT command or the corresponding user registers. This command allows the overvoltage limit to be configured relative to the output voltage, with a resolution of 1/1024V. Internally, however, the threshold is rounded to one of four discrete settings, as detailed in the table below.
**Table 2-5.** VOUT_OV_FAULT_LIMIT Actual Values
|**VOUT_OV_FAULT_LIMIT**<br>**(Relative to VOUT_COMMAND Value)**|**Actual OVP Threshold**<br>**(Relative to VOUT_COMMAND Value)**|
|---|---|
|100.0% < Setting ≤ 105.4%|105%|
|105.4% < Setting ≤110.1%|110%|
|110.1% < Setting ≤ 114.8%|115%|
|114.8% < Setting, or Setting ≤ 100%|120% (Default)|
The default OVP threshold is set to 120%. When this limit is exceeded, all MOSFETs are immediately turned off and the PG pin is pulled low. The MOSFETs remain latched off until the fault is cleared by cycling either VCC or the EN pin. Figure 2-7 illustrates the timing sequence for overvoltage protection.
Data Sheet
DS60001915A - 14
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Functional Description**
**Figure 2-7.** OVP Protection - Latched Response
**==> picture [210 x 181] intentionally omitted <==**
**----- Start of picture text -----**<br>
HDrv<br>LDrv<br>120% VOUT<br>90% VOUT<br>VOUT<br>PG<br>OVP delay = 5 µs<br>**----- End of picture text -----**<br>
The MCPF1525M06 offers output overvoltage and undervoltage warning features, as well as output undervoltage fault protection. These are configured using the VOUT_OV_WARN_LIMIT, VOUT_UV_WARN_LIMIT, and VOUT_UV_FAULT_LIMIT commands (or their corresponding user registers). Unlike the overvoltage protection mechanism—which uses an all-analog signal path and a high-speed internal comparator—these warning and fault thresholds are determined by digitally comparing the processed VOUT telemetry data to the set limits.
## **2.12. Overtemperature Protection (OTP)**
The MCPF1525M06 features internal temperature sensing, with a programmable threshold that can be set in 1°C increments using the OT_FAULT_LIMIT command (or the corresponding user registers). If this programmable threshold is set below the fixed analog limit of 145°C, it determines the trip point by digitally comparing the reported temperature (READ_TEMPERATURE) to the OT_FAULT_LIMIT value.
When the measured temperature exceeds the set threshold, the device will either continue normal operation (default) or enter a latched shutdown, depending on the configuration of the OT_FAULT_RESPONSE PMBus command (or the relevant registers). To recover from a latched shutdown, either the EN pin or OPERATION command must be cycled.
Additionally, an overtemperature warning threshold can be set using the OT_WARN_LIMIT command. This warning threshold is typically configured below the fault threshold and can be used to trigger an alarm via the PMBus[™] ALERT pin and the STATUS_TEMPERATURE command.
## **2.13. Power Good (PG)**
The behavior of the Power Good (PG) signal is determined by the user-configurable PGControl register bit and the POWER_GOOD_ON command. When PGControl is enabled, the PMBus[™] command allows the upper power good threshold to be set relative to the output voltage, with a resolution of 1/1024V. Internally, however, this value is rounded to one of four discrete settings, as indicated in the table below.
Data Sheet
DS60001915A - 15
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Functional Description**
**Table 2-6.** POWER_GOOD_ON Actual Values
|**POWER_GOOD_ON**<br>**(Relative to VOUT_COMMAND Value)**|**Actual Threshold**<br>**(Relative to VOUT_COMMAND Value)**|
|---|---|
|95.1% < Threshold, or Threshold ≤ 79.6%|80%|
|79.6% < Threshold ≤ 85.1%|85% (Default)|
|85.1% < Threshold ≤ 89.8%|90%|
|89.8% < Threshold ≤ 95.1%|95%|
The default setting is 85%, meaning the PG signal is asserted when the voltage at the FB pin rises above 85% of the VOUT_COMMAND value. The lower threshold is 5% below the upper threshold. If the voltage at the FB pin falls below this lower threshold, the PG signal is de-asserted (pulled low).
## **PGControl Bit Set to 1 (Default)**
The PGControl bit is in register 0x91, bit[3]. There is no corresponding way to configure this using PMBus.
**Table 2-7.** PGControl Bit
|**Register**|**Bit**|**Name**|
|---|---|---|
|0x91|[3]|PGControl<br>0: PG Based on PGOOD_ON_COMMAND<br>1: PG Based on DAC|
**Figure 2-8.** PG Behavior With PGControl Set to 1
**==> picture [304 x 103] intentionally omitted <==**
**----- Start of picture text -----**<br>
85% VOUT 80% VOUT 85% VOUT<br>VOUT<br>PG<br>**----- End of picture text -----**<br>
The behavior of the PG signal is consistent during both start-up and normal operation. The PG signal is asserted when all of the following conditions are met:
- Both EN and VCC are above their respective thresholds
- No faults are present (including overcurrent, overvoltage, or overtemperature)
- VOUT remains within the specified range (as determined by continuous monitoring of whether FB is above the PG threshold)
## **PGControl Bit Set to 0**
The figure below shows PG behavior in this situation:
Data Sheet
DS60001915A - 16
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Functional Description**
**Figure 2-9.** PG Behavior With PGControl Set to 0
**==> picture [304 x 162] intentionally omitted <==**
**----- Start of picture text -----**<br>
85% VOUT 80% VOUT 85% VOUT<br>VOUT<br>98% of target VOUT<br>Int SS<br>PG<br>**----- End of picture text -----**<br>
During normal operation, the PG signal functions as it does when the PGControl bit is set to 1. However, at start-up, the PG signal is asserted once the FB pin is within 2% of the target output voltage, rather than when it exceeds the upper PG threshold.
Additionally, the MCPF1525M06 includes an internal PMOS transistor in parallel with the NMOS connected to the PG pin (see block diagram). This PMOS ensures that the PG signal remains at a logic low level even if VCC is low and the PG pin is pulled up to an external voltage different from VCC.
## **2.14. Remote Output Voltage Sensing (RS)**
The MCPF1525M06 features high-performance true differential remote sensing to maintain output voltage accuracy by sensing the output voltage directly across the actual load, thereby compensating for voltage drops caused by high current. The remote sense amplifier is designed with a fast slew rate and both source and sink current capabilities, enabling it to respond quickly to output transients. This amplifier output is the source for the ADC that provides the data for the PMBus READ_VOUT command, and the registers VOUT_REPORT_LOWER (0xD6) and VOUT_REPORT_UPPER (0xD7). The resolution is 10 bits or 1/1024V.
## **2.15. Parallel Operation**
MCPF1525M06 devices support parallel operation, allowing multiple units to be connected to the output voltage simultaneously and increasing load current capability. For all devices—including both host and client units—the RS+ pin should be tied to the output voltage, and the RS– pin should be connected to the ground reference.
For the host device, the RS+ and RS– inputs of the remote sense amplifier must be connected directly to the output voltage at the precise regulation point. This setup provides accurate feedback and compensates for voltage drops along the distribution path, ensuring optimal circuit performance.
Client devices are primarily responsible for current sharing, with voltage regulation being a secondary concern. Therefore, there is greater flexibility in how their RS+ and RS– pins are connected. While it is ideal to connect these pins to the same remote sense point as the host for consistency, this may not be practical due to the need for extensive PCB traces. In such cases, connecting the RS+ and RS– pins of client devices to the local output capacitors is recommended.
Data Sheet
DS60001915A - 17
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Functional Description**
Device synchronization is achieved using the SYNC and CLKOUT pins, while the ISHARE pin facilitates current sharing among devices. The PS pin serves two purposes: on the host device, it sets the switching frequency; on client devices, it determines the phase relationship between the SYNC signal and the PWM clock, depending on the number of devices operating in parallel. This configuration enables interleaved operation with correct phase alignment for optimal system-level performance.
The MCPF1525M06 FAULT pin functions as both an input and output. It must be pulled up to VCC (or another 5V supply) for proper operation, even when only one device is used. In parallel configurations, the FAULT pin is essential for system protection, ensuring that a fault in any device is communicated to all others, causing them to shut down as well.
When operating modules in parallel, all must be configured identically for VOUT. There can be up to a 200 mV difference in the VOUT configuration between the host and client modules that is compensated for by the current share bus. Changing the output voltage in such a case can be done by first changing the host module and then changing the client modules in less than 200 mV increments. Changes larger than 200 mV can be made in successive steps.
## **2.16. Synchronization**
If the device is synchronized to an external clock, the SYNC signal thresholds are 0.775 × VCC (high) and 0.45 × VCC (low). The clock frequency applied to the SYNC pin should be twice the desired PWM frequency, within the range of 568 kHz to 1.5 MHz.
Data Sheet © 2026 Microchip Technology Inc. and its subsidiaries
DS60001915A - 18
**MCPF1525M06 Electrical Characteristics**
## **3. Electrical Characteristics**
## **3.1. Absolute Maximum Ratings**
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
|**Parameter(s)**|**Symbol**|**Min.**|**Max.**|**Unit**|
|---|---|---|---|---|
|PVIN, VIN, EN to PGND, CB to SW1||−0.3|18|V|
|VCC to PGND(1)||−0.3|6|V|
|SW1, SW2||−0.3|15|V|
|FB, PG and All Other I/O’s to AGND||−0.3|VCC|V|
|PGND to AGND(1)||−0.3|0.3|V|
|Moisture Sensitivity Level||MSL 3 JEDEC J-STD-020D|||
|ESD Classifcation||1.5 kV HBM JESD22-A114|||
## **Note:**
1. PGND and AGND must be connected together.
## **3.2. Recommended Operating Conditions**
|**Parameter(s)**|**Symbol**|**Min.**|**Typ.**|**Max.**|**Unit**|
|---|---|---|---|---|---|
|PVIN Range With External VCC(2)|PVIN|6*VOUT|—|16|V|
|PVIN Range With Internal LDO(3)|PVIN, VIN|6*VOUT|—|16|V|
|Supply Voltage Range(1)|VCC|4.5|—|5.5|V|
|Output Voltage Range|VOUT|0.6|—|1.8|V|
|Continuous Output Current|IO|0|—|25|A|
|Operating Junction Temperature|TJ|−40|—|125|°C|
## **Notes:**
1. Must not exceed 6V.
2. VIN is connected to VCC to bypass the internal LDO regulator.
3. VIN is connected to PVIN (single rail operations with PVIN = VIN = 4.5V to 5.5V).
## **3.3. DC/AC Characteristics**
|**Unless otherwise stated, these specifcations apply for: 6 × VOUT < PVIN < 16V, 4.5V < VIN < 16V, 0°C < TJ < 125°C**|**Unless otherwise stated, these specifcations apply for: 6 × VOUT < PVIN < 16V, 4.5V < VIN < 16V, 0°C < TJ < 125°C**|**Unless otherwise stated, these specifcations apply for: 6 × VOUT < PVIN < 16V, 4.5V < VIN < 16V, 0°C < TJ < 125°C**|**Unless otherwise stated, these specifcations apply for: 6 × VOUT < PVIN < 16V, 4.5V < VIN < 16V, 0°C < TJ < 125°C**|**Unless otherwise stated, these specifcations apply for: 6 × VOUT < PVIN < 16V, 4.5V < VIN < 16V, 0°C < TJ < 125°C**|**Unless otherwise stated, these specifcations apply for: 6 × VOUT < PVIN < 16V, 4.5V < VIN < 16V, 0°C < TJ < 125°C**|**Unless otherwise stated, these specifcations apply for: 6 × VOUT < PVIN < 16V, 4.5V < VIN < 16V, 0°C < TJ < 125°C**|
|---|---|---|---|---|---|---|
|**Parameter(s)**|**Symbol**|**Min.**|**Typ.**|**Max.**|**Unit**|**Conditions**|
|**Supply Current**|||||||
|VIN Supply Current (Standby)|IIN(STANDBY)|7|8.2|9.5|mA|EN low|
|VIN Supply Current (Static)|IIN(STATIC)|8.8|10.5|12.2|mA|EN = 2V, no switching|
|VIN Supply Current (Dynamic)|IIN(DYN)|47|51.5|56|mA|EN high, VIN= 12V, FSW= 625 kHz|
|**Soft-Start**|||||||
|Soft-start Time(1)|SSTIME|2.3|3|3.7|ms|Default, VOUT= 0.6V,<br>TON_RISE= default setting|
|**Output Voltage**|||||||
|Output Voltage|VOUT|—|0.6|—|V|Default|
|Output Voltage Range|VOUT|0.6|—|1.8|V||
Data Sheet
DS60001915A - 19
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Electrical Characteristics**
## **DC/AC Characteristics** (continued)
|**DC/AC Characteristcs**(contnued)|**DC/AC Characteristcs**(contnued)|**DC/AC Characteristcs**(contnued)|**DC/AC Characteristcs**(contnued)|**DC/AC Characteristcs**(contnued)|**DC/AC Characteristcs**(contnued)|**DC/AC Characteristcs**(contnued)|
|---|---|---|---|---|---|---|
|**Unless otherwise stated, these specifcations apply for: 6 × VOUT < PVIN < 16V, 4.5V < VIN < 16V, 0°C < TJ < 125°C**|||||||
|**Parameter(s)**|**Symbol**|**Min.**|**Typ.**|**Max.**|**Unit**|**Conditions**|
|VOUT Resolution|VOUT|—|5|—|mV||
|VOUT Accuracy|VOUT|−0.7|—|+0.7|%|TJ= 25 °C, VOUT= 0.6V(3)|
|||−1.5|—|1.5|%|−40 °C ≤ TJ≤ 105 °C, VOUT= 0.6V(2,3)|
|||−1|—|1|%|TJ= 25 °C, 0.6V ≤ VOUT≤ 1.8V(3)|
|**ON Time**|||||||
|ON Time|tON|155|180|205|ns|VIN= 12V, VOUT= 0.6V, FSW= 625 kHz|
|Minimum ON Time(1)|tON(MIN)|—|50|—|ns||
|Minimum OFF Time|tOFF(MIN)|395|430|465|ns|TJ= 25 °C, FSW= 625 kHz, PVIN= 6V,<br>VIN= VCC= PVCC= 4.5V|
|**Internal LDO Regulator**|||||||
|Output Voltage|VCC|4.9|5.2|5.4|V|5.5V < VIN≤ 16V, 0-75 mA|
|||4|—|—|V|4.5V < VIN≤ 5.5V, 0-55 mA|
|Line Regulation|VLN|0|40|110|mV|5.5V < VIN≤ 16V, 0-75 mA|
|Load Regulation|VLD|0|110|140|mV|0-75 mA|
|Short Circuit Current(1)|ISHORT|130|151|172|mA||
|**Thermal Shutdown**|||||||
|Threshold|TJSD|—|145|—|°C||
|Hysteresis||—|25|—|°C||
|**Undervoltage Lockout**|||||||
|VCC Start Threshold|VCCUVLO(STRT)|4.0|4.2|4.4|V|VCCrising|
|VCC Stop Threshold|VCCUVLO(STOP)|3.6|3.8|4.1|V|VCCfalling|
|EN Threshold Rising|ENHIGH|1.14|1.2|1.36|V|EN rising|
|EN Threshold Falling|ENLOW|0.9|1.0|1.06|V|EN falling|
|EN Input Impedance|REN|0.5|1.0|1.5|MΩ||
|**Current Limit**|||||||
|Default Threshold|IOC(def)|30.5|33|35.5|A|TJ= 25°C, VOUT= 0.6V|
|Hiccup Time|tOC_HIC|—|20|—|ms||
|**Overvoltage**|||||||
|Default Threshold(1)|VOVP(DEF)|110|120|130|%||
|Delay Time|tOVPDLY|—|5|—|μs||
|**Remote Sense Amplifer**|||||||
|Diferential Gain|ADIFF|—|1|—|V/V||
|Input Ofset Voltage|VIOS|—|0|—|mV|RSO= 0.6V, no load|
|Output Sourcing Current|ISRC|—|5.5|—|mA|RS+ = TBS, RS− = 0V, RSO = 1.8V|
|Output Sinking Current|ISNK|—|0.55|—|mA|RS+ = 0V, RS− = −0.5V, RSO = 0.5V|
|**Power Good**|||||||
|Upper Threshold (Default)|VPG(UP)|75|85|95|%|VOUTrising|
|Hysteresis|VPG(LOW)|—|5|—|%|VOUTfalling, diferential to rising<br>threshold|
|PG Sink Current|IPG|6.6|8.8|11|mA|PG = 0.6V, EN = 2V|
|**Telemetry**|||||||
|PVIN Report Accuracy|PVINRPT_ACC|−0.8|—|0.8|%|PVIN= 12V, TJ= 25°C|
|||−1|—|1|%|PVIN= 12V, −40°C ≤ TJ≤ 125°C|
Data Sheet
DS60001915A - 20
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Electrical Characteristics**
## **DC/AC Characteristics** (continued)
|**DC/AC Characteristcs**(contnued)|**DC/AC Characteristcs**(contnued)|**DC/AC Characteristcs**(contnued)|**DC/AC Characteristcs**(contnued)|**DC/AC Characteristcs**(contnued)|**DC/AC Characteristcs**(contnued)|**DC/AC Characteristcs**(contnued)|
|---|---|---|---|---|---|---|
|**Unless otherwise stated, these specifcations apply for: 6 × VOUT < PVIN < 16V, 4.5V < VIN < 16V, 0°C < TJ < 125°C**|||||||
|**Parameter(s)**|**Symbol**|**Min.**|**Typ.**|**Max.**|**Unit**|**Conditions**|
|VOUT Report Accuracy|VOUTRPT_ACC|−2.5|—|2.5|%|VOUT= FB = 0.6V, TJ= 25°C|
|||−3.2|—|3.2|%|VOUT= FB = 0.6V, −40°C ≤ TJ≤ 125°C|
|||−2|—|2|%|0.6V ≤ FB ≤ 1.8V, TJ= 25°C|
|||−2.5|—|2.5|%|0.6V ≤ FB ≤ 1.8V, −40°C < TJ< 125°C|
|IOUT Report Accuracy|IOUTRPT_ACC|0|—|2|A|PVIN= 12V, TJ= 25°C, VOUT= 0.6V,<br>IOUT= 0A|
|||0|—|2.5|A|PVIN= 12V, −40°C ≤ TJ≤ 125°C,<br>VOUT= 0.6V, IOUT= 0A|
|Temperature Report<br>Accuracy(1)|TRPT_ACC|−10|—|10|°C|−40°C < TJ< 125°C|
## **Notes:**
1. Guaranteed by design, not production tested.
2. Performance over temperature guaranteed by correlation using statistical quality control but not tested in production.
3. Closed loop VOUT measurement that includes all tolerances (reference, offsets, remote sense, switching ripple).
## **3.4. I[2] C Interface Electrical Characteristics**
|**Unless otherwise stated, these specifcations apply for: 6 × VOUT < PVIN < 16V, 4.5V < VIN < 16V, 0°C < TJ < 125°C, all**<br>**parameters are guaranteed by design and are not production tested.**|**Unless otherwise stated, these specifcations apply for: 6 × VOUT < PVIN < 16V, 4.5V < VIN < 16V, 0°C < TJ < 125°C, all**<br>**parameters are guaranteed by design and are not production tested.**|**Unless otherwise stated, these specifcations apply for: 6 × VOUT < PVIN < 16V, 4.5V < VIN < 16V, 0°C < TJ < 125°C, all**<br>**parameters are guaranteed by design and are not production tested.**|**Unless otherwise stated, these specifcations apply for: 6 × VOUT < PVIN < 16V, 4.5V < VIN < 16V, 0°C < TJ < 125°C, all**<br>**parameters are guaranteed by design and are not production tested.**|**Unless otherwise stated, these specifcations apply for: 6 × VOUT < PVIN < 16V, 4.5V < VIN < 16V, 0°C < TJ < 125°C, all**<br>**parameters are guaranteed by design and are not production tested.**|**Unless otherwise stated, these specifcations apply for: 6 × VOUT < PVIN < 16V, 4.5V < VIN < 16V, 0°C < TJ < 125°C, all**<br>**parameters are guaranteed by design and are not production tested.**|**Unless otherwise stated, these specifcations apply for: 6 × VOUT < PVIN < 16V, 4.5V < VIN < 16V, 0°C < TJ < 125°C, all**<br>**parameters are guaranteed by design and are not production tested.**|**Unless otherwise stated, these specifcations apply for: 6 × VOUT < PVIN < 16V, 4.5V < VIN < 16V, 0°C < TJ < 125°C, all**<br>**parameters are guaranteed by design and are not production tested.**|
|---|---|---|---|---|---|---|---|
|**Parameter**|**Symbol**|**Fast Mode**||**Fast Mode Plus**||**Unit**|**Conditions**|
|**I2C Paramters**||**Min**|**Max**|**Min**|**Max**|||
|I2C Bus Voltage|VBUS|1.8|5.5|1.8|5.5|V||
|Low Level Input Voltage|VIL|−0.5|0.3VBUS|−0.5|0.3VBUS|V||
|High Level Input Voltage|VIH|0.7VBUS|—|0.7VBUS||V||
|Hysteresis|VHYS|0.05VBUS|—|0.05VBUS||V||
|Low Level Output<br>Voltage 1|VOL1|0|0.4|0|0.4|V|3 mA sink,<br>VBUS> 2V|
|Low Level Output<br>Voltage 2|VOL2|0|0.2VBUS|0|0.2VBUS|V|2 mA sink,<br>VBUS≤ 2V|
|Low Level Output|IOL|3|—|3|—|mA|VOL= 0.4V|
|Current||6|—|6|—|mA|VOL= 0.6V|
|Output Fall Time|tOF|20 × (VBUS/5.5V)|250|20 × (VBUS/5.5V)|125|ns|VIHminto VILmax|
|Pulse Width of<br>Spikes That Must be<br>Suppressed|tSP|0|50|0|50|ns||
|Input Current I/O Pins|IIN|−10|10|−10|10|μA||
|Capacitance I/O Pins|CIN|—|10|—|10|pF||
|SCL Frequency|fSCL|—|400|—|1000|kHz||
|Hold Time (Repeated<br>START)|tHD_ST|0.6|—|0.26|—|μs|First SCL pulse<br>after this time|
|SCL Low Time|tLOW|1.3|—|0.5|—|μs||
|SCL High Time|tHIGH|0.6|—|0.26|—|μs||
|Setup Time (Repeated<br>START)|tSU_ST|0.6|—|0.26|—|μs||
Data Sheet
DS60001915A - 21
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Electrical Characteristics**
## **I2C Interface Electrical Characteristics** (continued)
|**I2C Interface Electrical Characteristcs**(contnued)|**I2C Interface Electrical Characteristcs**(contnued)|**I2C Interface Electrical Characteristcs**(contnued)|**I2C Interface Electrical Characteristcs**(contnued)|**I2C Interface Electrical Characteristcs**(contnued)|**I2C Interface Electrical Characteristcs**(contnued)|**I2C Interface Electrical Characteristcs**(contnued)|**I2C Interface Electrical Characteristcs**(contnued)|
|---|---|---|---|---|---|---|---|
|**Unless otherwise stated, these specifcations apply for: 6 × VOUT < PVIN < 16V, 4.5V < VIN < 16V, 0°C < TJ < 125°C, all**<br>**parameters are guaranteed by design and are not production tested.**||||||||
|**Parameter**|**Symbol**|**Fast Mode**||**Fast Mode Plus**||**Unit**|**Conditions**|
|**I2C Paramters**||**Min**|**Max**|**Min**|**Max**|||
|Data Hold Time|tHD_DAT|0|—|0|—|μs||
|Data Setup Time|tSU_DAT|100|—|50|—|ns||
|SDA, SCL Rise Time|tR|20|300|—|120|ns||
|SDA, SCL Fall Time|tF|20 x (VCC/5.5V)|300|20 x (VCC/5.5V)|120|ns||
|Setup Time for STOP<br>Condition|TSU_STOP|0.6|—|0.26|—|μs||
|Bus Free Time Between<br>STOP and START|tBUF|1.3|—|0.5|—|μs||
|Capacitive Load on a Bus<br>Line|CB|—|400|—|550|pF||
|Data Valid Time|tVD_DAT|—|0.9|—|0.45|μs||
|Data Valid ACK Time|tVD_ACK|—|0.9|—|0.45|μs||
|Noise Margin at Low<br>Level|VNL|0.1VBUS|—|0.1VBUS|—|V|Each device,<br>including<br>|
|Noise Margin at Low<br>Level|VNH|0.2VBUS|—|0.2VBUS|—|V|hysteresis|
|SDA Timeout|tTO|200|—|200|—|μs||
## **Note:**
1. Guaranteed by design, not production tested.
## **3.5. Thermal Characteristics**
|**Parameter(s)**|**Symbol**|**Min.**|**Typ.**|**Max.**|**Unit**|
|---|---|---|---|---|---|
|Junction to Ambient Thermal Resistance|θJA|—|10.5|—|°C/W|
|Junction to PCB Thermal Resistance|θJ-PCB|—|1.4|—|°C/W|
|Storage Temperature|TA|−55|—|150|°C|
|Junction Temperature|TJ|−40|—|150|°C|
## **Notes:**
1. θJA JEDEC JESD 51-2A
2. θJ-PCB JEDEC JESD 51-8
Data Sheet
DS60001915A - 22
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Typical Performance Curves**
## **4. Typical Performance Curves**
The graphs and tables provided in this section are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside the specified power supply range) and therefore outside the warranted range.
**Important:** Unless otherwise stated, test conditions are PVIN = VIN = 12V, VOUT = 0.6V, IOUT = 0A, PS Resistor = 0Ω, and COUT = 10 × 47 µF .
**Figure 4-1.** VOUT vs. Temperature (0.6V)
**Figure 4-2.** VOUT vs. Temperature (0.7V)
**==> picture [506 x 171] intentionally omitted <==**
**----- Start of picture text -----**<br>
0.64 0.74<br>0.63 0.73<br>0.62 0.72<br>0.61 0.71<br>0.6 0.7<br>0.59 0.69<br>0.58 0.68<br>0.57 0.67<br>0.56 0.66<br>-40 -20 0 20 40 60 80 100 120 140 -40 -20 0 20 40 60 80 100 120 140<br>Temperature (°C) Temperature (°C)<br> (V) (V)<br>OUT OUT<br>V V<br>**----- End of picture text -----**<br>
**Figure 4-3.** VOUT vs. Temperature (0.8V)
**Figure 4-4.** VOUT vs. Temperature (0.9V)
**==> picture [506 x 171] intentionally omitted <==**
**----- Start of picture text -----**<br>
0.84 0.94<br>0.83 0.93<br>0.82 0.92<br>0.81 0.91<br>0.8 0.9<br>0.79 0.89<br>0.78 0.88<br>0.77 0.87<br>0.76 0.86<br>-40 -20 0 20 40 60 80 100 120 140 -40 -20 0 20 40 60 80 100 120 140<br>Temperature (°C) Temperature (°C)<br> (V) (V)<br>OUT OUT<br>V V<br>**----- End of picture text -----**<br>
Data Sheet
DS60001915A - 23
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Typical Performance Curves**
**Figure 4-5.** VOUT vs. Temperature (1.0V)
**Figure 4-6.** VOUT vs. Temperature (1.2V)
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**----- Start of picture text -----**<br>
1.04 1.24<br>1.23<br>1.03<br>1.22<br>1.02<br>1.21<br>1.01<br>1.2<br>1 1.19<br>1.18<br>0.99<br>1.17<br>0.98<br>1.16<br>0.97<br>1.15<br>0.96 1.14<br>-40 -20 0 20 40 60 80 100 120 140 -40 -20 0 20 40 60 80 100 120 140<br>Temperature (°C) Temperature (°C)<br>Figure 4-7. VOUT vs. Temperature (1.5V) Figure 4-8. VOUT vs. Temperature (1.8V)<br>1.56 1.86<br>1.84<br>1.54<br>1.82<br>1.52<br>1.8<br>1.5<br>1.78<br>1.48<br>1.76<br>1.46<br>1.74<br>1.44 1.72<br>-40 -20 0 20 40 60 80 100 120 140 -40 -20 0 20 40 60 80 100 120 140<br>Temperature (°C) Temperature (°C)<br> (V) (V)<br>OUT OUT<br>V V<br> (V) (V)<br>OUT OUT<br>V V<br>**----- End of picture text -----**<br>
**Figure 4-9.** EN Start Threshold vs. Temperature
**Figure 4-10.** EN Stop Threshold vs. Temperature
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1.24 1.02<br>1.23 1.01<br>1.22 1<br>1.21 0.99<br>1.2 0.98<br>1.19 0.97<br>1.18 0.96<br>1.17 0.95<br>1.16 0.94<br>1.15 0.93<br>1.14 0.92<br>-40 -20 0 20 40 60 80 100 120 140 -40 -20 0 20 40 60 80 100 120 140<br>Temperature (°C) Temperature (°C)<br>EN Stop Threshold (V)<br>EN Start Threshold (V)<br>**----- End of picture text -----**<br>
Data Sheet
DS60001915A - 24
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Typical Performance Curves**
**Figure 4-11.** VCC Start Threshold vs. Temperature
**Figure 4-12.** VCC Stop Threshold vs. Temperature
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4.35 3.95<br>4.3 3.9<br>4.25 3.85<br>4.2 3.8<br>4.15 3.75<br>4.1 3.7<br>4.05 3.65<br>4 3.6<br>-40 -20 0 20 40 60 80 100 120 140 -40 -20 0 20 40 60 80 100 120 140<br>Temperature (°C) Temperature (°C)<br>Figure 4-13. tON vs. Temperature (VOUT = 0.6V, IOUT = 0) Figure 4-14. tOFF vs. Temperature (PVIN = 6V, VIN = VCC = PVCC<br>= 4.5V)<br>220 480<br>470<br>210<br>460<br>200<br>450<br>190<br>440<br>180 430<br>420<br>170<br>410<br>160<br>400<br>150<br>390<br>140 380<br>-40 -20 0 20 40 60 80 100 120 140 -40 -20 0 20 40 60 80 100 120 140<br>Temperature (°C) Temperature (°C)<br>VCC Start Threshold (V) VCC Stop Threshold (V)<br> (ns) (ns)<br>tON tOFF<br>**----- End of picture text -----**<br>
**Figure 4-15.** Soft Start Time vs. Temperature
**Figure 4-16.** VIN Dynamic Input Current vs. Temperature
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4 56<br>3.8 55<br>3.6 54<br>3.4 53<br>3.2 52<br>3 51<br>2.8 50<br>2.6 49<br>2.4 48<br>2.2 47<br>2 46<br>-40 -20 0 20 40 60 80 100 120 140 -40 -20 0 20 40 60 80 100 120 140<br>Temperature (°C) Temperature (°C)<br>Soft Start Time (ms) Dynamic Current (mA)<br>IN<br>V<br>**----- End of picture text -----**<br>
Data Sheet
DS60001915A - 25
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Typical Performance Curves**
**Figure 4-17.** Overcurrent Threshold vs. Temperature
**Figure 4-18.** Switching Frequency vs. Temperature
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38 680<br>37<br>ee 660 ee<br>36 P| ee ee<br>35 A | [| | | | ff<br>OG 640<br>34<br>33 620<br>poet | | Pt oe |_|<br>32<br>31 pfa eejfpeeeeft ty) 600 | tt | | rr<br>30 a eee<br>580<br>29<br>28 P|+| | | | [|EEft fy UE 560 EEE EE<br>-40 -20 0 20 40 60 80 100 120 140 -40 -20 0 20 40 60 80 100 120 140<br>Temperature (°C) Temperature (°C)<br>Overcurrent Threshold (A) Switching Frequency (kHz)<br>**----- End of picture text -----**<br>
**Figure 4-19.** Nominal Switching Waveforms (PVIN = 12V, VOUT = 0.6V, IOUT = 0A)
**Figure 4-20.** Nominal Switching Waveforms (PVIN = 12V, VOUT = 0.6V, IOUT = 25A)
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C1: 2V/div C1: 2V/div<br>C2: 2V/div 1 μs/div C2: 2V/div 1 μs/div<br>**----- End of picture text -----**<br>
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Figure 4-21. Output Ripple (PVIN = 12V, VOUT = 0.6V, IOUT = 0A) Figure 4-22. Output Ripple (PVIN = 12V, VOUT = 0.6V, IOUT =<br>25A)<br>C1: 10 mV/div<br>C1: 10 mV/div<br>1 μs/div<br>1 μs/div<br>Scccccsss=pesseeEs<br>**----- End of picture text -----**<br>
Data Sheet
DS60001915A - 26
© 2026 Microchip Technology Inc. and its subsidiaries ~~X~~ MicrRocHIP
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Typical Performance Curves**
**Figure 4-23.** Transient (IOUT = 3A to 20A, PVIN = 12V, VOUT = 600 mV)
**Figure 4-24.** Transient (IOUT = 20A to 3A, PVIN = 12V, VOUT = 600 mV)
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C1: 10 mV/div<br>C4: 5A/div<br>50 μs/div<br>**----- End of picture text -----**<br>
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C1: 10 mV/div<br>C4: 5A/div<br>50 μs/div<br>**----- End of picture text -----**<br>
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Figure 4-25. Transient (IOUT = 3A to 20A, PVIN = 12V, VOUT = Figure 4-26. Transient (IOUT = 20A to 3A, PVIN = 12V, VOUT =<br>1V) 1V)<br>C1: 10 mV/div C1: 10 mV/div<br>C4: 5A/div<br>C4: 5A/div<br>50 μs/div 50 μs/div<br>eee rooeeeeeiteaes<br>Figure 4-27. Startup (PVIN = 12V, VOUT = 0.6V, IOUT = 0A) Figure 4-28. Startup (PVIN = 12V, VOUT = 0.6V, IOUT = 16A)<br>VOUT: 200 mV/div VOUT: 200 mV/div<br>PVIN: 5V/div PVIN: 5V/div<br>EN: 1V/div EN: 1V/div<br>PG: 5V/div 2 ms/div PG: 5V/div 2 ms/div<br>**----- End of picture text -----**<br>
Data Sheet
DS60001915A - 27
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Typical Performance Curves**
**Figure 4-29.** Startup (VOUT = 12V to 1V, IOUT = 0A)
**Figure 4-30.** Startup (VOUT = 12V to 1V, IOUT = 16A)
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VOUT: 200 mV/div VOUT: 200 mV/div<br>PVIN: 5V/div PVIN: 5V/div<br>EN: 1V/div EN: 1V/div<br>PG: 5V/div PG: 5V/div<br>SSS RES SESS EES<br>2 ms/div 2 ms/div<br>**----- End of picture text -----**<br>
**Figure 4-31.** Shutdown via EN (VOUT = 12 V to 600 mV, IOUT = 0A)
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PVIN: 5V/div<br>VOUT: 200 mV/div<br>EN: 5V/div<br>2 s/div PG: 5V/div<br>**----- End of picture text -----**<br>
**Figure 4-32.** Efficiency vs. Load
**Figure 4-33.** Power Loss vs. Load
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5<br>90%<br>4.5<br>85% .)dea———— 4 eee,<br>80% 3.5<br>75% 3<br>7 (Ga ee eg<br>2.5<br>70%<br>2<br>65%<br>2oe VOUT = 12V to 800 mV 1.5 ee VOUT = 12V to 800 mV<br>60% VOUT = 12V to 1V 1 VOUT = 12V to 1V<br>VOUT = 12V to 1.2V VOUT = 12V to 1.2V<br>55%<br>fs VOUT = 12V to 1.5V = 0.5 VOUT = 12V to 1.5V<br>50% 0<br>0 5 10 15 20 25 0 5 10 15 20 25<br>Load (A) Load (A)<br>Efficiency<br>Power Loss (W)<br>**----- End of picture text -----**<br>
Data Sheet
DS60001915A - 28
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Typical Performance Curves**
**Figure 4-34.** Load Regulation vs. Load (VOUT = 12V to 800 mV)
**Figure 4-35.** Load Regulation vs. Load (VOUT = 12V to 1V)
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0.15%<br>0.20%<br>0.10%<br>0.15%<br>0.05%<br>0.10%<br>0.05% 0.00%<br>0.00% -0.05%<br>-0.05%<br>-0.10%<br>-0.10%<br>-0.15%<br>0 5 10 15 20 25<br>-0.15%<br>0 5 10 15 20 25 Load (A)<br>Load (A)<br>Figure 4-36. Load Regulation vs. Load (VOUT = 12V to 1.2V) Figure 4-37. Load Regulation vs. Load (VOUT = 12V to 1.5V)<br>0.15% 0.15%<br>0.10%<br>0.10%<br>0.05%<br>0.05%<br>0.00%<br>0.00%<br>-0.05%<br>-0.05%<br>-0.10%<br>-0.15% -0.10%<br>0 5 10 15 20 25 0 5 10 15 20 25<br>Load (A) Load (A)<br>Load Regulation<br>Load Regulation<br>Load Regulation Load Regulation<br>**----- End of picture text -----**<br>
Data Sheet © 2026 Microchip Technology Inc. and its subsidiaries
DS60001915A - 29
**MCPF1525M06 Application Information**
## **5. Application Information**
## **5.1. Design Example**
For this example, the specifications are:
- PVIN = VIN = 12V
- VOUT = 0.8V
- IOUT = 25A
- fSW = 625 kHz
- Ripple Voltage = ±1% × VOUT
- ΔVOUT(MAX) = ±3% × VOUT (for 6A load transient @ 4 A/μs)
## **5.2. Input Capacitor**
The input capacitor chosen for this design must:
- Accommodate the peak and RMS input currents required by the MCPF1525M06
- Possess low equivalent series resistance (ESR) and inductance (ESL) to minimize input voltage disturbances
MLCCs (multi-layer ceramic capacitors) are ideal for this purpose. Typically, in an 0805 case size, they can handle 2A RMS current with less than a 5°C temperature rise. For the MCPF1525M06 converter topology operating at duty cycle D and output current (IOUT), the RMS value of the input current is:
IRMS = 0.5 × IOUT × D × 1 −D
In this application, IOUT is 25A and D is 2 × VOUT/VIN (aggregate duty for a 2-phase converter) or 0.133. Thus, the input capacitor IRMS is 4.25A, so we can choose at least three such capacitors. For this design, four 22 μF, 25V ceramic capacitors are used as the input capacitors (C2012JB1V226M125AC from TDK). If the MCPF1525M06 is not positioned near the 12V power supply, an additional bulk capacitor (68–330 μF) may be used alongside the ceramic capacitors.
For VIN, which serves as the input to the LDO, it is recommended to place a 1 μF capacitor very close to the pin. The VIN pin should be connected to PVIN via a 2.7Ω resistor to help filter noise on PVIN.
## **5.3. Output Voltage and Output Capacitor**
The MCPF1525M06 is factory-calibrated to deliver a 0.6V output in a closed-loop configuration. When opting for a resistor divider instead of using I[2] C/PMBus[™] , as illustrated in this application example, resistor values should be selected based on the guidelines provided in Section ‘Soft-Start and Target Output Voltage’. Consequently, RTOP is set to 1 kΩ, RBOTTOM to 3.24 kΩ, and CFF to 2.7 nF.
This design uses the TDK C2012X5R1A476M125AC, a 47 μF MLCC with an 0805 case size and a 10V rating. Considering DC bias and AC ripple derating at 0.8V, its equivalent capacitance is approximately 42 μF. The equivalent series resistance (ESR) is 3 mΩ, and the equivalent series inductance (ESL) is 0.44 nH.
## **5.4.**
## **VCC and PVCC Capacitors**
The MCPF1525M06 incorporates on-package capacitors for both VCC and PVCC to ensure efficient high-frequency bypassing. However, for applications utilizing an external VCC supply, it is advisable for system designers to place 2.2 μF/0603/X7R/10V capacitors on the application board as close as possible to the VCC and PVCC pins (see Figure 5-1).
## **5.5. PS Pin Resistance**
This pin selects the operating mode for the device. Since this is a stand-alone device and will be using a voltage divider to set the output voltage, a 0Ω resistor is connected from the PS pin
Data Sheet
DS60001915A - 30
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Application Information**
to AGND. Alternatively, an 11 kΩ resistor could be used here and the RSO pin could be directly connected to the FB pin with no divider. See Table 2-3.
## **5.6. EN Pin Divider**
A voltage divider is placed on the EN pin, which is connected to the PVIN pin. This provides a programmable UVLO circuit for the start of power conversion. The turn-on threshold for this pin is 1.2V typical. If the turn-on threshold is set to 6V and the top side resistor (REN1) is selected as 49.9 kΩ, the bottom resistor (REN2) can be calculated as follows:
**==> picture [157 x 26] intentionally omitted <==**
Where:
- REN1 and REN2 are the voltage divider resistors on the EN pin
- VEN_high is the turn on threshold of the EN pin (from the Electrical Characteristics table)
- VPVIN_on is the desired PVIN voltage when the device will start power conversion
- Using the values mentioned, we select REN2 to be 12.7 kΩ.
**Figure 5-1.** Design Example
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CCB<br>CB SW1<br>PVIN PVIN VOUT VOUT<br>CIN COUT<br>RVIN RS+<br>VIN RS-<br>CVIN MCPF1525M06<br>REN1<br>EN PVIN<br>RSO PS<br>RPS REN2<br>CFF FB<br>RFBBOT AGND VCC PVCC PGND<br>CVCC CPVCC<br>**----- End of picture text -----**<br>
**Table 5-1.** Final Design:
|**Component**|**Value**||**Component**|**Value**|
|---|---|---|---|---|
|CIN|4 × 22 μF||RVIN|2.7Ω|
|CVIN|1 μF||RFBTOP|1 kΩ|
|CFF|2.7 nF||RFBBOT|3.16 kΩ|
|CVCC|2.2 μF||RPS|0Ω|
|CPVCC|2.2 μF||REN1|49.9 kΩ|
|COUT|10 × 47 μF||REN2|12.7 kΩ|
|CCB|2 × 4.7 μF||||
Data Sheet
DS60001915A - 31
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Layout Recommendations**
## **6. Layout Recommendations**
## **General**
The MCPF1525M06 is a highly integrated device that requires minimal external components, making PCB layout straightforward. To ensure optimal performance, follow these general PCB design recommendations:
- Position capacitors and feedback sensing components as close as possible to their corresponding MCPF1525M06's pins.
- Place at least two input capacitors on the top PCB layer, with any additional input capacitors on the bottom layer.
- Install at least two output capacitors on the top layer; any remaining output capacitors can be placed on either the top or bottom layer.
- Mount coupling capacitors between the CB and SW1 pins on the top layer, ensuring robust metal connections.
- Locate coupling capacitors near the VIN, VCC, and PVCC pins, either on the top or bottom layer.
- Use as many decoupling vias as possible on the PVIN, VOUT, PGND, and AGND pins, preferably using vias in pads plated over (VIPPO).
- Place at least two vias adjacent to the PGND and VOUT terminals of each input and output coupling capacitor.
- Route the VOUT remote sensing traces as a differential pair to the load regulation point, ensuring they are positioned away from sources of electrical noise.
## **Thermal**
The MCPF1525M06 has undergone thermal testing and modeling in compliance with JEDEC standards JESD 51-2A and JESD 51-8. Testing was conducted using a 4-layer application PCB equipped with thermal vias beneath the device to enhance cooling.
The MCPF1525M06 has two main heat sources:
- The power MOSFET section of the IC
- The inductor
The IC is effectively coupled to the PCB, which serves as its primary cooling pathway. While the inductor is also connected to the PCB, its main cooling mechanism is through convection. Ultimately, both heat sources dissipate heat through convection. The PCB functions as a heat spreader and, to some extent, a heat sink.
Data Sheet
DS60001915A - 32
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Layout Recommendations**
**Figure 6-1.** Heat Sources in the MCPF1525M06
Inductor thermal path
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INDUCTOR<br>IC<br>IC thermal path<br>**----- End of picture text -----**<br>
**Figure 6-2.** Thermal Resistances Components of the MCPF1525M06 Model
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Junction to case<br>(top) Top to ambient<br>Θ JCtop Θ topA<br>(low contribution) (low contribution)<br>Junction Ambient<br>Junction to case Bottom to PCB PCB to ambient<br>(bottom) (solder) (PCB)<br>Θ JCbottom<br>MCPF1525 device External Factors<br>**----- End of picture text -----**<br>
Figure 6-2 illustrates the thermal resistances in the MCPF1525M06, described as follows:
- ϴJA represents the natural convection from the assembled test sample within a confined enclosure of approximately 30 × 30 × 30 cm. The air in this environment is passive, with movement solely due to convection from the device under test.
- ϴJCbottom indicates the heat flow from the IC to the bottom of the package, where it is wellcoupled. The testing method follows JESD 51-8 guidelines, with the test PCB clamped between cold plates at specified distances from the device.
- ϴJCtop theoretically represents the heat flow from the IC to the top of the package. However, this is not applicable for the MCPF1525M06 for two reasons: it is not the primary conduction path of the IC, and the inductor, which generates a similar amount of heat as the IC, is positioned directly over it. Therefore, a meaningful junction-to-case (top) value cannot be determined.
The thermal resistance values are as follows:
- ϴ = 10.5°C/W JA
- ϴ = 1.4°C/W JCbottom
Data Sheet
DS60001915A - 33
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Layout Recommendations**
While these values provide a comparison of the MCPF1525M06 with similar POL products under identical conditions and specifications, they are not sufficient for predicting overall thermal performance. Precise modeling of the module’s interaction with its environment requires Computational Fluid Dynamics (CFD) simulation software to simultaneously calculate the combined effects of conduction and convection heat transfer paths.
**Tip:** All tests assumed passive or static airflow; applications using forced airflow may achieve better cooling.
## **Footprint Considerations**
The MCPF1525M06 package is compatible with standard surface-mount component techniques. The pads on the bottom of the package are raised slightly above (25 μm) the substrate and are ENEPIG (Electroless Nickel Electroless Palladium Immersion Gold) finished. The package wets well and is suited for lead-free processes. Pads on the board should either be the same size as or slightly larger than the pads on the part substrate.
For best results, it is suggested that the PGND and PVIN pads be connected to inner copper layers using filled vias, micro-vias, or intrusive reflow. This allows the PCB to conduct heat away from the part. The smaller PVIN and PGND pads on the periphery of the part should be connected to the grouped pads beneath the part, as shown in Figure 6-3. These smaller pads are not connected inside the device. Figure 6-4 shows footprint, PCB pad, and solder mask dimensions and outline. Note the solder mask dam between the inner and periphery pads.
**Figure 6-3.** Pad Grouping and Common Connections
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SW1<br>CB<br>PGND<br>PVIN<br>AGND<br>VOUT2 VOUT1<br>**----- End of picture text -----**<br>
Data Sheet
DS60001915A - 34
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Layout Recommendations**
## **Figure 6-4.** Relative Device Footprint, PCB Pad, and Solder Mask Guidelines
Solder mask dam is important (typical)
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Data Sheet
DS60001915A - 35
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **7. PMBus Commands**
**Table 7-1.** PMBus Commands List
|**No. **|**Name**|**Adr.**|**No. **|**Name**|**Adr.**|**No. **|**Name**|**Adr.**|
|---|---|---|---|---|---|---|---|---|
|1|OPERATION|0x01|20|VOUT_OV_WARN_LIMIT|0x42|39|TOFF_FALL|0x65|
|2|ON_OFF_CONFIG|0x02|21|VOUT_UV_WARN_LIMIT|0x43|40|STATUS_BYTE|0x78|
|3|CLEAR_FAULTS|0x03|22|VOUT_UV_FAULT_LIMIT|0x44|41|STATUS_WORD|0x79|
|4|WRITE_PROTECT|0x10|23|VOUT_UV_FAULT_RESPONSE|0x45|42|STATUS_VOUT|0x7A|
|5|STORE_USER_ALL|0x15|24|IOUT_OC_FAULT_LIMIT|0x46|43|STATUS_IOUT|0x7B|
|6|RESTORE_USER_ALL|0x16|25|IOUT_OC_FAULT_RESPONSE|0x47|44|STATUS_INPUT|0x7C|
|7|CAPABILITY|0x19|26|IOUT_OC_WARN_LIMIT|0x4A|45|STATUS_TEMPERATURE|0x7D|
|8|SMBALERT_MASK|0x1B|27|OT_FAULT_LIMIT|0x4F|46|STATUS_CML|0x7E|
|9|VOUT_MODE|0x20|28|OT_FAULT_RESPONSE|0x50|47|READ_VIN|0x88|
|10|VOUT_COMMAND|0x21|29|OT_WARN_LIMIT|0x51|48|READ_VOUT|0x8B|
|11|VOUT_MAX|0x24|30|VIN_OV_FAULT_LIMIT|0x55|49|READ_IOUT|0x8C|
|12|VOUT_MARGIN_HIGH|0x25|31|VIN_OV_FAULT_RESPONSE|0x56|50|READ_TEMPERATURE|0x8D|
|13|VOUT_MARGIN_LOW|0x26|32|VIN_UV_WARN_LIMIT|0x58|51|PMBUS_REVISION|0x98|
|14|VOUT_TRANSITION_RATE|0x27|33|POWER_GOOD_ON|0x5E|52|MFR_ID|0x99|
|15|VIN_ON|0x35|34|TON_DELAY|0x60|53|MFR_MODEL|0x9A|
|16|VIN_OFF|0x36|35|TON_RISE|0x61|54|MFR_REVISION|0x9B|
|17|IOUT_CAL_OFFSET|0x39|36|TON_MAX_FAULT_LIMIT|0x62|55|IC_DEVICE_ID|0xAD|
|18|VOUT_OV_FAULT_LIMIT|0x40|37|TON_MAX_FAULT_RESPONSE|0x63|56|IC_DEVICE_REV|0xAE|
|19|VOUT_OV_FAULT_RESPONSE|0x41|38|TOFF_DELAY|0x64||||
Data Sheet © 2026 Microchip Technology Inc. and its subsidiaries
DS60001915A - 36
**MCPF1525M06 PMBus Commands**
## **OPERATION (0x01)**
The OPERATION command is used to turn the device output ON or OFF. It is also used to set the output voltage to the upper or lower MARGIN voltages.
|Command|Operation|Operation|Operation|Operation|Operation|Operation|Operation|Operation|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|1|0|0|0|0|0|0|0|
Bit [7]: Controls if PMBus device output is ON or OFF
- 0 : Output is OFF
- 1 : Output is ON
Bit [6]: Controls the power down behavior
- 0 : Output is turned OFF immediately.
- 1 : The device is powered down following the values set in the TOFF_DELAY and TOFF_FALL commands.
Bit [5:4]: Voltage command source
- 00 : The nominal output voltage is set by the PMBus VOUT_COMMAND data
- 01 : The nominal output voltage is set by the PMBus VOUT_MARGIN_LOW data
- 10 : The nominal output voltage is set by the PMBus VOUT_MARGIN_HIGH data
- 11 : AVS Bus (AVS Bus not supported)
Bit [3:2]: Margin fault response
- 00 : Invalid
- 01 : The faults caused by VOUT_MARGIN_HIGH or VOUT_MARGIN_LOW are ignored
- 10 : The faults caused by VOUT_MARGIN_HIGH or VOUT_MARGIN_LOW are acted upon
- 11 : Invalid
Bit [1]: Transition control (AVS Bus not implemented)
Bit [0]: Reserved
Data Sheet
DS60001915A - 37
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **ON_OFF_CONFIG (0x02)**
|Command|ON_OFF_CONFIG|ON_OFF_CONFIG|ON_OFF_CONFIG|ON_OFF_CONFIG|ON_OFF_CONFIG|ON_OFF_CONFIG|ON_OFF_CONFIG|ON_OFF_CONFIG|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|1|1|1|1|1|
Bit [7:5]: Reserved
Bit [4]: Sets the default to either operate when power is present or for the ON/OFF to be controlled by serial bus commands
- 0 : Device powers up when the power is present
- 1 : Device does not power up until commanded by the OPERATION command
Bit [3]: Controls how the unit responds to commands received via the serial bus
- 0 : Device ignores the ON/OFF portion of the OPERATION command from serial bus
- 1 : Device requires the ON/OFF portion of the OPERATION command
Bit [2]: Controls how the unit responds to the EN pin
- 0 : Unit ignores the EN pin (ON/OFF controlled only the OPERATION command)
- 1 : Unit requires the EN pin to be asserted to start the unit
Bit [1]: Polarity of the EN pin
- 0 : Active low
- 1 : Active high
Bit [0]: EN pin action
- 0 : Use the programmed turn OFF delay and fall time
- 1 : Turn OFF the output and stop transferring energy to the output as fast as possible
## **CLEAR_FAULTS (0x03)**
The CLEAR_FAULTS command is used to clear any fault bits that have been set. This command clears all bits in all status registers simultaneously. At the same time, the device releases its SMBALERT signal output if the device is asserting the SMBALERT signal. The CLEAR_FAULTS command does not cause a unit that has latched off for a fault condition to restart. If the fault is still present when the bit is cleared, the fault bit is immediately reset and the host notified by the usual means.
Data Sheet
DS60001915A - 38
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **WRITE_PROTECT (0x10)**
|Command|WRITE_PROTECT|WRITE_PROTECT|WRITE_PROTECT|WRITE_PROTECT|WRITE_PROTECT|WRITE_PROTECT|WRITE_PROTECT|WRITE_PROTECT|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|0|0|0|0|0|
Bit [7]: Control writing to the PMBus device for protection against accidental changes
- 0 : Enable all writes as permitted in bit 5 or bit 6
- 1 : Disable all writes except the WRITE_PROTECT command (bit 5 and bit 6 must be 0)
Bit [6]: Control writing to the PMBus device for protection against accidental changes
• 0 : Enable all writes as permitted in bit 5 or bit 7
• 1 : Disable all writes except for the WRITE_PROTECT, and OPERATION commands (bit 5 and bit 7 must be 0)
Bit [5]: Control writing to the PMBus device for protection against accidental changes
• 0 : Enable all writes as permitted in bit 6 or bit 7
• 1 : Disable all writes except the WRITE_PROTECT, OPERATION, ON_OFF_CONFIG, and VOUT_COMMAND (bit 6 and bit 7 must be 0)
Bit [4:0]: Reserved
## **STORE_USER_ALL (0x15)**
The STORE_USER_ALL command stores all of the current storable register settings in the EEPROM memory as the new defaults on power up. It is permissible to use this command while the device is switching. To use this command:
1. Set all settings to the desired power up configuration.
2. Pull EN low to disable switching.
3. Apply 7.5 ± 0.25V to the VIN pin.
4. Execute the command.
5. Execute a RESTORE_USRE_ALL command.
6. Compare the settings in the part values with the expected settings. If they differ, repeat this procedure. If the settings differ a second time, discard the part.
## **RESTORE_USER_ALL (0x16)**
The RESTORE_USER_ALL command restores all of the storable register settings from EEPROM memory to those registers which are unprotected. This command should not be used while the part is converting power.
Data Sheet
DS60001915A - 39
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **CAPABILITY (0x19)**
|Command|CAPABILITY|CAPABILITY|CAPABILITY|CAPABILITY|CAPABILITY|CAPABILITY|CAPABILITY|CAPABILITY|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R|R|R|R|R|R|R|R|
|Default|0|0|1|1|0|0|0|0|
Bit [7]: Packet Error Checking
• 0 : Packet Error Checking is not supported
Bit [6:5]: Maximum Bus Speed
• 01 : Maximum supported bus speed is 400 kHz
Bit [4]: SMBALERT#
• 1 : The SMBus Alert Response protocol is supported
Bit [3]: Numeric Format
• 0 : Numeric data is in LINEAR11, ULINEAR16, SLINEAR16
Bit [2]: AVSBus Support
• 0 : AVSBus not supported
Bit [1:0]: Reserved
## **SMBALERT_MASK (0x1B)**
The SMBALERT_MASK command may be used to prevent a warning or fault condition from asserting the SMBALERT# signal. The bits in the mask byte align with the bits in the corresponding status register. For example if the STATUS_TEMPERATURE command code were sent with the mask byte 01000000b, then an Overtemperature Warning condition would be blocked from asserting SMBALERT#. This command cannot be used with STATUS_BYTE or STATUS_WORD. Since these commands are the logical or of underlying status registers, use the underlying status commands as the status command code sent to set a mask value. The access mode is a write word transaction for the write and a block write block read transaction for reading. Refer to the SMBus specification for details on this transaction.
## **VOUT_MODE (0x20)**
The data byte for the VOUT_MODE command is one byte that consists of bit [7:5] as Mode and bit[4:0] as Exponent Parameter. The three-bit Mode sets whether the device uses the ULINEAR16, Half-precision IEEE 754 floating point, VID or DIRECT modes for output voltage related commands. The five-bit Parameter provides more information about the selected mode.
|Command|VOUT_MODE|VOUT_MODE|VOUT_MODE|VOUT_MODE|VOUT_MODE|VOUT_MODE|VOUT_MODE|VOUT_MODE|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R|R|R|R|R|R|R|R|
|Default|1|0|0|1|0|1|1|0|
Bit [7]: Data type
- 1 : Device supports relative mode
Bit [6:5]: Data type
- 00 : Five bit two’s complement exponent for the mantissa delivered as the data bytes for an output voltage related command
Bit [4:0]: Exponent parameter in two’s complement
- 10110: value of -10
Data Sheet
DS60001915A - 40
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **VOUT_COMMAND (0x21)**
The VOUT_COMMAND command sets the output voltage in volts
|Command|VOUT_COMMAND|VOUT_COMMAND|VOUT_COMMAND|VOUT_COMMAND|VOUT_COMMAND|VOUT_COMMAND|VOUT_COMMAND|VOUT_COMMAND|VOUT_COMMAND|VOUT_COMMAND|VOUT_COMMAND|VOUT_COMMAND|VOUT_COMMAND|VOUT_COMMAND|VOUT_COMMAND|VOUT_COMMAND|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 16 format||||||||||||||||
|Default|0|0|0|0|0|0|1|0|0|1|1|0|0|1|1|0|
Bit [15:0]: Two linear16 data bytes
Note that this part does not use VOUT_SCALE_LOOP. The value provided via the VOUT_COMMAND command is the voltage that the part will regulate the FB pin to. Any voltage divider used on that pin will need to be accounted for by the user when using VOUT_COMMAND.
The default value is 0.5996 (rounded).
## **VOUT_MAX (0x24)**
The VOUT_MAX command sets the maximum output voltage. The purpose is to protect the devices on the output rail supplied by this device from a higher than acceptable output voltage.
|Command|VOUT_MAX|VOUT_MAX|VOUT_MAX|VOUT_MAX|VOUT_MAX|VOUT_MAX|VOUT_MAX|VOUT_MAX|VOUT_MAX|VOUT_MAX|VOUT_MAX|VOUT_MAX|VOUT_MAX|VOUT_MAX|VOUT_MAX|VOUT_MAX|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 16 format||||||||||||||||
|Default|0|0|0|0|1|0|0|0|0|0|0|0|0|0|0|0|
Bit [15:0]: Two linear16 data bytes
The default value is 2.
## **VOUT_MARGIN_HIGH (0x25)**
This VOUT_MARGIN_HIGH command loads the unit with the voltage to which the output is to be changed when the OPERATION command is set to “Margin High.”
|Command|VOUT_MARGIN_HIGH|VOUT_MARGIN_HIGH|VOUT_MARGIN_HIGH|VOUT_MARGIN_HIGH|VOUT_MARGIN_HIGH|VOUT_MARGIN_HIGH|VOUT_MARGIN_HIGH|VOUT_MARGIN_HIGH|VOUT_MARGIN_HIGH|VOUT_MARGIN_HIGH|VOUT_MARGIN_HIGH|VOUT_MARGIN_HIGH|VOUT_MARGIN_HIGH|VOUT_MARGIN_HIGH|VOUT_MARGIN_HIGH|VOUT_MARGIN_HIGH|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 16 relative format||||||||||||||||
|Default|0|0|0|0|0|1|0|0|0|1|1|0|0|1|1|0|
Bit [15:0]: Two linear16 data bytes
The default value is 1.0996 (rounded).
## **VOUT_MARGIN_LOW (0x26)**
This VOUT_MARGIN_LOW command loads the unit with the voltage to which the output is to be changed when the OPERATION command is set to “Margin Low.”
|Command|VOUT_MARGIN_LOW|VOUT_MARGIN_LOW|VOUT_MARGIN_LOW|VOUT_MARGIN_LOW|VOUT_MARGIN_LOW|VOUT_MARGIN_LOW|VOUT_MARGIN_LOW|VOUT_MARGIN_LOW|VOUT_MARGIN_LOW|VOUT_MARGIN_LOW|VOUT_MARGIN_LOW|VOUT_MARGIN_LOW|VOUT_MARGIN_LOW|VOUT_MARGIN_LOW|VOUT_MARGIN_LOW|VOUT_MARGIN_LOW|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 16 relative format||||||||||||||||
|Default|0|0|0|0|0|0|1|1|1|0|0|1|1|0|0|1|
Bit [15:0]: Two linear16 data bytes
The default value is 0.8994 (rounded).
Data Sheet
DS60001915A - 41
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **VOUT_TRANSITION_RATE (0x27)**
VOUT_TRANSITION_RATE command sets the rate in mV/μs at which the output should change voltage.
|<br>voltage.|||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Command|VOUT_TRANSITION_RATE||||||||||||||||
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 11 format||||||||||||||||
|Default|1|1|1|1|0|0|0|0|0|0|0|0|0|0|0|1|
Bits [15:11]: A 5 bit, two’s complement exponent for the calculation, fixed at –2
Bits [10:0]: An 11 bit, two’s complement mantissa for the calculation
Valid range: 0 to 31.75 V/ms
The default value 0.25 V/ms.
## **VIN_ON (0x35)**
The VIN_ON command sets the value of the input voltage, in volts, at which the unit should start power conversion.
|Command|VIN_ON|VIN_ON|VIN_ON|VIN_ON|VIN_ON|VIN_ON|VIN_ON|VIN_ON|VIN_ON|VIN_ON|VIN_ON|VIN_ON|VIN_ON|VIN_ON|VIN_ON|VIN_ON|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 11 format||||||||||||||||
|Default|1|1|1|1|1|0|0|0|0|0|0|0|0|1|1|0|
Bits [15:11]: A 5 bit, two’s complement exponent for the calculation, fixed at –1
Bits [10:0]: An 11 bit, two’s complement mantissa for the calculation
Valid range: 0 to 15.5V
The default value is 3V.
## **VIN_OFF (0x36)**
The VIN_OFF command sets the value of the input voltage, in Volts, at which the unit, once operation has started, should stop power conversion.
|Command|VIN_OFF|VIN_OFF|VIN_OFF|VIN_OFF|VIN_OFF|VIN_OFF|VIN_OFF|VIN_OFF|VIN_OFF|VIN_OFF|VIN_OFF|VIN_OFF|VIN_OFF|VIN_OFF|VIN_OFF|VIN_OFF|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 11 format||||||||||||||||
|Default|1|1|1|1|1|0|0|0|0|0|0|0|0|1|0|0|
Bits [15:11]: A 5 bit, two’s complement exponent for the calculation, fixed at –1
Bits [10:0]: An 11 bit, two’s complement mantissa for the calculation
Valid range: 0 to 15.5V
The default value is 2V.
Data Sheet
DS60001915A - 42
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **IOUT_CAL_OFFSET (0x39)**
The IOUT_CAL_OFFSET command provides an offset adjustment for the READ_IOUT command. This allows the user to compensate for an offset in the circuit that measures the output current.
|Command|IOUT_CAL_OFFSET|IOUT_CAL_OFFSET|IOUT_CAL_OFFSET|IOUT_CAL_OFFSET|IOUT_CAL_OFFSET|IOUT_CAL_OFFSET|IOUT_CAL_OFFSET|IOUT_CAL_OFFSET|IOUT_CAL_OFFSET|IOUT_CAL_OFFSET|IOUT_CAL_OFFSET|IOUT_CAL_OFFSET|IOUT_CAL_OFFSET|IOUT_CAL_OFFSET|IOUT_CAL_OFFSET|IOUT_CAL_OFFSET|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 11 format||||||||||||||||
|Default|1|1|1|0|0|0|0|0|0|0|0|0|0|0|0|0|
Bits [15:11]: A 5 bit, two’s complement exponent for the calculation, fixed at –4
Bits [10:0]: An 11 bit, two’s complement mantissa for the calculation
Valid range: –8A to 8A
The default value is 0A.
## **VOUT_OV_FAULT_LIMIT (0x40)**
The VOUT_OV_FAULT_LIMIT command sets the value of the output voltage that causes an output overvoltage fault.
|Command|VOUT_OV_FAULT_LIMIT|VOUT_OV_FAULT_LIMIT|VOUT_OV_FAULT_LIMIT|VOUT_OV_FAULT_LIMIT|VOUT_OV_FAULT_LIMIT|VOUT_OV_FAULT_LIMIT|VOUT_OV_FAULT_LIMIT|VOUT_OV_FAULT_LIMIT|VOUT_OV_FAULT_LIMIT|VOUT_OV_FAULT_LIMIT|VOUT_OV_FAULT_LIMIT|VOUT_OV_FAULT_LIMIT|VOUT_OV_FAULT_LIMIT|VOUT_OV_FAULT_LIMIT|VOUT_OV_FAULT_LIMIT|VOUT_OV_FAULT_LIMIT|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 16 relative format||||||||||||||||
|Default|0|0|0|0|0|1|0|0|1|1|0|0|1|1|0|0|
Bit [15:0]: A 16 bit, two’s complement integer.
The default value is 1.1992 (rounded).
.
## **VOUT_OV_FAULT_RESPONSE (0x41)**
The VOUT_OV_FAULT_RESPONSE command instructs the device on what action to take in response to an output overvoltage fault
|Command|VOUT_OV_FAULT_RESPONSE|VOUT_OV_FAULT_RESPONSE|VOUT_OV_FAULT_RESPONSE|VOUT_OV_FAULT_RESPONSE|VOUT_OV_FAULT_RESPONSE|VOUT_OV_FAULT_RESPONSE|VOUT_OV_FAULT_RESPONSE|VOUT_OV_FAULT_RESPONSE|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|1|1|0|0|0|0|0|0|
Valid values:
0x00: Continue without interruption
0x80: Shuts down and does not attempt to restart
0xC0: Shuts down and attempts to restart when the fault condition is no longer present (default)
Data Sheet
DS60001915A - 43
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **VOUT_OV_WARN_LIMIT (0x42)**
The VOUT_OV_WARN_LIMIT command sets the value of the output voltage that causes an output voltage high warning. This value is typically less than the output overvoltage threshold.
|Command|VOUT_OV_WARN_LIMIT|VOUT_OV_WARN_LIMIT|VOUT_OV_WARN_LIMIT|VOUT_OV_WARN_LIMIT|VOUT_OV_WARN_LIMIT|VOUT_OV_WARN_LIMIT|VOUT_OV_WARN_LIMIT|VOUT_OV_WARN_LIMIT|VOUT_OV_WARN_LIMIT|VOUT_OV_WARN_LIMIT|VOUT_OV_WARN_LIMIT|VOUT_OV_WARN_LIMIT|VOUT_OV_WARN_LIMIT|VOUT_OV_WARN_LIMIT|VOUT_OV_WARN_LIMIT|VOUT_OV_WARN_LIMIT|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 16 relative format||||||||||||||||
|Default|0|0|0|1|0|0|0|0|0|0|0|0|0|0|0|0|
Bit [15:0]: A 16 bit, two’s complement integer
The default value is 4.
## **VOUT_UV_WARN_LIMIT (0x43)**
The VOUT_UV_WARN_LIMIT command sets the value of the output voltage that causes an output voltage low warning. This value is typically greater than the output undervoltage fault threshold.
|Command|VOUT_UV_WARN_LIMIT|VOUT_UV_WARN_LIMIT|VOUT_UV_WARN_LIMIT|VOUT_UV_WARN_LIMIT|VOUT_UV_WARN_LIMIT|VOUT_UV_WARN_LIMIT|VOUT_UV_WARN_LIMIT|VOUT_UV_WARN_LIMIT|VOUT_UV_WARN_LIMIT|VOUT_UV_WARN_LIMIT|VOUT_UV_WARN_LIMIT|VOUT_UV_WARN_LIMIT|VOUT_UV_WARN_LIMIT|VOUT_UV_WARN_LIMIT|VOUT_UV_WARN_LIMIT|VOUT_UV_WARN_LIMIT|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 16 relative format||||||||||||||||
|Default|0|0|0|0|0|0|0|1|0|1|1|0|0|1|1|0|
Bit [15:0]: A 16 bit, two’s complement integer
The default value is 0.8496 (rounded).
## **VOUT_UV_FAULT_LIMIT (0x44)**
The VOUT_UV_FAULT_LIMIT command sets the value of the output voltage that causes an output undervoltage fault. This fault is masked until the unit reaches the programmed output voltage. This fault is also masked when the unit is disabled.
|Command|VOUT_UV_FAULT_LIMIT|VOUT_UV_FAULT_LIMIT|VOUT_UV_FAULT_LIMIT|VOUT_UV_FAULT_LIMIT|VOUT_UV_FAULT_LIMIT|VOUT_UV_FAULT_LIMIT|VOUT_UV_FAULT_LIMIT|VOUT_UV_FAULT_LIMIT|VOUT_UV_FAULT_LIMIT|VOUT_UV_FAULT_LIMIT|VOUT_UV_FAULT_LIMIT|VOUT_UV_FAULT_LIMIT|VOUT_UV_FAULT_LIMIT|VOUT_UV_FAULT_LIMIT|VOUT_UV_FAULT_LIMIT|VOUT_UV_FAULT_LIMIT|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 16 relative format||||||||||||||||
|Default|0|0|0|0|0||1|1|0|0|1|1|0|0|1|1|
Bit [15:0]: A 16 bit, two’s complement integer
The default value is 0.7998 (rounded).
## **VOUT_UV_FAULT_RESPONSE (0x45)**
The VOUT_UV_FAULT_RESPONSE command instructs the device on what action to take in response to an output undervoltage fault.
|Command|VOUT_UV_FAULT_RESPONSE|VOUT_UV_FAULT_RESPONSE|VOUT_UV_FAULT_RESPONSE|VOUT_UV_FAULT_RESPONSE|VOUT_UV_FAULT_RESPONSE|VOUT_UV_FAULT_RESPONSE|VOUT_UV_FAULT_RESPONSE|VOUT_UV_FAULT_RESPONSE|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|0|0|0|0|0|
Valid values:
0x00: Continue without interruption (default)
0x80: Shuts down and does not attempt to restart
Data Sheet
DS60001915A - 44
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **IOUT_OC_FAULT_LIMIT (0x46)**
The IOUT_OC_FAULT_LIMIT command sets the value of the output current, in Amperes, that causes the overcurrent detector to indicate an overcurrent fault condition.
|Command|IOUT_OC_FAULT_LIMIT|IOUT_OC_FAULT_LIMIT|IOUT_OC_FAULT_LIMIT|IOUT_OC_FAULT_LIMIT|IOUT_OC_FAULT_LIMIT|IOUT_OC_FAULT_LIMIT|IOUT_OC_FAULT_LIMIT|IOUT_OC_FAULT_LIMIT|IOUT_OC_FAULT_LIMIT|IOUT_OC_FAULT_LIMIT|IOUT_OC_FAULT_LIMIT|IOUT_OC_FAULT_LIMIT|IOUT_OC_FAULT_LIMIT|IOUT_OC_FAULT_LIMIT|IOUT_OC_FAULT_LIMIT|IOUT_OC_FAULT_LIMIT|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 11 format||||||||||||||||
|Default|1|1|1|1|1|0|0|0|0|1|0|0|0|0|1|0|
Bits [15:11]: A 5 bit, two’s complement exponent, fixed at –1
Bits [10:0]: An 11 bit, two’s complement mantissa
Valid range: 22 to 37.5A
The default value is 33A.
## **IOUT_OC_FAULT_RESPONSE (0x47)**
The IOUT_OC_FAULT_RESPONSE command instructs the device on what action to take in response to an output overcurrent fault.
|Command|IOUT_OC_FAULT_RESPONSE|IOUT_OC_FAULT_RESPONSE|IOUT_OC_FAULT_RESPONSE|IOUT_OC_FAULT_RESPONSE|IOUT_OC_FAULT_RESPONSE|IOUT_OC_FAULT_RESPONSE|IOUT_OC_FAULT_RESPONSE|IOUT_OC_FAULT_RESPONSE|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|1|1|1|1|1|0|0|0|
Valid values:
0xC0: Shuts down and does not attempt to restart
0xF8: Shuts down and attempts to restart continuously (default)
## **IOUT_OC_WARN_LIMIT (0x4A)**
The IOUT_OC_WARN_LIMIT commands sets the output current level in Amperes that cause the part to set the overcurrent warning flag in the STATUS_IOUT register and the corresponding bits in STATUS_BYTE and STATUS_WORD.
|Command|IOUT_OC_WARN_LIMIT|IOUT_OC_WARN_LIMIT|IOUT_OC_WARN_LIMIT|IOUT_OC_WARN_LIMIT|IOUT_OC_WARN_LIMIT|IOUT_OC_WARN_LIMIT|IOUT_OC_WARN_LIMIT|IOUT_OC_WARN_LIMIT|IOUT_OC_WARN_LIMIT|IOUT_OC_WARN_LIMIT|IOUT_OC_WARN_LIMIT|IOUT_OC_WARN_LIMIT|IOUT_OC_WARN_LIMIT|IOUT_OC_WARN_LIMIT|IOUT_OC_WARN_LIMIT|IOUT_OC_WARN_LIMIT|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 11 format||||||||||||||||
|Default|1|1|1|1|1|0|0|0|0|0|1|1|1|0|0|0|
Bits [15:11]: A 5 bit, two’s complement exponent, fixed at –1
Bits [10:0]: An 11 bit, two’s complement mantissa
The default value is 28A.
Data Sheet
DS60001915A - 45
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **OT_FAULT_LIMIT (0x4F)**
The OT_FAULT_LIMIT command sets the temperature, as read by the part for READ_TEMPERATURE, where the over temperature fault will be triggered. This is a different circuit than the analog circuit that sets a firm upper limit on the device temperature of 145°C.
|Command|OT_FAULT_LIMIT|OT_FAULT_LIMIT|OT_FAULT_LIMIT|OT_FAULT_LIMIT|OT_FAULT_LIMIT|OT_FAULT_LIMIT|OT_FAULT_LIMIT|OT_FAULT_LIMIT|OT_FAULT_LIMIT|OT_FAULT_LIMIT|OT_FAULT_LIMIT|OT_FAULT_LIMIT|OT_FAULT_LIMIT|OT_FAULT_LIMIT|OT_FAULT_LIMIT|OT_FAULT_LIMIT|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 11 format||||||||||||||||
|Default|0|0|0|0|0|0|0|0|1|0|0|1|0|0|0|1|
Bits [15:11]: A 5 bit, two’s complement exponent, fixed at 0
Bits [10:0]: An 11 bit, two’s complement mantissa
Maximum value: 150°C
The default value is 145°C.
## **OT_FAULT_RESPONSE (0x50)**
The OT_FAULT_RESPONSE command instructs the device on what action to take in response to an over temperature fault.
|Command|OT_FAULT_RESPONSE|OT_FAULT_RESPONSE|OT_FAULT_RESPONSE|OT_FAULT_RESPONSE|OT_FAULT_RESPONSE|OT_FAULT_RESPONSE|OT_FAULT_RESPONSE|OT_FAULT_RESPONSE|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|1|1|0|0|0|0|0|0|
Valid values:
0x00: Continue without interruption
0x80: Shuts down and does not attempt to restart
0xC0: Shuts down and attempts to restart when the fault condition is no longer present (default)
Note: The analog over temperature circuit will always cause the part to shut down and restart after cooling.
## **OT_WARN_LIMIT (0x51)**
The OT_WARN_LIMIT command sets the temperature, as read by the part for READ_TEMPERATURE, where the overtemperature issues an overtemperature warning in STATUS_TEMPERATURE.
|Command|OT_WARN_LIMIT|OT_WARN_LIMIT|OT_WARN_LIMIT|OT_WARN_LIMIT|OT_WARN_LIMIT|OT_WARN_LIMIT|OT_WARN_LIMIT|OT_WARN_LIMIT|OT_WARN_LIMIT|OT_WARN_LIMIT|OT_WARN_LIMIT|OT_WARN_LIMIT|OT_WARN_LIMIT|OT_WARN_LIMIT|OT_WARN_LIMIT|OT_WARN_LIMIT|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 11 format||||||||||||||||
|Default|0|0|0|0|0|0|0|0|0|1|1|1|1|1|0|1|
Bits [15:11]: A 5 bit, two’s complement exponent, fixed at 0
Bits [10:0]: An 11 bit, two’s complement mantissa
Default: 125 °C
Maximum value: 150°C
Data Sheet
DS60001915A - 46
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **VIN_OV_FAULT_LIMIT (0x55)**
The VIN_OV_FAULT_LIMIT command sets the value of the input voltage that causes an Input Overvoltage Fault.
|Command|VIN_OV_FAULT_LIMIT|VIN_OV_FAULT_LIMIT|VIN_OV_FAULT_LIMIT|VIN_OV_FAULT_LIMIT|VIN_OV_FAULT_LIMIT|VIN_OV_FAULT_LIMIT|VIN_OV_FAULT_LIMIT|VIN_OV_FAULT_LIMIT|VIN_OV_FAULT_LIMIT|VIN_OV_FAULT_LIMIT|VIN_OV_FAULT_LIMIT|VIN_OV_FAULT_LIMIT|VIN_OV_FAULT_LIMIT|VIN_OV_FAULT_LIMIT|VIN_OV_FAULT_LIMIT|VIN_OV_FAULT_LIMIT|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 11 format||||||||||||||||
|Default|0|0|0|0|0|0|0|0|0|0|0|1|0|0|1|0|
Bits [15:11]: A 5 bit, two’s complement exponent for the calculation, fixed at –1
Bits [10:0]: An 11 bit, two’s complement mantissa for the calculation
The default value is 18V.
The maximum value is 18V.
## **VIN_OV_FAULT_RESPONSE (0x56)**
The VIN_OV_FAULT_RESPONSE command instructs the device on what action to take in response to an Input Overvoltage Fault.
|Command|VIN_OV_FAULT_RESPONSE|VIN_OV_FAULT_RESPONSE|VIN_OV_FAULT_RESPONSE|VIN_OV_FAULT_RESPONSE|VIN_OV_FAULT_RESPONSE|VIN_OV_FAULT_RESPONSE|VIN_OV_FAULT_RESPONSE|VIN_OV_FAULT_RESPONSE|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|0|0|0|0|0|
Valid values:
0x00: Continue without interruption (default)
0x80: Shuts down and does not attempt to restart
## **VIN_UV_WARN_LIMIT (0x58)**
The VIN_UV_WARN_LIMIT command sets the value of the input voltage that causes an input voltage low warning. This value is typically greater than the Input Undervoltage Fault threshold, VIN_UV_FAULT_LIMIT.
|Command|VIN_UV_WARN_LIMIT|VIN_UV_WARN_LIMIT|VIN_UV_WARN_LIMIT|VIN_UV_WARN_LIMIT|VIN_UV_WARN_LIMIT|VIN_UV_WARN_LIMIT|VIN_UV_WARN_LIMIT|VIN_UV_WARN_LIMIT|VIN_UV_WARN_LIMIT|VIN_UV_WARN_LIMIT|VIN_UV_WARN_LIMIT|VIN_UV_WARN_LIMIT|VIN_UV_WARN_LIMIT|VIN_UV_WARN_LIMIT|VIN_UV_WARN_LIMIT|VIN_UV_WARN_LIMIT|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 11 format||||||||||||||||
|Default|1|1|1|1|1|0|0|0|0|0|0|0|0|1|1|0|
Bit [15:11]: A 5 bit, two’s complement exponent, fixed at –1
Bit [10:0]: An 11 bit, two’s complement mantissa
Valid range: 0V to 15.5V
The default value is 3V.
Data Sheet
DS60001915A - 47
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **POWER_GOOD_ON (0x5E)**
The POWER_GOOD_ON command sets the output voltage at which the POWER_GOOD signal will be asserted, indicating that the output voltage is valid.
|Command|POWER_GOOD_ON|POWER_GOOD_ON|POWER_GOOD_ON|POWER_GOOD_ON|POWER_GOOD_ON|POWER_GOOD_ON|POWER_GOOD_ON|POWER_GOOD_ON|POWER_GOOD_ON|POWER_GOOD_ON|POWER_GOOD_ON|POWER_GOOD_ON|POWER_GOOD_ON|POWER_GOOD_ON|POWER_GOOD_ON|POWER_GOOD_ON|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 16 relative format||||||||||||||||
|Default|0|0|0|0|0|0|1|1|0|1|1|0|0|1|0|1|
Bit [15:0]: Two linear16 data bytes
The default value is 0.8486 (rounded).
## **TON_DELAY (0x60)**
The TON_DELAY command sets the time, in milliseconds, from when a start condition is received until the output voltage starts to rise.
|Command|TON_DELAY|TON_DELAY|TON_DELAY|TON_DELAY|TON_DELAY|TON_DELAY|TON_DELAY|TON_DELAY|TON_DELAY|TON_DELAY|TON_DELAY|TON_DELAY|TON_DELAY|TON_DELAY|TON_DELAY|TON_DELAY|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 11 format||||||||||||||||
|Default|1|1|1|1|1|0|0|0|0|0|0|0|0|0|0|0|
Bit [15:11]: A 5 bit, two’s complement exponent, fixed at –1
Bit [10:0]: An 11 bit, two’s complement mantissa
Valid range: 0 to 127.5 ms
The default value is 0 ms.
## **TON_RISE (0x61)**
The TON_RISE command sets the time, in milliseconds, from when the output starts to rise until the voltage has entered the regulation band. A value of 0 ms instructs the unit to bring its output voltage to the programmed regulation value as quickly as possible.
|Command|TON_RISE|TON_RISE|TON_RISE|TON_RISE|TON_RISE|TON_RISE|TON_RISE|TON_RISE|TON_RISE|TON_RISE|TON_RISE|TON_RISE|TON_RISE|TON_RISE|TON_RISE|TON_RISE|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 11 format||||||||||||||||
|Default|1|1|1|1|0|0|0|0|0|0|0|0|1|1|0|0|
Bit [15:11]: A 5 bit, two’s complement exponent, fixed at –2
Bit [10:0]: An 11 bit, two’s complement mantissa Valid range: 0 to 127.75 ms
The default value is 3 ms.
Data Sheet
DS60001915A - 48
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **TON_MAX_FAULT_LIMIT (0x62)**
The TON_MAX_FAULT_LIMIT command sets an upper limit, in milliseconds, on how long the unit can attempt to power up the output without reaching the output undervoltage fault limit. A value of 0 ms means that there is no limit and that the unit can attempt to bring up the output voltage indefinitely.
|<br>indefnitely.|||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Command|TON_MAX_FAULT_LIMIT||||||||||||||||
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 11 format||||||||||||||||
|Default|1|1|1|1|0|0|0|0|0|0|0|0|0|0|0|0|
Bit [15:11]: A 5 bit, two’s complement exponent, fixed at –2
Bit [10:0]: An 11 bit, two’s complement mantissa
Valid range: 0 to 127.75 ms
The default value is 0 ms.
## **TON_MAX_FAULT_RESPONSE (0x63)**
The TON_MAX_FAULT_RESPONSE command instructs the device on what action to take in response to a TON_MAX fault.
**Note:** This command must be written twice in succession for changes to take effect.
|Command|TON_MAX_FAULT_RESPONSE|TON_MAX_FAULT_RESPONSE|TON_MAX_FAULT_RESPONSE|TON_MAX_FAULT_RESPONSE|TON_MAX_FAULT_RESPONSE|TON_MAX_FAULT_RESPONSE|TON_MAX_FAULT_RESPONSE|TON_MAX_FAULT_RESPONSE|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|0|0|0|0|0|
Valid values:
0x00: Continue without interruption (default)
0x80: Shuts down and does not attempt to restart
## **TOFF_DELAY (0x64)**
The TOFF_DELAY command sets the time, in milliseconds, from when a stop condition is received (as programmed by the ON_OFF_CONFIG command) until the unit stops transferring energy to the output.
|<br>output.|||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Command|TOFF_DELAY||||||||||||||||
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 11 format||||||||||||||||
|Default|1|1|1|1|1|0|0|0|0|0|0|0|0|0|0|0|
Bit [15:11]: A 5 bit, two’s complement exponent, fixed at –1
Bit [10:0]: An 11 bit, two’s complement mantissa
Valid range: 0 to 127.5 ms
The default value is 0 ms.
Data Sheet
DS60001915A - 49
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **TOFF_FALL (0x65)**
The TOFF_FALL command sets the time, in milliseconds, from the end of the turn-OFF delay time until the voltage is commanded to zero. A value of 0 ms means that the device should ramp the output voltage down as fast as it can.
|Command|TOFF_FALL|TOFF_FALL|TOFF_FALL|TOFF_FALL|TOFF_FALL|TOFF_FALL|TOFF_FALL|TOFF_FALL|TOFF_FALL|TOFF_FALL|TOFF_FALL|TOFF_FALL|TOFF_FALL|TOFF_FALL|TOFF_FALL|TOFF_FALL|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R/W, Linear 11 format||||||||||||||||
|Default|1|1|1|1|0|0|0|0|0|0|0|0|1|0|0|0|
Bit [15:11]: A 5 bit, two’s complement exponent, fixed at –2
Bit [10:0]: An 11 bit, two’s complement mantissa
Valid range: 0 to 127.75 ms
The default value is 2 ms.
## **STATUS_BYTE (0x78)**
The STATUS_BYTE command returns one byte of information with a summary of the most critical faults.
|<br>faults.|||||||||
|---|---|---|---|---|---|---|---|---|
|Command|STATUS_BYTE||||||||
|Bit|7|6|5|4|3|2|1|0|
|Access|R|R|R|R|R|R|R|R|
|Default|0|0|0|0|0|0|0|0|
Bit [7]: A fault was declared because the device was busy and unable to respond
Bit [6]: This bit is asserted if the unit is not providing power to the output, regardless of the reason, including simply not being enabled
Bit [5]: An output overvoltage fault has occurred
Bit [4]: An output overcurrent fault has occurred
Bit [3]: An input undervoltage fault has occurred
Bit [2]: A temperature fault or warning has occurred
Bit [1]: A communications, memory or logic fault has occurred
Bit [0]: A fault or warning not listed in bits [7:1] has occurred
Data Sheet
DS60001915A - 50
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **STATUS_WORD (0x79)**
The STATUS_WORD command returns two bytes of information with a summary of the unit’s fault condition. Based on the information in these bytes, the host can get more information by reading the appropriate status registers. The low byte of the STATUS_WORD is the same register as the STATUS_BYTE command.
|Command|STATUS_WORD (HIGH BYTE)|STATUS_WORD (HIGH BYTE)|STATUS_WORD (HIGH BYTE)|STATUS_WORD (HIGH BYTE)|STATUS_WORD (HIGH BYTE)|STATUS_WORD (HIGH BYTE)|STATUS_WORD (HIGH BYTE)|STATUS_WORD (HIGH BYTE)|
|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|
|Access|R|R|R|R|R|R|R|R|
|Default|0|0|0|0|0|0|0|0|
Bit [15]: An output voltage fault or warning has occurred
Bit [14]: An output current fault or warning has occurred.
Bit [13]: An input voltage fault or warning has occurred Bit [12]: A manufacturer specific fault or warning has occurred
Bit [11]: The POWER_GOOD signal, if present, is negated Bit [10]: A fan or airflow fault or warning has occurred (not used)
Bit [9]: A bit in STATUS_OTHER is set (not used)
Bit [8]: A fault type not given in bits [15:1] of the STATUS_WORD
## **STATUS_VOUT (0x7A)**
The STATUS_VOUT command returns one byte of information relating to the status of the converter's output voltage related faults.
|Command|STATUS_VOUT|STATUS_VOUT|STATUS_VOUT|STATUS_VOUT|STATUS_VOUT|STATUS_VOUT|STATUS_VOUT|STATUS_VOUT|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R|R|R|R|R|R|R|R|
|Default|0|0|0|0|0|0|0|0|
Bit [7]: OUT_OV_FAULT
Bit [6]: VOUT_OV_WARNING
Bit [5]: VOUT_UV_WARNING
Bit [4]: VOUT_UV_FAULT
Bit [3]: VOUT_MAX_MIN Warning Bit [2]: TON_MAX_FAULT Bit [1]: TOFF_MAX_WARNING Bit [0]: VOUT Tracking Error (not used)
Data Sheet
DS60001915A - 51
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **STATUS_IOUT (0x7B)**
The STATUS_IOUT command returns one byte of information relating to the status of the converter’s output current related faults.
|Command|STATUS_IOUT|STATUS_IOUT|STATUS_IOUT|STATUS_IOUT|STATUS_IOUT|STATUS_IOUT|STATUS_IOUT|STATUS_IOUT|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R|R|R|R|R|R|R|R|
|Default|0|0|0|0|0|0|0|0|
Bit [7]: IOUT_OC_FAULT
Bit [6]: IOUT_OC_LV_FAULT
Bit [5]: IOUT_OC_WARNING
Bit [4]: IOUT_UC_FAULT (not used)
Bit [3]: Current Share Fault (not used)
Bit [2]: In Power Limiting Mode (not used)
Bit [1]: POUT_OP_FAULT (not used)
Bit [0]: POUT_OP_WARNING (not used)
## **STATUS_INPUT (0x7C)**
The STATUS_INPUT command returns one byte of information relating to the status of the input related faults of the converter.
|Command|STATUS_INPUT|STATUS_INPUT|STATUS_INPUT|STATUS_INPUT|STATUS_INPUT|STATUS_INPUT|STATUS_INPUT|STATUS_INPUT|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R|R|R|R|R|R|R|R|
|Default|0|0|0|0|0|0|0|0|
Bit [7]: VIN_OV_FAULT
Bit [6]: VIN_OV_WARNING Bit [5]: VIN_UV_WARNING
Bit [4]: VIN_UV_FAULT Bit [3]: Unit OFF For Insufficient Input Voltage
Bit [2]: IIN_OC_FAULT (not used) Bit [1]: IIN_OC_WARNING (not used) Bit [0]: PIN_OP_WARNING (not used)
Data Sheet
DS60001915A - 52
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **STATUS_TEMPERATURE (0x7D)**
The STATUS_TEMPERATURE command returns one byte of information relating to the status of the external temperature related faults.
|Command|STATUS_TEMPERATURE|STATUS_TEMPERATURE|STATUS_TEMPERATURE|STATUS_TEMPERATURE|STATUS_TEMPERATURE|STATUS_TEMPERATURE|STATUS_TEMPERATURE|STATUS_TEMPERATURE|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R|R|R|R|R|R|R|R|
|Default|0|0|0|0|0|0|0|0|
Bit [7]: OT_FAULT
Bit [6]: OT_WARNING
Bit [5]: UT_WARNING (not used)
Bit [4]: UT_FAULT (not used)
Bit [3:0]: Reserved
## **STATUS_CML (0x7E)**
The STATUS_CML command returns one byte of information relating to the status of the communication-related faults of the converter.
|Command|STATUS_CML|STATUS_CML|STATUS_CML|STATUS_CML|STATUS_CML|STATUS_CML|STATUS_CML|STATUS_CML|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R|R|R|R|R|R|R|R|
|Default|0|0|0|0|0|0|0|0|
Bit [7]: Invalid or unsupported command received
Bit [6]: Invalid or unsupported data received
Bit [5]: Packet error check failed (not used)
Bit [4]: Memory fault detected
Bit [3]: Processor fault detected
Bit [2]: Reserved
Bit [1]: A communication fault other than the ones listed in this table has occurred
Bit [0]: Other memory or logic fault has occurred
## **READ_VIN (0x88)**
The READ_VIN command returns two bytes of data in the linear data format that represent the input voltage of the converter.
|Command|READ_VIN|READ_VIN|READ_VIN|READ_VIN|READ_VIN|READ_VIN|READ_VIN|READ_VIN|READ_VIN|READ_VIN|READ_VIN|READ_VIN|READ_VIN|READ_VIN|READ_VIN|READ_VIN|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R, Linear 11 format||||||||||||||||
|Default|1|1|1|0|0|—|—|—|—|—|—|—|—|—|—|—|
Bits [15:11]: A two’s complement exponent, –4
Bits [10:0]: An 11 bit two’s complement mantissa
Data Sheet
DS60001915A - 53
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **READ_VOUT (0x8B)**
The READ_VOUT command returns two bytes of data in the linear 16 data format that represent the output voltage of the converter.
|Command|READ_VOUT|READ_VOUT|READ_VOUT|READ_VOUT|READ_VOUT|READ_VOUT|READ_VOUT|READ_VOUT|READ_VOUT|READ_VOUT|READ_VOUT|READ_VOUT|READ_VOUT|READ_VOUT|READ_VOUT|READ_VOUT|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R, Linear 16 format||||||||||||||||
|Default|—|—|—|—|—|—|—|—|—|—|—|—|—|—|—|—|
Bits [15:0]: A two’s complement linear 16 format word
## **READ_IOUT (0x8C)**
The READ_IOUT commands returns two bytes of data in the linear 11 data format that represents the output current of the converter.
|Command|READ_IOUT|READ_IOUT|READ_IOUT|READ_IOUT|READ_IOUT|READ_IOUT|READ_IOUT|READ_IOUT|READ_IOUT|READ_IOUT|READ_IOUT|
|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|
|Access|R, Linear 11 format|||||||||||
|Default|1|1|1|0|0|—|—|—|—|—|—|
Bits [15:11]: A 5-bit, two’s complement exponent, fixed at –4
Bits [10:0]: An 11-bit, two’s complement mantissa
## **READ_TEMPERATURE (0x8D)**
The READ_TEMPERATURE command returns the external temperature in degrees Celsius.
|Command|READ_TEMPERATURE|READ_TEMPERATURE|READ_TEMPERATURE|READ_TEMPERATURE|READ_TEMPERATURE|READ_TEMPERATURE|READ_TEMPERATURE|READ_TEMPERATURE|READ_TEMPERATURE|READ_TEMPERATURE|READ_TEMPERATURE|READ_TEMPERATURE|READ_TEMPERATURE|READ_TEMPERATURE|READ_TEMPERATURE|READ_TEMPERATURE|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|R, Linear 11 format||||||||||||||||
|Default|0|0|0|0|0|—|—|—|—|—|—|—|—|—|—|—|
Bits [15:11]: A two’s complement exponent, 0
Bits [10:0]: An 11 bit two’s complement mantissa
## **PMBUS_REVISION (0x98)**
PMBUS_REVISION command stores or reads the revision of the PMBus to which the device is compliant.
|<br>compliant.|||||||||
|---|---|---|---|---|---|---|---|---|
|Command|PMBUS_REVISION||||||||
|Bit|7|6|5|4|3|2|1|0|
|Access|R|R|R|R|R|R|R|R|
|Default|0|0|1|1|0|0|1|1|
Bit [7:4]: Indicate the revision of PMBus specification Part I to which the device is compliant Value: 0011, PMBus version 1.3
Bit [3:0]: Indicate the revision of PMBus specification Part II to which the device is compliant Value: 0011, PMBus version 1.3
Data Sheet
DS60001915A - 54
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **MFR_ID (0x99)**
The MFR_ID command is used to either set or read the manufacturer’s ID (name, abbreviation or symbol that identifies the unit’s manufacturer). The actual data for this command is 3 bytes. The high order byte here is the byte count in the SMBus block read and block write transactions.
|Command|MFR_ID, HIGH TWO BYTES|MFR_ID, HIGH TWO BYTES|MFR_ID, HIGH TWO BYTES|MFR_ID, HIGH TWO BYTES|MFR_ID, HIGH TWO BYTES|MFR_ID, HIGH TWO BYTES|MFR_ID, HIGH TWO BYTES|MFR_ID, HIGH TWO BYTES|MFR_ID, HIGH TWO BYTES|MFR_ID, HIGH TWO BYTES|MFR_ID, HIGH TWO BYTES|MFR_ID, HIGH TWO BYTES|MFR_ID, HIGH TWO BYTES|MFR_ID, HIGH TWO BYTES|MFR_ID, HIGH TWO BYTES|MFR_ID, HIGH TWO BYTES|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|31|30|29|28|27|26|25|24|23|22|21|20|19|18|17|16|
|Access|Block R/W||||||||||||||||
|Default|0|0|0|0|0|0|1|1|0|1|0|1|0|1|0|0|
||||||||||||||||||
|Command|MFR_ID, LOW TWO BYTES||||||||||||||||
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|Block R/W||||||||||||||||
|Default|0|1|0|0|0|1|0|0|0|1|0|0|1|0|1|1|
## **MFR_MODEL (0x9A)**
The MFR_MODEL command is used to either set or read the manufacturer’s model number. The actual data for this command is 1 byte. The high order byte here is the byte count in the SMBus block read and block write transactions.
|Command|MFR_MODEL|MFR_MODEL|MFR_MODEL|MFR_MODEL|MFR_MODEL|MFR_MODEL|MFR_MODEL|MFR_MODEL|MFR_MODEL|MFR_MODEL|MFR_MODEL|MFR_MODEL|MFR_MODEL|MFR_MODEL|MFR_MODEL|MFR_MODEL|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|Block R/W||||||||||||||||
|Default|0|0|0|0|0|0|0|1|0|0|0|0|0|0|0|0|
## **MFR_REVISION (0x9B)**
The MFR_REVISION command is used to either set or read the manufacturer’s revision number. The actual data for this command is 1 byte. The high order byte here is the byte count in the SMBus block read and block write transactions.
|Command|MFR_REVISION|MFR_REVISION|MFR_REVISION|MFR_REVISION|MFR_REVISION|MFR_REVISION|MFR_REVISION|MFR_REVISION|MFR_REVISION|MFR_REVISION|MFR_REVISION|MFR_REVISION|MFR_REVISION|MFR_REVISION|MFR_REVISION|MFR_REVISION|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|Block R/W||||||||||||||||
|Default|0|0|0|0|0|0|0|1|0|0|0|0|0|0|0|0|
## **IC_DEVICE_ID (0xAD)**
Th IC_DEVICE_ID command is a read-only block-read command that returns 2 bytes with the unique device-code identifier for the device. The actual data for this command is 1 byte. The high order byte here is the byte count in the SMBus block read and block write transactions.
|Command|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|Block R||||||||||||||||
|Default|0|0|0|0|0|0|0|1|0|0|0|1|1|0|0|1|
Data Sheet
DS60001915A - 55
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 PMBus Commands**
## **IC_DEVICE_REV (0xAE)**
The IC_DEVICE_REV command is used to read the revision of the IC. The actual data for this command is 1 byte. The high order byte here is the byte count in the SMBus block read and block write transactions.
|Command|IC_DEV_REV|IC_DEV_REV|IC_DEV_REV|IC_DEV_REV|IC_DEV_REV|IC_DEV_REV|IC_DEV_REV|IC_DEV_REV|IC_DEV_REV|IC_DEV_REV|IC_DEV_REV|IC_DEV_REV|IC_DEV_REV|IC_DEV_REV|IC_DEV_REV|IC_DEV_REV|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Bit|15|14|13|12|11|10|9|8|7|6|5|4|3|2|1|0|
|Access|Block R||||||||||||||||
|Default|0|0|0|0|0|0|0|1|0|0|0|0|0|0|0|0|
Data Sheet
DS60001915A - 56
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **8. Register List**
**Table 8-1.** Register List
|**No. **|**Name**|**Adr.**||**No. **|**Name**|**Adr.**||**No. **|**Name**|**Adr.**|
|---|---|---|---|---|---|---|---|---|---|---|
|1|I2C_BASE|0x40||44|OT_FAULT_LIMIT _UPPER|0x6E||87|BOOT_VOLTAGE_1_LOWER|0x9D|
|2|PMBUS_BASE|0x41||45|OT_FAULT_RESPONSE|0x6F||88|BOOT_VOLTAGE_1_UPPER|0x9E|
|3|OPERATION|0x42||46|OT_WARN_LIMIT_LOWER|0x70||89|BOOT_VOLTAGE_2_LOWER|0x9F|
|4|ON_OFF_CONFIG|0x43||47|OT_WARN_LIMIT _UPPER|0x71||90|BOOT_VOLTAGE_2_UPPER|0xA0|
|5|WRITE_PROTECT|0x44||48|VIN_OV_FAULT_LIMIT_LOWER|0x72||91|BOOT_VOLTAGE_3_LOWER|0xA1|
|6|MASK_BYTE_VOUT|0x45||49|VIN_OV_FAULT_LIMIT_UPPER|0x73||92|BOOT_VOLTAGE_3_UPPER|0xA2|
|7|MASK_BYTE_IOUT|0x46||50|VIN_OV_FAULT_RESPONSE|0x74||93|BOOT_VOLTAGE_4_LOWER|0xA3|
|8|MASK_BYTE_INPUT|0x47||51|VIN_UV_WARN_LIMIT_LOWER|0x75||94|BOOT_VOLTAGE_4_UPPER|0xA4|
|9|MASK_BYTE_TEMP|0x48||52|VIN_UV_WARN_LIMIT_UPPER|0x76||95|BOOT_VOLTAGE_5_LOWER|0xA5|
|10|MASK_BYTE_CML|0x49||53|POWER_GOOD_ON_LOWER|0x77||96|BOOT_VOLTAGE_5_UPPER|0xA6|
|11|VOUT_MODE|0x4B||54|POWER_GOOD_ON_UPPER|0x78||97|BOOT_VOLTAGE_6_LOWER|0xA7|
|12|VOUT_COMMAND_LOWER|0x4C||55|FAULT_BUS_CONFIG_MASK|0x79||98|BOOT_VOLTAGE_6_UPPER|0xA8|
|13|VOUT_COMMAND_UPPER|0x4D||56|FAULT_BUS_LATCH_SEL|0x7A||99|BOOT_VOLTAGE_7_LOWER|0xA9|
|14|VOUT_MAX_LOWER|0x4E||57|TON_DELAY_LOWER|0x7B||100|BOOT_VOLTAGE_7_UPPER|0xAA|
|15|VOUT_MAX_UPPER|0x4F||58|TON_DELAY_UPPER|0x7C||101|BOOT_VOLTAGE_8_LOWER|0xAB|
|16|VOUT_MARGIN_HIGH_LOWER|0x50||59|TON_RISE_LOWER|0x7D||102|BOOT_VOLTAGE_8_UPPER|0xAC|
|17|VOUT_MARGIN_HIGH_UPPER|0x51||60|TON_RISE_UPPER|0x7E||103|STATUS_VOUT|0xC0|
|18|VOUT_MARGIN_LOW_LOWER|0x52||61|TON_MAX_FAULT_LIMIT_LOWER|0x7F||104|STATUS_IOUT|0xC1|
|19|VOUT_MARGIN_LOW_UPPER|0x53||62|TON_MAX_FAULT_LIMIT_UPPER|0x80||105|STATUS_INPUT|0xC2|
|20|VOUT_TRANSITION_RATE_LOWER|0x54||63|TON_MAX_FAULT_RESPONSE|0x81||106|STATUS_TEMPERATURE|0xC3|
|21|VOUT_TRANSITION_RATE _UPPER|0x55||64|TOFF_DELAY_LOWER|0x82||107|STATUS_CML|0xC4|
|22|VIN_ON_LOWER|0x58||65|TOFF_DELAY_UPPER|0x83||108|STATUS_BYTE|0xC6|
|23|VIN_ON _UPPER|0x59||66|TOFF_FALL_LOWER|0x84||109|STATUS_WORD_HIGH|0xC7|
|24|VIN_OFF_LOWER|0x5A||67|TOFF_FALL_UPPER|0x85||110|BURN_OTP|0xC9|
|25|VIN_OFF _UPPER|0x5B||68|MFR_ID_COUNT|0x86||111|CLEAR_STATUS|0xCC|
|26|IOUT_CAL_OFFSET_LOWER|0x5C||69|MFR_ID_1|0x87||112|PVIN_REPORT_LOWER|0xD2|
|27|IOUT_CAL_OFFSET_UPPER|0x5D||70|MFR_ID_2|0x88||113|PVIN_REPORT_UPPER|0xD3|
|28|VOUT_OV_FAULT_LIMIT_LOWER|0x5E||71|MFR_ID_3|0x89||114|IOUT_REPORT_LOWER|0xD4|
|29|VOUT _OV_FAULT_LIMIT_UPPER|0x5F||72|MFR_MODEL_COUNT|0x8A||115|IOUT_REPORT_UPPER|0xD5|
|30|VOUT _OV_FAULT_RESPONSE|0x60||73|MFR_MODEL|0x8B||116|VOUT_REPORT_LOWER|0xD6|
|31|VOUT _OV_WARN_LIMIT_LOWER|0x61||74|MFR_REVISION_COUNT|0x8C||117|VOUT_REPORT_UPPER|0xD7|
|32|VOUT _OV_WARN_LIMIT_UPPER|0x62||75|MFR_REVISION|0x8D||118|TEMP_REPORT_LOWER|0xD8|
|33|VOUT _UV_WARN_LIMIT_LOWER|0x63||76|FAULT_PIN|0x90||119|TEMP_REPORT_UPPER|0xD9|
|34|VOUT _UV_WARN_LIMIT_UPPER|0x64||77|BUS_VOLTAGE|0x91||120|VCC_REPORT_LOWER|0xDA|
|35|VOUT _UV_FAULT_LIMIT_LOWER|0x65||78|CB_OV_UV|0x94||121|VCC_REPORT_UPPER|0xDB|
|36|VOUT _UV_FAULT_LIMIT_UPPER|0x66||79|CURRENT_REPORT_GAIN|0x95||122|NCL_INDICATION|0xF0|
|37|VOUT _UV_FAULT_RESPONSE|0x67||80|VOUT_REPORT_GAIN|0x96||123|DAC_CODE|0xF1|
|38|IOUT_OC_FAULT_LIMIT_LOWER|0x68||81|VOUT_REPORT_OFFSET|0x97||124|USER_OTP_POINTER|0xF2|
|39|IOUT_OC_FAULT_LIMIT_UPPER|x69||82|PVIN_REPORT_GAIN|0x98||125|STATUS|0xF3|
|40|IOUT_OC_FAULT_RESPONSE|0x6A||83|PVIN_REPORT_OFFSET|0x99||126|IC_REV_BYTE_COUNT|0xF4|
|41|IOUT_OC_WARN_LIMIT_LOWER|0x6B||84|TEMP_REPORT_GAIN|0x9A||127|IC_REV|0xF5|
|42|IOUT_OC_WARN_LIMIT_UPPER|0x6C||85|TEMP_REPORT_OFFSET|0x9B||128|IC_DEV_ID_COUNT|0xF6|
|43|OT_FAULT_LIMIT_LOWER|0x6D||86|NVM_CRC|0x9C||129|IC_DEV_ID|0xF7|
Data Sheet
DS60001915A - 57
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **I2C_BASE (0x40)**
|Register|I2C base Address|I2C base Address|I2C base Address|I2C base Address|I2C base Address|I2C base Address|I2C base Address|I2C base Address|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access||R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|X|0|0|1|0|0|0|0|
Bit [7]: Not used
Bits [6:0]: Base address for register level I[2] C access
Default value: 0x10
## **PMBUS_BASE (0x41)**
|Register|PMBus base Address|PMBus base Address|PMBus base Address|PMBus base Address|PMBus base Address|PMBus base Address|PMBus base Address|PMBus base Address|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access||R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|X|1|1|1|0|0|0|0|
Bit [7]: Not used
Bits [6:0]: Base address for PMBUS access
Default value: 0x70
## **OPERATION (0x42)**
For a description of this register contents, see the OPERATION command in the PMBus Commands section.
## **ON_OFF_CONFIG (0x43)**
For a description of this register content, see the ON_OFF_CONFIG command in the PMBus Commands section.
## **WRITE_PROTECT (0x44)**
For a description of this register contents, see the WRITE_PROTECT command in the PMBus Commands section. Note that the protections in this register only apply to PMBus access. All access is always available via the direct register level I[2] C access.
## **MASK_BYTE_VOUT (0x45)**
This register contains the mask byte applied to the STATUS_VOUT register using the SMBALERT_MASK command.
|Register|MASK_BYTE_VOUT|MASK_BYTE_VOUT|MASK_BYTE_VOUT|MASK_BYTE_VOUT|MASK_BYTE_VOUT|MASK_BYTE_VOUT|MASK_BYTE_VOUT|MASK_BYTE_VOUT|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|0|0|0|0|0|
## **MASK_BYTE_IOUT (0x46)**
This register contains the mask byte applied to the STATUS_IOUT register using the SMBALERT_MASK command.
|Register|MASK_BYTE_IOUT|MASK_BYTE_IOUT|MASK_BYTE_IOUT|MASK_BYTE_IOUT|MASK_BYTE_IOUT|MASK_BYTE_IOUT|MASK_BYTE_IOUT|MASK_BYTE_IOUT|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|0|0|0|0|0|
Data Sheet
DS60001915A - 58
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **MASK_BYTE_INPUT (0x47)**
This register contains the mask byte applied to the STATUS_INPUT register using the SMBALERT_MASK command.
|Register|MASK_BYTE_INPUT|MASK_BYTE_INPUT|MASK_BYTE_INPUT|MASK_BYTE_INPUT|MASK_BYTE_INPUT|MASK_BYTE_INPUT|MASK_BYTE_INPUT|MASK_BYTE_INPUT|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|0|0|0|0|0|
## **MASK_BYTE_TEMP (0x48)**
This register contains the mask byte applied to the STATUS_TEMP register using the SMBALERT_MASK command.
|Register|MASK_BYTE_ TEMP|MASK_BYTE_ TEMP|MASK_BYTE_ TEMP|MASK_BYTE_ TEMP|MASK_BYTE_ TEMP|MASK_BYTE_ TEMP|MASK_BYTE_ TEMP|MASK_BYTE_ TEMP|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|0|0|0|0|0|
## **MASK_BYTE_CML (0x49)**
This register contains the mask byte applied to the STATUS_CML register using the SMBALERT_MASK command.
|<br>command.|||||||||
|---|---|---|---|---|---|---|---|---|
|Register|MASK_BYTE_ CML||||||||
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|0|0|0|0|0|
## **VOUT_MODE (0x4B)**
For a description of this register contents, see the VOUT_MODE command in the PMBus Commands section.
## **VOUT_COMMAND_LOWER (0x4C)**
For a description of this register contents, see the VOUT_COMMAND command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x4D.
## **VOUT_COMMAND_UPPER (0x4D)**
For a description of this register contents, see the VOUT_COMMAND command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x4C.
## **VOUT_MAX_LOWER (0x4E)**
For a description of this register contents, see the VOUT_MAX command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x4F.
## **VOUT_MAX_UPPER (0x4F)**
For a description of this register contents, see the VOUT_MAX command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x4E.
## **VOUT_MARGIN_HIGH_LOWER (0x50)**
For a description of this register contents, see the VOUT_MARGIN_HIGH command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x51.
Data Sheet
DS60001915A - 59
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **VOUT_MARGIN_HIGH_UPPER (0x51)**
For a description of this register contents, see the VOUT_MARGIN_HIGH command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x50.
## **VOUT_MARGIN_LOW_LOWER (0x52)**
For a description of this register contents, see the VOUT_MARGIN_LOW command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x53.
## **VOUT_MARGIN_LOW_UPPER (0x53)**
For a description of this register contents, see the VOUT_MARGIN_LOW command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x52
## **VOUT_TRANSITION_RATE_LOWER (0x54)**
For a description of this register contents, see the VOUT_TRANSITION_RATE command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x55.
## **VOUT_TRANSITION_RATE _UPPER (0x55)**
For a description of this register contents, see the VOUT_ TRANSITION_RATE command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x54.
## **VIN_ON_LOWER (0x58)**
For a description of this register contents, see the VIN_ON command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x59.
## **VIN_ON _UPPER (0x59)**
For a description of this register contents, see the VIN_ON command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x58.
## **VIN_OFF_LOWER (0x5A)**
For a description of this register contents, see the VIN_OFF command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x5B.
## **VIN_OFF _UPPER (0x5B)**
For a description of this register contents, see the VIN_OFF command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x5A.
## **IOUT_CAL_OFFSET_LOWER (0x5C)**
For a description of this register contents, see the IOUT_CAL_OFFSET command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x5D.
## **IOUT_CAL_OFFSET_UPPER (0x5D)**
For a description of this register contents, see the IOUT_CAL_OFFSET command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x5C.
Data Sheet
DS60001915A - 60
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **VOUT_OV_FAULT_LIMIT_LOWER (0x5E)**
For a description of this register contents, see the VOUT_OV_FAULT_LIMIT command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x5F.
## **VOUT _OV_FAULT_LIMIT_UPPER (0x5F)**
For a description of this register contents, see the VOUT_OV_FAULT_LIMIT command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x5E.
## **VOUT _OV_FAULT_RESPONSE (0x60)**
For a description of this register contents, see the VOUT_OV_FAULT_RESPONSE command in the PMBus Commands section.
## **VOUT _OV_WARN_LIMIT_LOWER (0x61)**
For a description of this register contents, see the VOUT_OV_WARN_LIMIT command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x62.
## **VOUT _OV_WARN_LIMIT_UPPER (0x62)**
For a description of this register contents, see the VOUT_ OV_WARN_LIMIT command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x61.
## **VOUT _UV_WARN_LIMIT_LOWER (0x63)**
For a description of this register contents, see the VOUT_UV_WARN_LIMIT command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x64.
## **VOUT _UV_WARN_LIMIT_UPPER (0x64)**
For a description of this register contents, see the VOUT_ UV_WARN_LIMIT command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x63.
## **VOUT _UV_FAULT_LIMIT_LOWER (0x65)**
For a description of this register contents, see the VOUT_UV_FAULT_LIMIT command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x66.
## **VOUT _UV_FAULT_LIMIT_UPPER (0x66)**
For a description of this register contents, see the VOUT_ UV_FAULT_LIMIT command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x65.
## **VOUT _UV_FAULT_RESPONSE (0x67)**
For a description of this register contents, see the VOUT_UV_FAULT_RESPONSE command in the PMBus Commands section.
## **IOUT_OC_FAULT_LIMIT_LOWER (0x68)**
For a description of this register contents, see the IOUT_OC_FAULT_LIMIT command in the PMBus Commands section. This register contains the low byte of the data for that command. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x69.
Data Sheet
DS60001915A - 61
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **IOUT_OC_FAULT_LIMIT_UPPER (0x69)**
For a description of this register contents, see the IOUT_OC_FAULT_LIMIT command in the PMBus Commands section. This register contains the high byte of the data for that command. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x68.
## **IOUT_OC_FAULT_RESPONSE (0x6A)**
For a description of this register contents, see the IOUT_OC_FAULT_RESPONSE command in the PMBus Commands section.
## **IOUT_OC_WARN_LIMIT_LOWER (0x6B)**
For a description of this register contents, see the IOUT_OC_WARN_LIMIT command in the PMBus Commands section. This register contains the low byte of the data for that command. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x6C.
## **IOUT_OC_WARN_LIMIT_UPPER (0x6C)**
For a description of this register contents, see the IOUT_OC_WARN_LIMIT command in the PMBus Commands section. This register contains the high byte of the data for that command. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x6B.
## **OT_FAULT_LIMIT_LOWER (0x6D)**
For a description of this register contents, see the OT_FAULT_LIMIT command in the PMBus Commands section. This register contains the low byte of the data for that command. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x6E.
## **OT_FAULT_LIMIT _UPPER (0x6E)**
For a description of this register contents, see the OT_FAULT_LIMIT command in the PMBus Commands section. This register contains the high byte of the data for that command. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x6D.
## **OT_FAULT_RESPONSE (0x6F)**
For a description of this register contents, see the OT_FAULT_RESPONSE command in the PMBus Commands section.
## **OT_WARN_LIMIT_LOWER (0x70)**
For a description of this register contents, see the OT_WARN_LIMIT command in the PMBus Commands section. This register contains the low byte of the data for that command. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x71.
## **OT_WARN_LIMIT _UPPER (0x71)**
For a description of this register contents, see the OT_WARN_LIMIT command in the PMBus Commands section. This register contains the high byte of the data for that command. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x70.
## **VIN_OV_FAULT_LIMIT_LOWER (0x72)**
For a description of this register contents, see the VIN_OV_FAULT_LIMIT command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x73.
Data Sheet
DS60001915A - 62
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **VIN_OV_FAULT_LIMIT_UPPER (0x73)**
For a description of this register contents, see the VIN_OV_FAULT_LIMIT command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x72.
## **VIN_OV_FAULT_RESPONSE (0x74)**
For a description of this register contents, see the VIN_OV_FAULT_RESPONSE command in the PMBus Commands section.
## **VIN_UV_WARN_LIMIT_LOWER (0x75)**
For a description of this register contents, see the VIN_UV_WARN_LIMIT command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x76.
## **VIN_UV_WARN_LIMIT_UPPER (0x76)**
For a description of this register contents, see the VIN_UV_WARN_LIMIT command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x75.
## **POWER_GOOD_ON_LOWER (0x77)**
For a description of this register contents, see the POWER_GOOD_ON command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x78.
## **POWER_GOOD_ON_UPPER (0x78)**
For a description of this register contents, see the POWER_GOOD_ON command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x77.
## **FAULT_BUS_CONFIG_MASK (0x79)**
This register masks various fault conditions from causing the FAULT pin to assert.
**Note:** This register must be written twice in succession for changes to take effect.
|Register|FAULT_CONFIG_MASK|FAULT_CONFIG_MASK|FAULT_CONFIG_MASK|FAULT_CONFIG_MASK|FAULT_CONFIG_MASK|FAULT_CONFIG_MASK|FAULT_CONFIG_MASK|FAULT_CONFIG_MASK|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|0|0|0|0|0|
Bit[7]: Temperature, prevent temperature faults from asserting the FAULT pin
Bit[6]: PVIN, prevent PVIN faults from asserting the FAULT pin
Bit[5]: VOUT, prevent VOUT faults from asserting the FAULT pin
Bit[4]: IOUT, prevent IOUT faults from asserting the FAULT pin
Bit[3]: CLOCK, prevent CLOCK faults from asserting the FAULT pin Bit[2]: OFF (DA_ENABLE), prevent turning off the part from asserting the FAULT pin Bit[1]: VCC, prevent VCC faults from asserting the FAULT pin
Bit[0]: Loss of lock, prevent loss of lock faults from asserting the FAULT pin
Data Sheet
DS60001915A - 63
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **FAULT_BUS_LATCH_SEL (0x7A)**
This register selects which faults will latch, requiring and EN cycle or power cycle to reset **Note:** This register must be written twice in succession for changes to take effect.
|Register|FAULT_BUS_LATCH_SEL|FAULT_BUS_LATCH_SEL|FAULT_BUS_LATCH_SEL|FAULT_BUS_LATCH_SEL|FAULT_BUS_LATCH_SEL|FAULT_BUS_LATCH_SEL|FAULT_BUS_LATCH_SEL|FAULT_BUS_LATCH_SEL|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|1|1|0|0|0|0|0|0|
Bit[7]: CB_UV_OV Bit[6]: OVP Bit[5]: VOUT_UV Bit[4]: TON_MAX Bit[3]: Overcurrent Bit[2]: Over temperature Bit[1]: PVIN_OV
Bit[0]: PVIN_UV
## **TON_DELAY_LOWER (0x7B)**
For a description of this register contents, see the TON_DELAY command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x7C.
## **TON_DELAY_UPPER (0x7C)**
For a description of this register contents, see the TON_DELAY command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x7B.
## **TON_RISE_LOWER (0x7D)**
For a description of this register contents, see the TON_RISE command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x7E.
## **TON_RISE_UPPER (0x7E)**
For a description of this register contents, see the TON_RISE command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x7D.
## **TON_MAX_FAULT_LIMIT_LOWER (0x7F)**
For a description of this register contents, see the TON_MAX_FAULT_LIMIT command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x80.
## **TON_MAX_FAULT_LIMIT_UPPER (0x80)**
For a description of this register contents, see the TON_MAX_FAULT_LIMIT command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x7F.
## **TON_MAX_FAULT_RESPONSE (0x81)**
For a description of this register contents, see the TON_MAX_FAULT_RESPONSE command in the PMBus Commands section.
**Note:** This register must be written twice in succession for changes to take effect.
Data Sheet
DS60001915A - 64
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **TOFF_DELAY_LOWER (0x82)**
For a description of this register contents, see the TOFF_DELAY command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x83.
## **TOFF_DELAY_UPPER (0x83)**
For a description of this register contents, see the TOFF_DELAY command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x82.
## **TOFF_FALL_LOWER (0x84)**
For a description of this register contents, see the TOFF_FALL command in the PMBus Commands section. This register contains the low byte of the data for that command. This register requires an atomic write with register 0x85.
## **TOFF_FALL_UPPER (0x85)**
For a description of this register contents, see the TOFF_FALL command in the PMBus Commands section. This register contains the high byte of the data for that command. This register requires an atomic write with register 0x84.
## **MFR_ID_COUNT (0x86)**
|Register|MFR_ID_COUNT|MFR_ID_COUNT|MFR_ID_COUNT|MFR_ID_COUNT|MFR_ID_COUNT|MFR_ID_COUNT|MFR_ID_COUNT|MFR_ID_COUNT|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|0|0|0|1|1|
This register does not have a direct PMBus counterpart but is used in the PMBus MFR_ID command. This command is a SMBus block read or a SMBus block write command. This register holds the byte count for these SMBus transactions. Note that there are only 3 data bytes available for the MFR_ID command data.
## **MFR_ID_1 (0x87)**
This register contains the first byte used in the PMBus MFR_ID command.
## **MFR_ID_2 (0x88)**
This register contains the second byte (if used) in the PMBus MFR_ID command.
## **MFR_ID_3 (0x89)**
This register contains the third byte (if used) in the PMBus MFR_ID command.
## **MFR_MODEL_COUNT (0x8A)**
|Register|MFR_MODEL_COUNT|MFR_MODEL_COUNT|MFR_MODEL_COUNT|MFR_MODEL_COUNT|MFR_MODEL_COUNT|MFR_MODEL_COUNT|MFR_MODEL_COUNT|MFR_MODEL_COUNT|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|0|0|0|0|1|
This register does not have a direct PMBus counterpart but is used in the PMBus MFR_ID command. This command is a SMBus block read or a SMBus block write command. This register holds the byte count for these SMBus transactions. Note that there is only 1 data byte available for the MFR_MODEL command.
## **MFR_MODEL (0x8B)**
This register contains the byte used in the PMBus MFR_MODEL command.
Data Sheet
DS60001915A - 65
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **MFR_REVISION_COUNT (0x8C)**
|Register|MFR_REVISION_COUNT|MFR_REVISION_COUNT|MFR_REVISION_COUNT|MFR_REVISION_COUNT|MFR_REVISION_COUNT|MFR_REVISION_COUNT|MFR_REVISION_COUNT|MFR_REVISION_COUNT|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|0|0|0|0|1|
This register does not have a direct PMBus counterpart but is used in the PMBus MFR_REVISION command. This command is a SMBus block read or a SMBus block write command. This register holds the byte count for these SMBus transactions. Note that there is only 1 data byte available for the MFR_MODEL command data.
## **MFR_REVISION (0x8D)**
This register contains the byte used in the PMBus MFR_REVISION command.
## **FAULT_PIN (0x90)**
|Register|FAULT_PIN|FAULT_PIN|FAULT_PIN|FAULT_PIN|FAULT_PIN|FAULT_PIN|FAULT_PIN|FAULT_PIN|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|Reserved|Reserved|Reserved|Reserved|Reserved|R/W|Reserved|Reserved|
|Default|0|0|0|0|0|0|0|0|
Bits[7:3] Reserved
Bit[2]:
- 0: Act on FAULT pin signal
- 1: Ignore FAULT pin signal
Bits[1:0] Reserved
## **BUS_VOLTAGE (0x91)**
|Register|BUS_VOLTAGE|BUS_VOLTAGE|BUS_VOLTAGE|BUS_VOLTAGE|BUS_VOLTAGE|BUS_VOLTAGE|BUS_VOLTAGE|BUS_VOLTAGE|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|Reserved|Reserved|Reserved|R/W|R/W|R/W|Reserved|Reserved|
|Default|1|1|1|0|1|0|0|0|
This register sets the bus voltage for the I[2] C bus, PLL mode and power good behavior. Bit [4]:
- 0: Enable PLL, Mode B
- 1: Disable PLL, Mode A (default)
Bit [3]:
- 0: Power Good based on POWER_GOOD_ON command value
- 1: Power Good based on DAC (default)
Bit [2]:
- 0: 1.8V to 2.5V I[2] C bus voltage (default)
1: 3.3V to 5V I[2] C bus voltage
All other bits are reserved.
Data Sheet
DS60001915A - 66
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **CB_OV_UV (0x94)**
|**CB_OV_UV**|**(0x94)**|**(0x94)**|**(0x94)**|**(0x94)**|**(0x94)**|**(0x94)**|**(0x94)**|**(0x94)**|
|---|---|---|---|---|---|---|---|---|
|Register|CB_OV_UV||||||||
|Bit|7|6|5|4|3|2|1|0|
|Access|Unused|Unused|Reserved|R/W|Reserved|Reserved|Reserved|Reserved|
|Default|—|—|0|1|0|0|0|1|
This register is used to enable the OV and UV functions for the CB capacitor.
Bit[4]: CB_OV_UV_ENABLE
0: CB OV/UV function disabled. Set to 0 for PVIN < 8V.
1: CB OV/UV function enabled. Set to 0 for PVIN > 8V, default.
## **CURRENT_REPORT_GAIN (0x95)**
|Register|CURRENT_REPORT_GAIN|CURRENT_REPORT_GAIN|CURRENT_REPORT_GAIN|CURRENT_REPORT_GAIN|CURRENT_REPORT_GAIN|CURRENT_REPORT_GAIN|CURRENT_REPORT_GAIN|CURRENT_REPORT_GAIN|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|1|0|0|0|0|0|0|0|
This register allows setting the gain for the reporting of output current. The resolution is 1/256 with 0 being a gain of 0 and 255 being a gain of 1.
## **VOUT_REPORT_GAIN (0x96)**
|Register|VOUT_REPORT_GAIN|VOUT_REPORT_GAIN|VOUT_REPORT_GAIN|VOUT_REPORT_GAIN|VOUT_REPORT_GAIN|VOUT_REPORT_GAIN|VOUT_REPORT_GAIN|VOUT_REPORT_GAIN|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|1|0|0|0|0|0|0|0|
This register allows setting the gain for the reporting of output voltage. The resolution is 1/256 with 0 being a gain of 0.5 and 255 being a gain of 1.5.
## **VOUT_REPORT_OFFSET (0x97)**
|Register|VOUT_REPORT_OFFSET|VOUT_REPORT_OFFSET|VOUT_REPORT_OFFSET|VOUT_REPORT_OFFSET|VOUT_REPORT_OFFSET|VOUT_REPORT_OFFSET|VOUT_REPORT_OFFSET|VOUT_REPORT_OFFSET|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|0|0|0|0|0|
This register allows setting the offset for the reporting of output voltage. The resolution is 1/1024.
## **PVIN_REPORT_GAIN (0x98)**
|Register|PVIN_REPORT_GAIN|PVIN_REPORT_GAIN|PVIN_REPORT_GAIN|PVIN_REPORT_GAIN|PVIN_REPORT_GAIN|PVIN_REPORT_GAIN|PVIN_REPORT_GAIN|PVIN_REPORT_GAIN|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|1|0|0|0|0|0|0|0|
This register allows setting the gain for the reporting of input voltage. The resolution is 1/256 with 0 being a gain of 0.5 and 255 being a gain of 1.5.
Data Sheet
DS60001915A - 67
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **PVIN_REPORT_OFFSET (0x99)**
|Register|PVIN_REPORT_OFFSET|PVIN_REPORT_OFFSET|PVIN_REPORT_OFFSET|PVIN_REPORT_OFFSET|PVIN_REPORT_OFFSET|PVIN_REPORT_OFFSET|PVIN_REPORT_OFFSET|PVIN_REPORT_OFFSET|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|0|0|0|0|0|
This register allows setting the offset for the reporting of input voltage. The resolution is 1/16.
## **TEMP_REPORT_GAIN (0x9A)**
|Register|TEMP_REPORT_GAIN|TEMP_REPORT_GAIN|TEMP_REPORT_GAIN|TEMP_REPORT_GAIN|TEMP_REPORT_GAIN|TEMP_REPORT_GAIN|TEMP_REPORT_GAIN|TEMP_REPORT_GAIN|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|1|0|0|0|0|0|0|0|
This register allows setting the gain for the reporting of device temperature. The resolution is 1/256.
## **TEMP_REPORT_OFFSET (0x9B)**
|Register|TEMP_REPORT_OFFSET|TEMP_REPORT_OFFSET|TEMP_REPORT_OFFSET|TEMP_REPORT_OFFSET|TEMP_REPORT_OFFSET|TEMP_REPORT_OFFSET|TEMP_REPORT_OFFSET|TEMP_REPORT_OFFSET|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|0|0|0|0|0|
This register allows setting the offset for the reporting of Device temperature. The resolution is 1°C.
## **NVM_CRC (0x9C)**
|Register|NVM_CRC|NVM_CRC|NVM_CRC|NVM_CRC|NVM_CRC|NVM_CRC|NVM_CRC|NVM_CRC|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|CRC_EN|
|Access|Unused|Unused|Unused|Unused|Unused|Reserved|Reserved|R/W|
|Default|—|—|—|—|—|0|0|0|
This register enables or disables a CRC function in the non-volatile memory. When enabled, two of the 12 banks of memory are used for each memory write. On a new part, this would leave 5 banks available for writing by the end user when enabled. If not enabled, a new part will have 11 banks available.
Bit [0]: CRC_ENABLE
0: CRC is disabled, default
1: CRC is enabled
## **BOOT_VOLTAGE_1_LOWER (0x9D)**
This register must be atomically written with register BOOT_VOLTAGE_1_UPPER
|Register|BOOT_VOLTAGE_1_LOWER|BOOT_VOLTAGE_1_LOWER|BOOT_VOLTAGE_1_LOWER|BOOT_VOLTAGE_1_LOWER|BOOT_VOLTAGE_1_LOWER|BOOT_VOLTAGE_1_LOWER|BOOT_VOLTAGE_1_LOWER|BOOT_VOLTAGE_1_LOWER|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|1|0|0|1|1|
This register along with register 0x9E set the default output voltage when the PS pin resistor is 6.34 kΩ. See the PS pin section for more details.
Data Sheet
DS60001915A - 68
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **BOOT_VOLTAGE_1_UPPER (0x9E)**
This register must be atomically written with register BOOT_VOLTAGE_1_LOWER
|Register|BOOT_VOLTAGE_1_UPPER|BOOT_VOLTAGE_1_UPPER|BOOT_VOLTAGE_1_UPPER|BOOT_VOLTAGE_1_UPPER|BOOT_VOLTAGE_1_UPPER|BOOT_VOLTAGE_1_UPPER|BOOT_VOLTAGE_1_UPPER|BOOT_VOLTAGE_1_UPPER|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|Unused|Unused|Unused|Unused|Unused|Unused|Unused|R/W|
|Default|0|0|0|0|0|0|0|0|
This register along with register 0x9D set the default output voltage when the PS pin resistor is 6.34 kΩ. See the PS pin section for more details.
## **BOOT_VOLTAGE_2_LOWER (0x9F)**
This register must be atomically written with register BOOT_VOLTAGE_2_UPPER.
|Register|BOOT_VOLTAGE_2_LOWER|BOOT_VOLTAGE_2_LOWER|BOOT_VOLTAGE_2_LOWER|BOOT_VOLTAGE_2_LOWER|BOOT_VOLTAGE_2_LOWER|BOOT_VOLTAGE_2_LOWER|BOOT_VOLTAGE_2_LOWER|BOOT_VOLTAGE_2_LOWER|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|1|0|0|0|1|1|0|0|
This register along with register 0xA0 set the default output voltage when the PS pin resistor is 7.15 kΩ. See the PS pin section for more details.
## **BOOT_VOLTAGE_2_UPPER (0xA0)**
This register must be atomically written with register BOOT_VOLTAGE_2_LOWER.
|Register|BOOT_VOLTAGE_2_UPPER|BOOT_VOLTAGE_2_UPPER|BOOT_VOLTAGE_2_UPPER|BOOT_VOLTAGE_2_UPPER|BOOT_VOLTAGE_2_UPPER|BOOT_VOLTAGE_2_UPPER|BOOT_VOLTAGE_2_UPPER|BOOT_VOLTAGE_2_UPPER|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|Unused|Unused|Unused|Unused|Unused|Unused|Unused|R/W|
|Default|0|0|0|0|0|0|0|0|
This register along with register 0x set the default output voltage when the PS pin resistor is 7.15 kΩ. See the PS pin section for more details.
## **BOOT_VOLTAGE_3_LOWER (0xA1)**
This register must be atomically written with register BOOT_VOLTAGE_3_UPPER.
|Register|BOOT_VOLTAGE_3_LOWER|BOOT_VOLTAGE_3_LOWER|BOOT_VOLTAGE_3_LOWER|BOOT_VOLTAGE_3_LOWER|BOOT_VOLTAGE_3_LOWER|BOOT_VOLTAGE_3_LOWER|BOOT_VOLTAGE_3_LOWER|BOOT_VOLTAGE_3_LOWER|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|1|0|0|1|1|
This register along with register 0xA2 set the default output voltage when the PS pin resistor is 7.87 kΩ. See the PS pin section for more details.
## **BOOT_VOLTAGE_3_UPPER (0xA2)**
This register must be atomically written with register BOOT_VOLTAGE_3_LOWER.
|Register|BOOT_VOLTAGE_3_UPPER|BOOT_VOLTAGE_3_UPPER|BOOT_VOLTAGE_3_UPPER|BOOT_VOLTAGE_3_UPPER|BOOT_VOLTAGE_3_UPPER|BOOT_VOLTAGE_3_UPPER|BOOT_VOLTAGE_3_UPPER|BOOT_VOLTAGE_3_UPPER|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|Unused|Unused|Unused|Unused|Unused|Unused|Unused|R/W|
|Default|0|0|0|0|0|0|0|0|
This register along with register 0xA1 set the default output voltage when the PS pin resistor is 7.87 kΩ. See the PS pin section for more details.
Data Sheet
DS60001915A - 69
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **BOOT_VOLTAGE_4_LOWER (0xA3)**
This register must be atomically written with register BOOT_VOLTAGE_4_UPPER.
|Register|BOOT_VOLTAGE_4_LOWER|BOOT_VOLTAGE_4_LOWER|BOOT_VOLTAGE_4_LOWER|BOOT_VOLTAGE_4_LOWER|BOOT_VOLTAGE_4_LOWER|BOOT_VOLTAGE_4_LOWER|BOOT_VOLTAGE_4_LOWER|BOOT_VOLTAGE_4_LOWER|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|1|0|0|1|1|
This register along with register 0xA4 set the default output voltage when the PS pin resistor is 8.66 kΩ. See the PS pin section for more details.
## **BOOT_VOLTAGE_4_UPPER (0xA4)**
This register must be atomically written with register BOOT_VOLTAGE_4_LOWER.
|Register|BOOT_VOLTAGE_4_UPPER|BOOT_VOLTAGE_4_UPPER|BOOT_VOLTAGE_4_UPPER|BOOT_VOLTAGE_4_UPPER|BOOT_VOLTAGE_4_UPPER|BOOT_VOLTAGE_4_UPPER|BOOT_VOLTAGE_4_UPPER|BOOT_VOLTAGE_4_UPPER|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|Unused|Unused|Unused|Unused|Unused|Unused|Unused|R/W|
|Default|0|0|0|0|0|0|0|0|
This register along with register 0xA3 set the default output voltage when the PS pin resistor is 8.66 kΩ. See the PS pin section for more details.
## **BOOT_VOLTAGE_5_LOWER (0xA5)**
This register must be atomically written with register BOOT_VOLTAGE_5_UPPER.
|Register|BOOT_VOLTAGE_5_LOWER|BOOT_VOLTAGE_5_LOWER|BOOT_VOLTAGE_5_LOWER|BOOT_VOLTAGE_5_LOWER|BOOT_VOLTAGE_5_LOWER|BOOT_VOLTAGE_5_LOWER|BOOT_VOLTAGE_5_LOWER|BOOT_VOLTAGE_5_LOWER|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|1|0|1|0|0|0|0|
This register along with register 0xA6 set the default output voltage when the PS pin resistor is 9.31 kΩ. See the PS pin section for more details.
## **BOOT_VOLTAGE_5_UPPER (0xA6)**
This register must be atomically written with register BOOT_VOLTAGE_5_LOWER.
|Register|BOOT_VOLTAGE_5_UPPER|BOOT_VOLTAGE_5_UPPER|BOOT_VOLTAGE_5_UPPER|BOOT_VOLTAGE_5_UPPER|BOOT_VOLTAGE_5_UPPER|BOOT_VOLTAGE_5_UPPER|BOOT_VOLTAGE_5_UPPER|BOOT_VOLTAGE_5_UPPER|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|Unused|Unused|Unused|Unused|Unused|Unused|Unused|R/W|
|Default|0|0|0|0|0|0|0|0|
This register along with register 0xA5 set the default output voltage when the PS pin resistor is 9.31 kΩ. See the PS pin section for more details.
## **BOOT_VOLTAGE_6_LOWER (0xA7)**
This register must be atomically written with register BOOT_VOLTAGE_6_UPPER.
|Register|BOOT_VOLTAGE_6_LOWER|BOOT_VOLTAGE_6_LOWER|BOOT_VOLTAGE_6_LOWER|BOOT_VOLTAGE_6_LOWER|BOOT_VOLTAGE_6_LOWER|BOOT_VOLTAGE_6_LOWER|BOOT_VOLTAGE_6_LOWER|BOOT_VOLTAGE_6_LOWER|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|1|0|0|0|1|1|0|
This register along with register 0xA8 set the default output voltage when the PS pin resistor is 10.2 kΩ. See the PS pin section for more details.
Data Sheet
DS60001915A - 70
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **BOOT_VOLTAGE_6_UPPER (0xA8)**
This register must be atomically written with register BOOT_VOLTAGE_6_LOWER.
|Register|BOOT_VOLTAGE_6_UPPER|BOOT_VOLTAGE_6_UPPER|BOOT_VOLTAGE_6_UPPER|BOOT_VOLTAGE_6_UPPER|BOOT_VOLTAGE_6_UPPER|BOOT_VOLTAGE_6_UPPER|BOOT_VOLTAGE_6_UPPER|BOOT_VOLTAGE_6_UPPER|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|Unused|Unused|Unused|Unused|Unused|Unused|Unused|R/W|
|Default|0|0|0|0|0|0|0|0|
This register along with register 0xA7 set the default output voltage when the PS pin resistor is 10.2 kΩ. See the PS pin section for more details.
## **BOOT_VOLTAGE_7_LOWER (0xA9)**
This register must be atomically written with register BOOT_VOLTAGE_7_UPPER.
|Register|BOOT_VOLTAGE_7_LOWER|BOOT_VOLTAGE_7_LOWER|BOOT_VOLTAGE_7_LOWER|BOOT_VOLTAGE_7_LOWER|BOOT_VOLTAGE_7_LOWER|BOOT_VOLTAGE_7_LOWER|BOOT_VOLTAGE_7_LOWER|BOOT_VOLTAGE_7_LOWER|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|1|1|1|0|1|1|
This register along with register 0xAA set the default output voltage when the PS pin resistor is 11 kΩ. See the PS pin section for more details.
## **BOOT_VOLTAGE_7_UPPER (0xAA)**
This register must be atomically written with register BOOT_VOLTAGE_7_LOWER.
|Register|BOOT_VOLTAGE_7_UPPER|BOOT_VOLTAGE_7_UPPER|BOOT_VOLTAGE_7_UPPER|BOOT_VOLTAGE_7_UPPER|BOOT_VOLTAGE_7_UPPER|BOOT_VOLTAGE_7_UPPER|BOOT_VOLTAGE_7_UPPER|BOOT_VOLTAGE_7_UPPER|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|Unused|Unused|Unused|Unused|Unused|Unused|Unused|R/W|
|Default|0|0|0|0|0|0|0|0|
This register along with register 0xA9 set the default output voltage when the PS pin resistor is 11 kΩ. See the PS pin section for more details.
## **BOOT_VOLTAGE_8_LOWER (0xAB)**
This register must be atomically written with register BOOT_VOLTAGE_8_UPPER.
|Register|BOOT_VOLTAGE_8_LOWER|BOOT_VOLTAGE_8_LOWER|BOOT_VOLTAGE_8_LOWER|BOOT_VOLTAGE_8_LOWER|BOOT_VOLTAGE_8_LOWER|BOOT_VOLTAGE_8_LOWER|BOOT_VOLTAGE_8_LOWER|BOOT_VOLTAGE_8_LOWER|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|1|0|1|0|0|0|
This register along with register 0xAC set the default output voltage when the PS pin resistor is 12.1 kΩ. See the PS pin section for more details.
## **BOOT_VOLTAGE_8_UPPER (0xAC)**
This register must be atomically written with register BOOT_VOLTAGE_8_LOWER.
|Register|BOOT_VOLTAGE_8_UPPER|BOOT_VOLTAGE_8_UPPER|BOOT_VOLTAGE_8_UPPER|BOOT_VOLTAGE_8_UPPER|BOOT_VOLTAGE_8_UPPER|BOOT_VOLTAGE_8_UPPER|BOOT_VOLTAGE_8_UPPER|BOOT_VOLTAGE_8_UPPER|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|Unused|Unused|Unused|Unused|Unused|Unused|Unused|R/W|
|Default|0|0|0|0|0|0|0|0|
This register along with register 0xAB set the default output voltage when the PS pin resistor is 12.1 kΩ. See the PS pin section for more details.
Data Sheet
DS60001915A - 71
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **STATUS_VOUT (0xC0)**
For a description of this register contents, see the STATUS_VOUT command in the PMBus Commands section.
## **STATUS_IOUT (0xC1)**
For a description of this register contents, see the STATUS_IOUT command in the PMBus Commands section.
## **STATUS_INPUT (0xC2)**
For a description of this register contents, see the STATUS_INPUT command in the PMBus Commands section.
## **STATUS_TEMPERATURE (0xC3)**
For a description of this register contents, see the STATUS_TEMPERATURE command in the PMBus Commands section.
## **STATUS_CML (0xC4)**
For a description of this register contents, see the STATUS_CML command in the PMBus Commands section.
## **STATUS_BYTE (0xC6)**
For a description of this register contents, see the STATUS_BYTE command in the PMBus Commands section.
## **STATUS_WORD_HIGH (0xC7)**
For a description of this register contents, see the STATUS_WORD command in the PMBus Commands section. This register is the high byte of that command.
## **BURN_OTP (0xC9)**
|**BURN_OTP**|**(0xC9)**|**(0xC9)**|**(0xC9)**|**(0xC9)**|**(0xC9)**|**(0xC9)**|**(0xC9)**|**(0xC9)**|
|---|---|---|---|---|---|---|---|---|
|Register|BURN_OTP||||||||
|Bit|7|6|5|4|3|2|1|0|
|Access|Unused|Unused|Unused|Unused|Unused|Unused|R/W|Reserved|
|Default|0|0|0|0|0|0|0|0|
Bits[7:2] – unused
Bit[1] – set to 1 to burn the OTP
Bit[0] – reserved
## **CLEAR_STATUS (0xCC)**
|Register|CLEAR_STATUS|CLEAR_STATUS|CLEAR_STATUS|CLEAR_STATUS|CLEAR_STATUS|CLEAR_STATUS|CLEAR_STATUS|CLEAR_STATUS|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|Unused|Unused|Unused|Unused|Unused|Reserved|Reserved|R/W|
|Default|0|0|0|0|0|0|1|0|
Bits[7:3] – unused Bits[2:1] – reserved
Bit[0] – set to 1 to clear the status flags
## **PVIN_REPORT_LOWER (0xD2)**
For a description of this register contents, see the READ_VIN command in the PMBus Commands section. This register contains the low byte of the data for that command.
## **PVIN_REPORT_UPPER (0xD3)**
For a description of this register contents, see the READ_VIN command in the PMBus Commands section. This register contains the high byte of the data for that command.
Data Sheet
DS60001915A - 72
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **IOUT_REPORT_LOWER (0xD4)**
For a description of this register contents, see the READ_IOUT command in the PMBus Commands section. This register contains the low byte of the data for that command.
## **IOUT_REPORT_UPPER (0xD5)**
For a description of this register contents, see the READ_IOUT command in the PMBus Commands section. This register contains the high byte of the data for that command.
## **VOUT_REPORT_LOWER (0xD6)**
For a description of this register contents, see the READ_VOUT command in the PMBus Commands section. This register contains the low byte of the data for that command.
## **VOUT_REPORT_UPPER (0xD7)**
For a description of this register contents, see the READ_VOUT command in the PMBus Commands section. This register contains the high byte of the data for that command.
## **TEMP_REPORT_LOWER (0xD8)**
For a description of this register contents, see the READ_TEMPERATURE command in the PMBus Commands section. This register contains the low byte of the data for that command.
## **TEMP_REPORT_UPPER (0xD9)**
For a description of this register contents, see the READ_TEMPERATURE command in the PMBus Commands section. This register contains the high byte of the data for that command.
## **VCC_REPORT_LOWER (0xDA)**
|Register|VCC_REPORT_LOWER|VCC_REPORT_LOWER|VCC_REPORT_LOWER|VCC_REPORT_LOWER|VCC_REPORT_LOWER|VCC_REPORT_LOWER|VCC_REPORT_LOWER|VCC_REPORT_LOWER|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R|R|R|R|R|R|R|R|
|Default|—|—|—|—|—|—|—|—|
This register contains the low byte of a linear 11 format representation of the VCC voltage of the part.
## **VCC_REPORT_UPPER (0xDB)**
|Register|VCC_REPORT_UPPER|VCC_REPORT_UPPER|VCC_REPORT_UPPER|VCC_REPORT_UPPER|VCC_REPORT_UPPER|VCC_REPORT_UPPER|VCC_REPORT_UPPER|VCC_REPORT_UPPER|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R|R|R|R|R|R|R|R|
|Default|—|—|—|—|—|—|—|—|
This register contains the high byte of a linear 11 format representation of the VCC voltage of the part. The exponent for this calculation, with a value of -5, is in bits [7:3].
Data Sheet
DS60001915A - 73
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **NCL_INDICATION (0xF0)**
|Register|NCL_INDICATION|NCL_INDICATION|NCL_INDICATION|NCL_INDICATION|NCL_INDICATION|NCL_INDICATION|NCL_INDICATION|NCL_INDICATION|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|Unused|Unused|Unused|Unused|Unused|R|R|R|
|Default|—|—|—|—|1|0|0|—|
This register shows a negative current limit indication for each of the two phases and the high bit of the actual reference DAC.
Bits[7:3]: Unused
Bit[2]: NCL for phase 1
Bit[1]: NCL for phase 2
Bit[0]: High bit for the reference DAC
## **DAC_CODE (0xF1)**
|**DAC_CODE**|**(0xF1)**|**(0xF1)**|**(0xF1)**|**(0xF1)**|**(0xF1)**|**(0xF1)**|**(0xF1)**|**(0xF1)**|
|---|---|---|---|---|---|---|---|---|
|Register|DAC_CODE||||||||
|Bit|7|6|5|4|3|2|1|0|
|Access|R|R|R|R|R|R|R|R|
|Default|—|—|—|—|—|—|—|—|
This register shows the lower 8 bits of the reference DAC.
Bits{7:0]: Low 8 bits of the reference DAC
## **USER_OTP_POINTER (0xF2)**
|Register|USER_OTP_POINTER|USER_OTP_POINTER|USER_OTP_POINTER|USER_OTP_POINTER|USER_OTP_POINTER|USER_OTP_POINTER|USER_OTP_POINTER|USER_OTP_POINTER|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R|R|R|R|Reserved|Reserved|Reserved|Reserved|
|Default|1|0|1|1|—|—|—|—|
Bits[7:4] 0001: 1 write remaining 0010: 2 writes remaining 0011: 3 writes remaining 0100: 4 writes remaining 0101: 5 writes remaining 0110: 6 writes remaining 0111: 7 writes remaining 1000: 8 writes remaining 1001: 9 writes remaining 1010: 10 writes remaining 1011: 11 writes remaining, default for a new part 1100: 12 writes remaining
Data Sheet
DS60001915A - 74
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **STATUS (0xF3)**
|Register|STATUS|STATUS|STATUS|STATUS|STATUS|STATUS|STATUS|STATUS|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R|R|R|R|R|R|R|R|
|Default|0|0|0|0|0|0|0|0|
This register shows the status flags for the part.
Bit [7]: Power Good status
Bit [6]: Overvoltage status Bit [5]: Overcurrent status Bit [4]: Temperature status Bit [3]: Enable pin status Bit [2]: Not used
Bit [1]: User NVM write status
Bit [0]: Status cleared indicator. This is a mirror of register 0xCC, bit 0.
## **IC_REV_BYTE_COUNT (0xF4)**
|Register|IC_REV_BYTE_COUNT|IC_REV_BYTE_COUNT|IC_REV_BYTE_COUNT|IC_REV_BYTE_COUNT|IC_REV_BYTE_COUNT|IC_REV_BYTE_COUNT|IC_REV_BYTE_COUNT|IC_REV_BYTE_COUNT|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R|R|R|R|R|R|R|R|
|Default|0|0|0|0|0|0|0|1|
This register does not have a direct PMBus counterpart but is used in the PMBus IC_DEVICE_REV command. This command is a SMBus block read or a SMBus block write command. This register holds the byte count for these SMBus transactions. Note that there is only 1 data byte available for the IC_DEVICE_REV command.
## **IC_REV (0xF5)**
This register contains the byte used in the PMBus IC_DEVICE_REV command.
|Register|IC_REV|IC_REV|IC_REV|IC_REV|IC_REV|IC_REV|IC_REV|IC_REV|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|0|0|0|0|0|
|**IC_DEV_ID_COUNT (0xF6)**|||||||||
|Register|IC_DEV_ID_COUNT||||||||
|Bit|7|6|5|4|3|2|1|0|
|Access|R|R|R|R|R|R|R|R|
|Default|0|0|0|0|0|0|0|1|
This register does not have a direct PMBus counterpart but is used in the PMBus IC_DEVICE_ID command. This command is a SMBus block read or a SMBus block write command. This register holds the byte count for these SMBus transactions. Note that there is only 1 data byte available for the IC_DEVICE_REV command.
Data Sheet
DS60001915A - 75
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Register List**
## **IC_DEV_ID (0xF7)**
This register contains the byte used in the PMBus IC_DEVICE_ID command.
|Register|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|IC_DEV_ID|
|---|---|---|---|---|---|---|---|---|
|Bit|7|6|5|4|3|2|1|0|
|Access|R/W|R/W|R/W|R/W|R/W|R/W|R/W|R/W|
|Default|0|0|0|1|1|0|0|1|
Data Sheet
DS60001915A - 76
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Programming the OTP**
## **9. Programming the OTP**
1. Write all registers with desired values and save these values for later comparison.
2. Pulle the EN pin low (or high, depending on the polarity value set in the ON_OFF_CONFIG register) to disable switching.
3. Read register USER_OTP_POINTER (0xF2) to determine the number of remaining writes.
4. If there is a bank remaining, apply 7.5V (±250 mV) to the VIN pin. If there is not a bank remaining, the part cannot be written with new values.
5. Write a 0 then a 1 to the register BURN_OTP (0xC9), bit[1].
6. Read the STATUS register (0xF3) and check bit[1]. If the bit is set, the write was successful. If not, the write was not successful.
7. If the write was successful, power cycle the part.
8. Read all programmed registers and compare to the values saved in step 1.
9. If steps 6 or 8 fail, repeat the process.
10. If there is a second failure of steps 6 or 8, discard the part.
Data Sheet
DS60001915A - 77
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Protocols**
## **10. Protocols**
|**Protocols**|||
|---|---|---|
|S = Start Bit|W = Write Bit, 0|White Background = Sent by Host|
|P = Stop Bit|R = Read Bit, 1||
|A = ACK|Sr = Repeated Start Bit|Grey Background = Sent by MCPF1525M06|
|N = NACK|||
**Figure 10-1.** I[2] C Protocols
I2C Write 1 7 1 1 8 1 8 1 1 S Client Address W A Register Address A Data Byte A P
I2C Read
|I2C Read|I2C Read|I2C Read|I2C Read|I2C Read|I2C Read|I2C Read|I2C Read|I2C Read|I2C Read|I2C Read|I2C Read|I2C Read|
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|1<br>7<br>1<br>1<br>8<br>1<br>1<br>7<br>1<br>1<br>8<br>1<br>1|||||||||||||
|S|Client Address|W|A|Register Address|A|Sr|Client Address|R|A|Data Byte|N|P|
|S<br>Client Address<br>W<br>A<br>Command Code<br>A<br>P<br>PMBus Send Byte<br>1<br>7<br>1<br>1<br>8<br>1<br>1|||||||||||||
|S|Client Address|W|A|Command Code|A|P|||||||
PMBus Write Byte 1 7 1 1 8 1 8 1 1 S Client Address W A Command Code A Data Byte A P PMBus Write Word 1 7 1 1 8 1 8 8 1 1 S Client Address W A Command Code A Data Byte Lo Data Byte Hi A P PMBus Read Byte 1 7 1 1 8 1 1 7 1 1 8 1 1 S Client Address W A Command Code A Sr Client Address R A Data Byte N P PMBus Read Word 1 7 1 1 8 1 1 7 1 1 8 1 S Client Address W A Command Code A Sr Client Address R A Data Byte Lo A ... 8 1 1 ... Data Byte Hi N P PMBus Block Read 1 7 1 1 8 1 S Client Address W A Command Code A ... 1 7 1 1 8 1 8 1 ... Sr Client Address R A Block Count = N A Data Byte 1 A ... 8 1 8 1 1 ... Data Byte 2 A ... Data Byte N N P
Data Sheet
DS60001915A - 78
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Packaging Information**
## **11. Packaging Information Package Marking Information**
Package type:
**==> picture [137 x 122] intentionally omitted <==**
**----- Start of picture text -----**<br>
MCPF<br>1525<br>NNNNNN<br>YYWW<br>**----- End of picture text -----**<br>
Example:
**==> picture [137 x 122] intentionally omitted <==**
**----- Start of picture text -----**<br>
MCPF<br>1525<br>23F5E1<br>2545<br>**----- End of picture text -----**<br>
**==> picture [468 x 172] intentionally omitted <==**
**Legend:** XX...X Product Code or Customer-specific information Y Year code (last digit of calendar year) YY Year code (last 2 digits of calendar year) WW Week code (week of January 1 is week ‘01’) NNN Alphanumeric traceability code e3 Pb-free JEDEC designator for Matte Tin (Sn) ***** This package is Pb-free. The Pb-free JEDEC designator ( e3 ) can be found on the outer packaging for this package. **Note** : In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. Package may or not include the corporate logo.
Data Sheet
DS60001915A - 79
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Packaging Information**
## **Pa** ~~**ckage Outline Drawing**~~
## **69-Lead Extra Thick Land Grid Array-SIP (8ZW) 7.65x6.8x4.02mm[B2LGA]**
**Note:** For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging
**==> picture [313 x 162] intentionally omitted <==**
**----- Start of picture text -----**<br>
D<br>E E1<br>1<br>(A1)<br>Ø3.10<br>A<br>Pick Area<br>TOP VIEW SIDE VIEW<br>**----- End of picture text -----**<br>
**==> picture [151 x 84] intentionally omitted <==**
**----- Start of picture text -----**<br>
D1<br>A2<br>**----- End of picture text -----**<br>
## END VIEW
**==> picture [405 x 185] intentionally omitted <==**
**----- Start of picture text -----**<br>
3.500 3.500<br>15 (0.25x0.60) 18 (0.25x0.45) 0.30<br>e **<br>13 (0.20x2.00)** 2 (0.25x0.30)<br>0.35<br>0.25<br>1 0.400<br>3.000 2.00<br>1.250<br>0.20<br>2.400<br>3.075<br>e<br>2.000 2.000<br>9 (0.25x0.45)<br>6 (1.60x0.25)<br>6 (0.25x1.80)<br>BOTTOM VIEW<br>**----- End of picture text -----**<br>
Microchip Technology Drawing C04-00678 Rev A Sheet 1 of 2
Data Sheet
DS60001915A - 80
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Packaging Information**
## **69-Lead Extra Thick Land Grid Array-SIP (8ZW) 7.65x6.8x4.02mm[B2LGA]**
**Note:** For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging
||Units|Units|MILLIMETERS|MILLIMETERS|MILLIMETERS||
|---|---|---|---|---|---|---|
||Dimension Limits||MIN|NOM|MAX||
||Number of Terminals|N|69||||
||Pitch|e|0.50 BSC||||
||Overall Height|A|3.62|3.82|4.02||
||Package Base|A1|0.33 REF||||
||Component Height from Bottom|A2|0.73|0.93|1.13||
||Overall Length|D|7.65 BSC||||
||Inductor Length|D1|6.10 BSC||||
||Overall Width|E|6.80 BSC||||
||Inductor Width|E1|6.00 BSC||||
Notes:
1. The Pin 1 visual index feature may vary, but it must be located within the hatched area. 2. The package is saw singulated. 3. Dimensioning and tolerancing per ASME Y14.5M BSC: Basic Dimension. The theoretically exact value is shown without tolerances. REF: Reference Dimension, usually without tolerances, is for information purposes only.
Microchip Technology Drawing C04-00678 Rev A Sheet 2 of 2
Data Sheet
DS60001915A - 81
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Packaging Information**
## **69-Lead Extra Thick Land Grid Arrray-SIP (8ZW) 7.65x6.8x4.02mm[B2LGA]**
**==> picture [341 x 295] intentionally omitted <==**
**----- Start of picture text -----**<br>
3.500 3.500<br>3.775x2.10<br>2.738 0.500 TYP<br>1.30x2.10 13x (0.35x0.70)<br>1.500 1.238<br>0.775x2.10<br>Pin 1<br>3.000<br>1.250<br>0.400<br>0.650<br>2.400<br>3.075<br>0.500 TYP<br>2x (0.40x0.35)<br>2x (1.35x1.90)<br>18x (0.55x0.35) 1.000<br>2.000 5.70x0.85<br>9x (0.35x0.55)<br>**----- End of picture text -----**<br>
**Solder Mask**
**==> picture [352 x 268] intentionally omitted <==**
**----- Start of picture text -----**<br>
13x (0.20x2.00)<br>0.500 Typ. 15x (0.25x0.60)<br>Pin 1<br>0.500 Typ. 0.500 Typ.<br>3.000<br>1.250<br>0.400<br>2.400<br>3.075<br>6x (1.60x0.25)<br>18x (0.45x0.25)<br>2x (0.30x0.20)<br>9x (0.25x0.45)<br>0.500 Typ.<br>2.000 2.000 6x (0.25x1.80)<br>**----- End of picture text -----**<br>
**Solder Stencil**
Data Sheet
DS60001915A - 82
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06 Revision History**
## **12. Revision History**
|**Doc. Rev.**|**Date**|**Section**|**Comments**|
|---|---|---|---|
|A|January 2026|—|Initial release of MCPF1525M06 as Microchip document DS60001915A.|
Data Sheet
DS60001915A - 83
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06**
## **Product Identification System**
To order or obtain information, for example, on pricing or delivery, contact Microchip: https:// www.microchip.com/en-us/about/contact-us.
**PART NO. [T][(1)] –X /XXX Device Tape and Reel Temperature Package Range**
|**Device:**|MCPF1525M06: 16V, 25A Stackable Switching Buck Regulator Module|MCPF1525M06: 16V, 25A Stackable Switching Buck Regulator Module|
|---|---|---|
|**Tape & Reel Option(1):**|Blank|= Tube|
||T|= Tape and Reel|
|**Temperature Range:**|E|= −40°C to +125°C (Extended)|
|**Package:**|8ZW|= Extra Thick Land Grid Array (B2LGA), 69-Pin,7.65 × 6.8 × 3.9 mm|
Examples:
- MCPF1525M06T-E/8ZW: 16V, 25A Stackable Switching Buck Regulator Module, Tape and Reel, Extended Temperature, B2LGA 69-Pin Package
## **Notes:**
1. Tape and Reel identifier only appears in the catalog part number description. This identifier is used for ordering purposes and is not printed on the device package. Check with your Microchip Sales Office for package availability with the Tape and Reel option.
2. Small form-factor packaging options may be available. Please check www.microchip.com/ packaging for small-form factor package availability, or contact your local Sales Office.
## **Product Change Notification Service**
Microchip’s product change notification service helps keep customers current on Microchip products. Subscribers will receive email notification whenever there are changes, updates, revisions or errata related to a specified product family or development tool of interest.
To register, go to www.microchip.com/pcn and follow the registration instructions.
## **Microchip Information**
**==> picture [44 x 41] intentionally omitted <==**
## **Trademarks**
The “Microchip” name and logo, the “M” logo, and other names, logos, and brands are registered and unregistered trademarks of Microchip Technology Incorporated or its affiliates and/or subsidiaries in the United States and/or other countries (“Microchip Trademarks”). Information regarding Microchip Trademarks can be found at https://www.microchip.com/en-us/about/legalinformation/microchip-trademarks.
ISBN: 979-8-3371-2677-7
## **Legal Notice**
This publication and the information herein may be used only with Microchip products, including to design, test, and integrate Microchip products with your application. Use of this information in any other manner violates these terms. Information regarding device applications is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. Contact your local Microchip sales office for additional support or, obtain additional support at www.microchip.com/en-us/support/design-help/ client-support-services.
Data Sheet
DS60001915A - 84
© 2026 Microchip Technology Inc. and its subsidiaries
**MCPF1525M06**
THIS INFORMATION IS PROVIDED BY MICROCHIP “AS IS”. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE, OR WARRANTIES RELATED TO ITS CONDITION, QUALITY, OR PERFORMANCE.
IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL, OR CONSEQUENTIAL LOSS, DAMAGE, COST, OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE INFORMATION OR ITS USE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE FULLEST EXTENT ALLOWED BY LAW, MICROCHIP’S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY RELATED TO THE INFORMATION OR ITS USE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY, THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THE INFORMATION.
Use of Microchip devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights unless otherwise stated.
## **Microchip Devices Code Protection Feature**
Note the following details of the code protection feature on Microchip products:
- Microchip products meet the specifications contained in their particular Microchip Data Sheet.
- Microchip believes that its family of products is secure when used in the intended manner, within operating specifications, and under normal conditions.
- Microchip values and aggressively protects its intellectual property rights. Attempts to breach the code protection features of Microchip products are strictly prohibited and may violate the Digital Millennium Copyright Act.
- Neither Microchip nor any other semiconductor manufacturer can guarantee the security of its code. Code protection does not mean that we are guaranteeing the product is “unbreakable”. Code protection is constantly evolving. Microchip is committed to continuously improving the code protection features of our products.
Data Sheet © 2026 Microchip Technology Inc. and its subsidiaries
DS60001915A - 85
Updated at April 10, 2026
Microchip Technology Inc. is a leading global provider of smart, connected, and secure embedded control solutions. Known for enabling engineers to design with confidence, the company delivers a comprehensive product portfolio that reduces total system costs and accelerates time to market across the industrial, automotive, communications, and computing sectors. Our extensive selection of Microchip components highlights the manufacturer's strength in both discrete semiconductors and advanced wireless connectivity. We carry a robust lineup of highly efficient single MOSFETs and Schottky diodes tailored for demanding power management and switching applications. Alongside these essential discretes, engineers can source a wide array of ready-to-use networking modules, prominently featuring Bluetooth and WLAN adapters that streamline the development of modern IoT and connected devices. Rounding out the offering is a diverse range of Microchip integrated circuits and specialized components. This includes versatile I/O expanders for simplified system integration, precision timing solutions such as MEMS oscillators and pulse generators, as well as AC/DC LED driver ICs and sub-2.4GHz RF transceivers. Backed by Microchip's renowned commitment to exceptional quality and reliable performance, these components provide scalable, dependable building blocks for complex electronic designs.
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