# Non Isolated POL DC/DC Converter, Industrial, uSLIC-10, Module, 1 Output, 3.3 V, 300 mA

![Product image](https://novapart.co/image/farnell:3582109/)

**URL**: https://novapart.co/products/MAXM17901AMB+T/non-isolated-pol-dc-converter-industrial-uslic-10
**SKU**: MAXM17901AMB+T
**Manufacturer**: ANALOG DEVICES
**Category**: Power & Line Protection || Power Supplies || DC / DC Converters || DC / DC Non Isolated Board Mount Converters - Fixed Output
**Price**: €3.7400
**Stock**: 10+
**Lead Time**: 204 days (indicative)

## Specifications

| Parameter | Value |
|---|---|
| Msl | MSL 3 - 168 hours |
| Svhc | No SVHC (04-Feb-2026) |
| Depth | 2.6mm |
| Width | 3mm |
| Height | 1.5mm |
| No. Of Pins | 10Pins |
| Product Range | MAXM17901 Series |
| No. Of Outputs | 1 Output |
| Output Current | 300mA |
| Output Power Max | - |
| Input Voltage Max | 24V |
| Input Voltage Min | 4.5V |
| Output Current Max | 300mA |
| Output Voltage Nom | 3.3V |
| Switching Frequency | 500kHz |
| Input Voltage Dc Max | 24V |
| Input Voltage Dc Min | 4.5V |
| Dc / Dc Converter Type | uSLIC-10, Module |
| Dc / Dc Converter Ic Case | uSLIC |
| Operating Temperature Max | 125°C |
| Power Supply Applications | Industrial |
| Dc / Dc Converter Mounting | Surface Mount Device |
| Dc / Dc Converter Output Type | Fixed |

## Datasheet

📄 [Download PDF](https://novapart.co/datasheet/farnell:3582109/)

**EVALUATION KIT AVAILABLE** 

_Click_ _**here** for production status of specific part numbers._ 

## **MAXM17901/MAXM17903** 

## **General Description** 

The Himalaya series of voltage regulator ICs and power modules enable cooler, smaller, and simpler powersupply solutions. The MAXM17901/MAXM17903 are a family of high-efficiency, synchronous step-down DC-DC modules with integrated controller, MOSFETs, compensation components, and inductor that operate over a wide input-voltage range. The modules operate from 4.5V to 24V input and deliver up to 300mA output current. The MAXM17901 is a fixed 3.3V output modules. The MAXM17903 is an adjustable output (0.9V to 5V) module. The modules significantly reduce design complexity, manufacturing risks, and offer a true plug and play power/supply solution, reducing time-to-market. 

Both modules employ peak-current-mode control architecture. To reduce input inrush current, the modules offer a fixed 4.1ms soft-start time. 

The MAXM17901/03 modules are available in a low profile, compact 10-pin, 2.6mm × 3mm × 1.5mm, uSLIC™ package. 

## **Applications** 

- Industrial Sensors and Encoders 

- 4-20mA Current-Loop Powered Sensors 

- LDO Replacement 

- HVAC and Building Control 

## **4.5V to 24V, 300mA Himalaya uSLIC Step-Down Power Module** 

## **Benefits and Features** 

- Easy to Use 

   - Wide 4.5V to 24V Input 

   - Adjustable 0.9V to 5V Output 

   - Fixed 3.3V Output (MAXM17901) 

   - ±1.5% Feedback Accuracy 

   - Up to 300mA Output-Current 

   - Internally Compensated 

   - All Ceramic Capacitors 

- High Efficiency 

   - Selectable PWM- or PFM-Mode of Operation 

   - Shutdown Current as Low as 2.2μA (typ) 

- Flexible Design 

   - Internal Soft-Start and Prebias Startup 

   - Open-Drain Power Good Output ( RESET Pin) 

   - Programmable EN/UVLO Threshold 

- Robust Operation 

   - Hiccup Overcurrent Protection 

   - Overtemperature Protection 

   - -40°C to +125°C Ambient Operating Temperature/ -40°C to +150°C Junction Temperature 

## ● Rugged 

   - Complies with CISPR22(EN55022) Class B Conducted and Radiated Emissions 

   - Passes Drop, Shock, and Vibration Standards: JESD22-B103, B104, B111 

- Battery-Powered Equipment 

- General Purpose Point-of-Load 

- USB Type-C Powered Loads 

## **Typical Application Circuit 2.5V** 

**==> picture [243 x 139] intentionally omitted <==**

**----- Start of picture text -----**<br>
VIN VOUT<br>12V 2.5V, 300mA<br>VIN OUT<br>COUT<br>1µFCIN 2.2MΩ R1 RESET GND 10µF 133kΩ R3<br>MAXM17903<br>EN/UVLO FB<br>R2 VCC LX R4<br>825kΩ  C1 75kΩ<br>1µF MODE<br>**----- End of picture text -----**<br>


_**Ordering Information** appears at end of data sheet._ 

_uSLIC is a trademark of Maxim Integrated Products, Inc._ 

## **Typical Application Circuit 3.3V** 

**==> picture [242 x 139] intentionally omitted <==**

**----- Start of picture text -----**<br>
VIN VOUT<br>12V 3.3V, 300mA<br>VIN OUT<br>COUT<br>CIN 10µF<br>1µF EN/UVLO GND<br>MAXM17901<br>RESET FB<br>VCC LX<br>C1<br>1µF MODE<br>**----- End of picture text -----**<br>


**==> picture [125 x 31] intentionally omitted <==**

_19-100225; Rev 1; 11/18_ 

## MAXM17901/MAXM17903 

## 4.5V to 24V, 300mA Himalaya uSLIC 

## Step-Down Power Module 

## **Absolute Maximum Ratings** 

VIN, EN/UVLO to GND ............................................-0.3V to 29V LX, OUT and GND .....................................-0.3V to (VIN + 0.3V) VCC, FB, RESET to GND ..........................................-0.3V to 6V MODE to GND .......................................... -0.3V to (VCC + 0.3V) Output Short-Circuit Duration ....................................Continuous 

Junction Temperature (Note 1) ........................................+150°C Storage Temperature Range ............................ -55°C to +125°C Lead temperature (soldering,10s) ...................................+260°C Soldering Temperature (reflow) .......................................+260°C 

_Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability._ 

## **Package Information** 

|**Package Information**|**Package Information**|
|---|---|
|**PACKAGE TYPE: 10-PIN uSLIC**||
|Package Code|M102A3+2|
|Outline Number|**21-100094**|
|Land Pattern Number|**90-100027**|
|**THERMAL RESISTANCE, FOUR-LAYER BOARD (Note 2)**||
|Junction to Ambient (θJA)|41.56 ºC/W|



For the latest package outline information and land patterns (footprints), go to **www.maximintegrated.com/packages** . Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. 

**Note 1:** Junction temperature greater than +125°C degrades operating lifetimes. **Note 2:** Package thermal resistance is measured on an evaluation board with natural convection. 

## **Electrical Characteristics** 

(VIN = VEN/UVLO = 12V, VGND = 0V, CVCC = 1μF, FB = 1V (MAXM17903), FB = 3.6V (MAXM17901), LX = MODE = RESET = OUT = unconnected; TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND, unless otherwise noted.) (Note 3) 

|**PARAMETER**|**SYMBOL**|**CONDITIONS**|**MIN**<br>**TYP**<br>**MAX**|**UNITS**|
|---|---|---|---|---|
|**INPUT SUPPLY (VIN)**|||||
|Input-Voltage Range|VIN||4.5<br>24|V|
|Input-Shutdown Current|IIN-SH|VEN/UVLO= 0V, shutdown mode|2.2<br>4|μA|
|Input-Supply Current|IQ-PFM|MODE = unconnected,<br>FB = 1.03 × VFB-REG|95<br>160|μA|
||IQ-PWM|Normal switching mode, VIN= 12V ,<br>MODE=0|3.2|mA|
|**ENABLE/UVLO (EN/UVLO)**|||||
|EN/UVLO Threshold|VENR|VEN/UVLOrising|1.19<br>1.215<br>1.28|V|
||VENF|VEN/UVLOfalling|1.06<br>1.09<br>1.16||
||VEN-TRUESD|VEN/UVLOfalling, true shutdown|0.75||
|EN/UVLO Input-Leakage<br>Current|IEN/UVLO|TA= +25°C|-100<br>+100|nA|
|**LDO (VCC)**|||||
|VCCOutput-Voltage Range|VCC|6V < VIN< 24V, 0mA < IVCC< 10mA|4.75<br>5<br>5.25|V|
|VCCCurrent Limit|IVCC-MAX|VCC= 4.3V|13<br>30<br>50|mA|



Maxim Integrated │ 2 

www.maximintegrated.com 

## MAXM17901/MAXM17903 

## 4.5V to 24V, 300mA Himalaya uSLIC Step-Down Power Module 

## **Electrical Characteristics (continued)** 

(VIN = VEN/UVLO = 12V, VGND = 0V, CVCC = 1μF, FB = 1V (MAXM17903), FB = 3.6V (MAXM17901), LX = MODE = RESET = OUT = unconnected; TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND, unless otherwise noted.) (Note 3) 

|**PARAMETER**|**SYMBOL**|**CONDITIONS**|**MIN**<br>**TYP**<br>**MAX**|**UNITS**|
|---|---|---|---|---|
|VCCDropout|VCC-DO|VIN= 4.5V, IVCC= 5mA|0.15<br>0.3|V|
|VCCUVLO|VCC-UVR|VCCrising|4.05<br>4.18<br>4.3|V|
||VCC-UVF|VCCfalling|3.7<br>3.8<br>3.95||
|**SOFT-START (SS)**|||||
|Soft-Start Time|tSS||3.8<br>4.1<br>4.4|ms|
|**FEEDBACK (FB)**|||||
|FB-Regulation Voltage|VFB-REG|MODE = GND, MAXM17903|0.887<br>0.90<br>0.913|V|
|||MODE = unconnected, MAXM17903|0.887<br>0.915<br>0.936||
|||MODE = GND, MAXM17901|3.25<br>3.30<br>3.35||
|||MODE = unconnected, MAXM17901|3.25<br>3.35<br>3.42||
|FB-Leakage Current|IFB|MAXM17903|-100<br>-25|nA|
|**TIMING**|||||
|Switching Frequency|fSW||465<br>500<br>535|kHz|
|FB Undervoltage Trip Level to<br>Cause Hiccup|||62.5<br>64.5<br>66.5|%|
|Hiccup Timeout|||131|ms|
|Minimum On-Time|tON-MIN||90<br>130|ns|
|Maximum Duty Cycle|DMAX|FB = 0.98 × FBREG|89<br>91.4<br>94|%|
|**RESET**|||||
|FB Threshold forRESET<br>Rising||FB rising|93.5<br>95.5<br>97.5|%|
|FB Threshold forRESET<br>Falling||FB falling|90<br>92<br>94|%|
|RESETDelay After FB<br>Reaches Rising Threshold|||2|ms|
|RESETOutput-Level Low||IRESET= 5mA|0.2|V|
|RESETOutput-Leakage<br>Current||VRESET = 5.5V, TA= +25°C|0.1|μA|
|**MODE**|||||
|MODE Internal Pullup<br>Resistor|||500|kΩ|
|**THERMAL SHUTDOWN**|||||
|Thermal-Shutdown<br>Threshold||Temperature rising|166|°C|
|Thermal-Shutdown Hysteresis|||10|°C|



**Note 3:** Electrical specifications are production tested at TA = +25°C. Specifications over the entire operating temperature range are guaranteed by design and characterization. 

Maxim Integrated │ 3 

www.maximintegrated.com 

## MAXM17901/MAXM17903 

## 4.5V to 24V, 300mA Himalaya uSLIC 

## Step-Down Power Module 

## **Typical Operating Characteristics** 

(VIN = VEN/UVLO = 12V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1, unless otherwise noted.) 

**==> picture [679 x 543] intentionally omitted <==**

**----- Start of picture text -----**<br>
MAXM17903 MAXM17903 MAXM17903<br>EFFICIENCY vs. LOAD CURRENT  EFFICIENCY vs. LOAD CURRENT  EFFICIENCY vs. LOAD CURRENT<br>100 ADJUSTABLE VOUT = 0.9V, PWM MODE toc01 100 ADJUSTABLE VOUT = 1.5V, PWM MODE toc02 100 ADJUSTABLE VOUT = 2.5V, PWM MODE toc03<br>90 90 90<br>80 80 80<br>70 70 70<br>60 60 VIN = 5V 60 VIN = 5V<br>50 50 50<br>40 VIN = 5V 40 VIN = 12V 40 VIN = 12V<br>30 30 30<br>VIN = 12V VIN = 20V VIN = 20V<br>20 20 20<br>10 10 10<br>0 0 0<br>0 30 60 90 120 150 180 210 240 270 300 0 30 60 90 120 150 180 210 240 270 300 0 30 60 90 120 150 180 210 240 270 300<br>LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA)<br>MAXM17903 MAXM17901 MAXM17903<br>EFFICIENCY vs. LOAD CURRENT  EFFICIENCY vs. LOAD CURRENT  EFFICIENCY vs. LOAD CURRENT<br>100 ADJUSTABLE VOUT = 3.3V, PWM MODE toc04 100 FIXED VOUT = 3.3V, PWM MODE toc05 100 ADJUSTABLE VOUT = 0.9V, PFM MODE toc06<br>90 90 90<br>80 80 80<br>70 70 70<br>60 VIN = 5.5V 60 VIN = 5.5V 60<br>50 VIN = 12V 50 VIN = 12V 50<br>40 VIN = 20V 40 VIN = 20V 40 VIN = 12V<br>VIN = 5V<br>30 30 30<br>20 20 20<br>10 10 10<br>0 0 0<br>0 30 60 90 120 150 180 210 240 270 300 0 30 60 90 120 150 180 210 240 270 300 1 10 100<br>LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA)<br>MAXM17903 MAXM17903 MAXM17903<br>EFFICIENCY vs. LOAD CURRENT EFFICIENCY vs. LOAD CURRENT EFFICIENCY vs. LOAD CURRENT<br>ADJUSTABLE VOUT = 1.5V, PFM MODE ADJUSTABLE VOUT = 2.5V, PFM MODE ADJUSTABLE VOUT = 3.3V, PFM MODE<br>100 toc07 100 toc08 100 toc09<br>VIN = 5.5V<br>90 90 VIN = 5V 90<br>80 80 80<br>70 70 70<br>60 60 60<br>50 VIN = 20V 50 50<br>40 VIN = 12V 40 40<br>30 VIN = 5V 30 VIN = 20V 30 VIN = 12V VIN = 20V<br>20 20 VIN = 12V 20<br>10 10 10<br>0 0 0<br>1 10 100 1 10 100 1 10 100<br>LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA)<br>(%) (%) (%)<br>EFFICIENCY EFFICIENCY EFFICIENCY<br>(%) (%) (%)<br>EFFICIENCY EFFICIENCY EFFICIENCY<br>(%) (%) (%)<br>EFFICIENCY EFFICIENCY EFFICIENCY<br>**----- End of picture text -----**<br>


Maxim Integrated │ 4 

www.maximintegrated.com 

## MAXM17901/MAXM17903 

## 4.5V to 24V, 300mA Himalaya uSLIC 

## Step-Down Power Module 

## **Typical Operating Characteristics (continued)** 

## 

(VIN = VEN/UVLO = 12V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1, unless otherwise noted.) 

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MAXM17901 MAXM17903 MAXM17903<br>EFFICIENCY vs. LOAD CURRENT OUTPUT VOLTAGE vs. LOAD CURRENT OUTPUT VOLTAGE vs. LOAD CURRENT<br>100 FIXED VOUT = 3.3V, PFM MODE toc10 0.904 ADJUSTABLE VOUT = 0.9V, PWM MODE toc11 ADJUSTABLE VOUT = 1.5V, PWM MODE toc12<br>90 VIN = 5.5V 0.903 1.508<br>80<br>0.902 VIN = 12V 1.504 VIN = 5V<br>70<br>60 0.901 1.500 VIN = 12V<br>50 0.900<br>1.496<br>40 0.899<br>30 VIN = 12V VIN = 20V 0.898 VIN = 5V 1.492 VIN = 20V<br>20<br>1.488<br>0.897<br>10<br>0 0.896 1.484<br>1 10 100 0 30 60 90 120 150 180 210 240 270 300 0 30 60 90 120 150 180 210 240 270 300<br>LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA)<br>MAXM17903 MAXM17903 MAXM17901<br>OUTPUT VOLTAGE vs. LOAD CURRENT OUTPUT VOLTAGE vs. LOAD CURRENT OUTPUT VOLTAGE vs. LOAD CURRENT<br>2.524 ADJUSTABLE VOUT = 2.5V, PWM MODE toc13 ADJUSTABLE VOUT = 3.3V, PWM MODE toc14 3.310 FIXED VOUT = 3.3V, PWM MODE toc15<br>3.308<br>2.518<br>3.304 3.308<br>2.5122.506 VIN = 20V VIN = 5V 3.300 VIN = 5.5V VIN = 12V VIN =20V<br>3.306<br>2.500 3.296<br>2.494<br>3.292 3.304<br>2.488 VIN = 12V 3.288 VIN = 12V VIN = 20V VIN = 5.5V<br>2.482 3.302<br>2.476 3.284<br>2.470 3.280 3.300<br>0 30 60 90 120 150 180 210 240 270 300 0 30 60 90 120 150 180 210 240 270 300 0 30 60 90 120 150 180 210 240 270 300<br>LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA)<br>MAXM17903 MAXM17903 MAXM17903<br>OUTPUT VOLTAGE vs. LOAD CURRENT  OUTPUT VOLTAGE vs. LOAD CURRENT  OUTPUT VOLTAGE vs. LOAD CURRENT<br>ADJUSTABLE VOUT = 0.9V, PFM MODE ADJUSTABLE VOUT = 1.5V, PFM MODE ADJUSTABLE VOUT = 2.5V, PFM MODE<br>toc16 1.55 toc17 toc18<br>2.58<br>0.934<br>1.54<br>0.925 VIN = 5V VIN = 5V 2.56 VIN = 20V<br>1.53<br>0.916 VIN = 12V VIN = 20V 2.54<br>1.52 2.52 VIN = 5V VIN = 12V<br>0.907 1.51 VIN = 12V<br>2.50<br>0.898 1.50 2.48<br>0.889 1.49 2.46<br>0.880 1.48 2.44<br>0 30 60 90 120 150 180 210 240 270 300 0 30 60 90 120 150 180 210 240 270 300 0 30 60 90 120 150 180 210 240 270 300<br>LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA)<br>(%)<br>EFFICIENCY<br>OUTPUT  VOLTAGE (V) OUTPUT  VOLTAGE (V)<br>OUTPUT  VOLTAGE (V) OUTPUT  VOLTAGE (V)<br>OUTPUT  VOLTAGE (V)<br>OUTPUT  VOLTAGE (V) OUTPUT  VOLTAGE (V) OUTPUT  VOLTAGE (V)<br>**----- End of picture text -----**<br>


Maxim Integrated │ 5 

www.maximintegrated.com 

## MAXM17901/MAXM17903 

## 4.5V to 24V, 300mA Himalaya uSLIC Step-Down Power Module 

## **Typical Operating Characteristics (continued)** 

## 

(VIN = VEN/UVLO = 12V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1, unless otherwise noted.) 

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MAXM17903 MAXM17901 MAXM17903 OUTPUT VOLTAGE RIPPLE<br>OUTPUT VOLTAGE vs. LOAD CURRENT  OUTPUT VOLTAGE vs. LOAD CURRENT  VIN = 12V, ADJUSTABLE VOUT = 1.5V,<br>ADJUSTABLE VOUT = 3.3V, PFM MODE toc19 FIXED VOUT = 3.3V, PFM MODE toc20 FULL LOAD, PWM MODE toc21<br>3.39 VIN = 5.5V   3.39 VIN = 5.5V<br>3.37 my Z| VIN = 12V OO 3.37 Pe PO a4<br>3.35 VIN = 20V 3.35<br>3.33 3.33 VOUT (AC) 10mV/div<br>3.31 ERGREREREe 3.31 VIN = 12V SERRE . ee<br>3.29 PPE EEE 3.29<br>VIN = 20V<br>3.27 3.27<br>PET LT ET TT YT PTT tT :<br>3.25 3.25<br>PET TTT ET TT PTT T TT TT TT |<br>0 30 60 90 120 150 180 210 240 270 300 0 30 60 90 120 150 180 210 240 270 300 2µs/div<br>LOAD CURRENT (mA) LOAD CURRENT (mA)<br>MAXM17903 OUTPUT VOLTAGE RIPPLE MAXM17901 OUTPUT VOLTAGE RIPPLE MAXM17903 INPUT VOLTAGE RIPPLE<br>VIN = 12V, ADJUSTABLE VOUT = 3.3V, VIN = 12V, FIXED VOUT = 3.3V, VIN = 12V, ADJUSTABLE VOUT = 1.5V,<br>FULL LOAD, PWM MODE toc22 PWM MODE , FULL LOAD toc23 FULL LOAD, PWM MODE toc24<br>VOUT (AC) 10mV/div VOUT (AC) 10mV/div VIN (AC) 100mV/div<br>VAAN ARAN p en<br>2µs/div 2µs/div 2µs/div<br>MAXM17903 LOAD TRANSIENT RESPONSE<br>MAXM17903 INPUT VOLTAGE RIPPLE MAXM17903 INPUT VOLTAGE RIPPLE<br>VIN = 12V, ADJUSTABLE VFULL LOAD, PWM MODEOUT = 3.3V, toc25 VINPWM MODE, FULL LOAD = 12V, FIXED VOUT = 3.3V, toc26 (LOAD CURRENT STEPPED FROM 5mA TO 150mA)VIN = 12V, ADJUSTABLE VOUT = 1.5V, PFM MODE toc27<br>VOUT (AC) 20mV/div<br>VIN (AC) 100mV/div VIN (AC) 100mV/div<br>IOUT 100mA/div<br>2µs/div 2µs/div 100µs/div<br>OUTPUT  VOLTAGE (V)<br>OUTPUT  VOLTAGE (V)<br>**----- End of picture text -----**<br>


Maxim Integrated │ 6 

www.maximintegrated.com 

## MAXM17901/MAXM17903 

## 4.5V to 24V, 300mA Himalaya uSLIC 

## Step-Down Power Module 

## **Typical Operating Characteristics (continued)** 

## 

(VIN = VEN/UVLO = 12V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1, unless otherwise noted.) 

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MAXM17903 LOAD TRANSIENT RESPONSE MAXM17903 LOAD TRANSIENT RESPONSE MAXM17903 LOAD TRANSIENT RESPONSE<br>VIN = 12V, ADJUSTABLE VOUT = 1.5V, PWM MODE VIN = 12V, ADJUSTABLE VOUT = 3.3V, PFM MODE VIN = 12V, ADJUSTABLE VOUT = 3.3V, PWM MODE<br>(LOAD CURRENT STEPPED FROM 150mA TO 300mA) toc28 (LOAD CURRENT STEPPED FROM 5mA TO 150mA) toc29 (LOAD CURRENT STEPPED FROM 150mA TO 300mA) toc30<br>VOUT (AC) 20mV/div 100mV/div VOUT (AC) 50mV/div<br>VOUT (AC)<br>100mA/div 100mA/div<br>IOUT IOUT 100mA/div IOUT<br>=55<br>100µs/div 100µs/div<br>100µs/div<br>MAXM17901 LOAD TRANSIENT RESPONSE MAXM17901 LOAD TRANSIENT RESPONSE MAXM17903 STARTUP THROUGH ENABLE<br>(LOAD CURRENT STEPPED FROM 5mA TO 150mA)VIN = 12V, FIXED VOUT = 3.3V, PWM MODE toc31 (LOAD CURRENT STEPPED FROM 150mA TO 300mA)VIN = 12V, FIXED VOUT = 3.3V, PWM MODE toc32 VIN = 12V, ADJUSTABLE VFULL LOAD, PWM MODEOUT = 1.5V,  toc33<br>5V/div<br>VOUT (AC) 50mV/div EN/UVLO<br>VOUT (AC) 100mV/div<br>LX 10V/div<br>1V/div<br>100mA/div<br>VOUT 5V/div<br>IOUT 100mA/div IOUT RESET<br>100µs/div 100µs/div 1ms/div<br>MAXM17903 SHUTDOWN THROUGH ENABLE MAXM17903 STARTUP THROUGH ENABLE MAXM17903 SHUTDOWN THROUGH ENABLE<br>VIN = 12V, ADJUSTABLE VFULL LOAD, PWM MODEOUT = 1.5V,  toc34 VIN = 12V, ADJUSTABLE VFULL LOAD, PWM MODEOUT = 3.3V, toc35 VIN = 12V, ADJUSTABLE VFULL LOAD, PWM MODEOUT = 3.3V, toc36<br>5V/div<br>EN/UVLO    5V/div EN/UVLO EN/UVLO 5V/div<br>LX 10V/div LX 10V/div LX 10V/div<br>2V/div<br>VOUT 1V/div VOUT 5V/div VOUT 2V/div<br>RESET 5V/div RESET RESET 5V/div<br>-<br>100µs/div 1ms/div 100µs/div<br>**----- End of picture text -----**<br>


Maxim Integrated │ 7 

www.maximintegrated.com 

## MAXM17901/MAXM17903 

## 4.5V to 24V, 300mA Himalaya uSLIC 

## Step-Down Power Module 

## **Typical Operating Characteristics (continued)** 

## 

(VIN = VEN/UVLO = 12V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1, unless otherwise noted.) 

**==> picture [495 x 506] intentionally omitted <==**

**----- Start of picture text -----**<br>
MAXM17903 STARTUP THROUGH ENABLE (2V PREBIAS) MAXM17903 STARTUP THROUGH ENABLE (2V PREBIAS) MAXM17901 STARTUP THROUGH ENABLE<br>VIN = 12V, ADJUSTABLE VNO LOAD, PWM MODEOUT = 3.3V, toc37 VIN = 12V, ADJUSTABLE VNO LOAD, PFM MODEOUT = 3.3V, toc38 VIN FULL LOAD, PWM MODE= 12V, FIXED VOUT = 3.3V, toc39<br>5V/div 5V/div 5V/div<br>EN/UVLO EN/UVLO EN/UVLO<br>LX 10V/div LX 10V/div LX 10V/div<br>2V/div 2V/div 2V/div<br>—<br>VOUT 5V/div VOUT 5V/div VOUT 5V/div<br>RESET RESET RESET<br>1ms/div 1ms/div 1ms/div<br>MAXM17901 SHUTDOWN THROUGH ENABLE MAXM17901 STARTUP THROUGH ENABLE (2V PREBIAS) MAXM17901 STARTUP THROUGH ENABLE (2V PREBIAS)<br>VIN = 12V, FIXED VOUT = 3.3V, VIN = 12V, FIXED VOUT = 3.3V, VIN = 12V, FIXED VOUT = 3.3V,<br>FULL LOAD, PWM MODE toc40 NO LOAD, PWM MODE toc41 NO LOAD, PFM MODE toc42<br>5V/div 5V/div<br>EN/UVLO 5V/div EN/UVLO  EN/UVLO<br>LX 10V/div LX 10V/div LX 10V/div<br>2V/div 2V/div<br>VOUT 2V/div VOUT 5V/div VOUT 5V/div<br>RESET 5V/div RESET RESET<br>aE:<br>100µs/div 1ms/div 1ms/div<br>MAXM17903  STARTUP THROUGH VIN MAXM17903 SHUTDOWN THROUGH VIN MAXM17903 STARTUP THROUGH VIN<br>VIN = 12V, ADJUSTABLE VOUT = 1.5V,  VIN  = 12V,ADJUSTABLE VOUT = 1.5V,  VIN = 12V, ADJUSTABLE VOUT = 3.3V,<br>FULL LOAD, PWM MODE toc43 FULL LOAD, PWM MODE toc44 FULL LOAD, PWM MODE toc45<br>10V/div 10V/div<br>VIN VIN 10V/div VIN<br>LX 10V/div LX 10V/div LX 10V/div<br>2V/div 2V/div<br>500mV/div<br>2V/div<br>VCC VCC 2V/div VCC<br>VOUT VOUT 500mV/div VOUT E elieeere<br>1ms/div 1ms/div 1ms/div<br>**----- End of picture text -----**<br>


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## MAXM17901/MAXM17903 

## 4.5V to 24V, 300mA Himalaya uSLIC 

## Step-Down Power Module 

## **Typical Operating Characteristics (continued)** 

## 

(VIN = VEN/UVLO = 12V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1, unless otherwise noted.) 

**==> picture [485 x 499] intentionally omitted <==**

**----- Start of picture text -----**<br>
MAXM17903 SHUTDOWN THROUGH VIN MAXM17901 STARTUP THROUGH VIN MAXM17903 SHUTDOWN THROUGH VIN<br>VIN = 12V, ADJUSTABLE VOUT = 3.3V, VIN = 12V, FIXED VOUT = 3.3V, VIN = 12V, ADJUSTABLE VOUT = 3.3V,<br>FULL LOAD, PWM MODE toc46 FULL LOAD, PWM MODE toc47 FULL LOAD, PWM MODE toc48<br>10V/div<br>VIN 10V/div VIN VIN 10V/div<br>LX 10V/div LX 10V/div LX 10V/div<br>2V/div<br>2V/div<br>VCC 2V/div VCC VCC 2V/div<br>VOUT 2V/div VOUT VOUT 2V/div<br>=.=<br>1ms/div 1ms/div 1ms/div<br>MAXM17903 OUTPUT SHORT IN STEADY STATE MAXM17903 OUTPUT SHORT DURING STARTUP<br>VIN = 12V, ADJUSTABLE VOUT = 3.3V, VIN=12V, ADJUSTABLE VOUT=3.3V,<br>FULL LOAD, PWM MODE toc49 FULL LOAD, PWM MODE toc50<br>10V/div<br>5V/div<br>SHORT VIN<br>VOUT 2V/div VOUT 2V/div<br>LX 20V/div<br>LX 10V/div<br>IOUT 200mA/div IOUT 200mA/div<br>FE<br>20ms/div 20ms/div<br>MAXM17901 OUTPUT SHORT IN STEADY STATE MAXM17901 OUTPUT SHORT DURING STARTUP<br>VIN = 12V, FIXED VOUT = 3.3V, FULL LOAD, PWM MODE toc51 VIN = 12V, FIXED VOUT = 3.3V, FULL LOAD, PWM MODE toc52<br>10V/div<br>5V/div<br>SHORT VIN<br>VOUT 2V/div VOUT 2V/div<br>LX LX<br>10V/div 10V/div<br>IOUT 500mA/div IOUT ae 200mA/div<br>20ms/div 20ms/div<br>**----- End of picture text -----**<br>


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## MAXM17901/MAXM17903 

## 4.5V to 24V, 300mA Himalaya uSLIC Step-Down Power Module 

## **Typical Operating Characteristics (continued)** 

## 

(VIN = VEN/UVLO = 12V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1, unless otherwise noted.) 

**==> picture [494 x 509] intentionally omitted <==**

**----- Start of picture text -----**<br>
MAXM17903 BODE PLOT MAXM17903 BODE PLOT MAXM17901 BODE PLOT<br>VIN = 12V, ADJUSTABLE VOUT = 1.5V,  VIN = 12V, ADJUSTABLE VOUT = 3.3V, VIN = 12V, FIXED VOUT = 3.3V,<br>80 FULL LOAD, PWM MODE toc53 90 80 FULL LOAD, PWM MODE toc54 90 80 FULL LOAD, PWM MODE toc55 90<br>60 pool ILI | 60 60 | ll 60 60 | el 60<br>wal a PN TT al Mot TL “|<br>40 40 40<br>a S PHASE 30 LPI PHASE IAPR 30 Hl PHASE Ie Pi 30<br>20 20 20<br>Pe TTT PS | LTT PE Th<br>0 l e lll 0 0 ATE: ALT 0 0 Pe ATT 0<br>GAIN GAIN GAIN<br>-20 -20 -20<br>-30 -30 -30<br>-40 a -40 e e -40<br>-60 S CROSSOVER FREQUENCY = 51.42kHzPHASE MARGIN = 53.85 ee ° [et] =a -60 -60 CROSSOVER FREQUENCY = 46.25 kHzPHASE MARGIN = 56.7° OT -60 -60 CROSSOVER FREQUENCY = 47.132 kHzPHASE MARGIN = 61.4° mt -60<br>-80 -90 -80 -90 -80 -90<br>1k 10k 100k 1k 10k 100k 1k 10k 100k<br>FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz)<br>MAXM17903  MAXM17901<br>OUTPUT CURRENT vs. AMBIENT TEMPERATURE OUTPUT CURRENT vs. AMBIENT TEMPERATURE<br>toc56 toc57<br>350 350<br>300 300<br>250 250<br>200 200<br>150 150 FIXED VOUT = 3.3V<br>ADJUSTABLE<br>100 VOUT = 2.5V 100<br>50 50<br>0 0<br>50 70 90 110 130 50 70 90 110 130<br>AMBIENT TEMPERATURE (°C) AMBIENT TEMPERATURE (°C)<br>CONDUCTED EMISSION PLOT<br>(WITH FILTER C = 0.1µF + 0.47µF, L = 82µH, C = 1µF) RADIATED EMISSION PLOT<br>70 toc58 70 toc59<br>CISPR-22 CLASS B QP LIMIT<br>60 60<br>CISPR-22 CLASS B AVG LIMIT 50<br>50<br>40 CISPR-22 CLASS B QP LIMIT<br>40<br>30<br>30 EMISSIONPEAK  20 VERTICAL SCAN<br>20<br>10<br>10<br>0 HORIZONTAL<br>AVERAGE  SCAN<br>EMISSION -10<br>150k 1M 10M 30M 100M 1G<br>FREQUENCY(Hz)<br>FREQUENCY(Hz) CONDITIONS: VIN = 12V, VOUT = 3.3V, IOUT = 0.3A<br>CONDITIONS: VIN = 12V, VOUT = 3.3V, IOUT = 0.3A<br>˚) ˚)<br>GAIN (dB) GAIN (dB) GAIN (dB)<br>PHASE MARGIN (°) PHASE MARGIN ( PHASE MARGIN (<br>OUTOPUT CURRENT (mA) OUTOPUT CURRENT (mA)<br>MAGNITUDE (dBµV/m)<br>MAGNITUDE (dBµV)<br>**----- End of picture text -----**<br>


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## MAXM17901/MAXM17903 

## 4.5V to 24V, 300mA Himalaya uSLIC Step-Down Power Module 

## **Pin Configuration** 

**==> picture [505 x 206] intentionally omitted <==**

**----- Start of picture text -----**<br>
TOP VIEW<br>+<br>LX 1 10 VIN<br>GND 2 MAXM17901 9 VIN<br>MAXM17903<br>RESET 3 8 EN/UVLO<br>MODE 4 7 VCC<br>OUT 5 6 FB<br>‘+’ INDICATES PIN 1 OF THE MODULE<br>**----- End of picture text -----**<br>


## **Pin Description** 

|**PIN**|**NAME**|**FUNCTION**|
|---|---|---|
|1|LX|Switching Node of the Inductor. No external connection to this pin.|
|2|GND|Ground Pin. Connect GND to the ground plane. See the_PCB Layout Guidelines_ section for more details.<br>Refer to the MAXM17903 EV kit for a sample layout.|
|3|RESET|Open-Drain Power-Good Output. Pull upRESETto an external power supply with an external resistor.<br>RESETgoes low if FB drops below 92% of its set value.RESETgoes high impedance 2ms after FB<br>rises above 95.5% of its set value. See the_Electrical Characteristics_ table for threshold values.|
|4|MODE|PFM/PWM Mode-Selection Input. Connect MODE to GND to enable fxed-frequency PWM operation<br>at all loads. Leave MODE unconnected for PFM operation at light load.|
|5|OUT|Module Output Pin. Connect a capacitor from OUT to GND.<br>See the_PCB Layout Guidelines_ section for more details.|
|6|FB|Output Feedback Connection. Connect FB to a resistor-divider between OUT and GND to set the output<br>voltage for MAXM17903. Connect to output voltage node (VOUT) for MAXM17901.<br>See_Output-Voltage Setting_ section for more details.|
|7|VCC|Internal LDO Power Output. Bypass VCCto GND with a minimum 1µF ceramic capacitor.|
|8|EN/UVLO|Active-High, Enable/Undervoltage-Detection Input. Pull EN/UVLO to GND to disable the module output.<br>Connect EN/UVLO to VINfor always-on operation. Connect a resistor-divider between VIN, EN/UVLO,<br>and GND to program the input voltage at which the module turns on.|
|9–10|VIN|Power-Supply Input. Connect the VINpins together. Decouple to GND with a capacitor; place the<br>capacitor close to the VINand GND pins. See Table 1for more details.|



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## MAXM17901/MAXM17903 

## 4.5V to 24V, 300mA Himalaya uSLIC Step-Down Power Module 

## **Functional Diagrams** 

## **Internal Diagram** 

**==> picture [506 x 439] intentionally omitted <==**

**----- Start of picture text -----**<br>
MAXM17901/MAXM17903<br>VCC VIN<br>LDO<br>HIGH-SIDE<br>DRIVER<br>EN/UVLO<br>1.215V LX<br>33µH<br>LOW-SIDE  OUT<br>PEAK DRIVER<br>OSCILLATOR CURRENT-MODE<br>CONTROLLER<br>SOFT-START GND<br>MODE<br>SLOPE<br>MODE SELECTION<br>COMPENSATION<br>LOGIC<br>*S1<br>*S2 R3 RESET RESET<br>FB<br>LOGIC<br>R4<br>* IMPLIES REFER TO TABLE A<br>**----- End of picture text -----**<br>


## **Table A** 

|**MODULE PART NUMBER**|**S1**|**S2**|**R3 (KΩ)**|**R4 (KΩ)**|
|---|---|---|---|---|
|MAXM17903|CLOSE|OPEN|OPEN|OPEN|
|MAXM17901|OPEN|CLOSE|205.33|77|



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## MAXM17901/MAXM17903 

## **Detailed Description** 

The MAXM17901/MAXM17903 are a family of highefficiency, synchronous step-down DC-DC modules with integrated controller, MOSFETs, compensation components, and inductor that operate over a wide input-voltage range. The modules deliver an output current up to 300mA. The MAXM17901 is a fixed 3.3V output modules. The MAXM17903 is an adjustable output (0.9V to 5V) module. When EN/UVLO and VCC UVLO are ascertained, an internal power-up sequence ramps up the error-amplifier reference, resulting in an output-voltage soft-start. 

The FB pin monitors the output voltage through a resistordivider. The RESET pin transitions to a high-impedance state 2ms after the output voltage reaches 95.5% of regulation. The devices select either PFM or forcedPWM mode depending on the state of the MODE pin at power-up. By pulling the EN/UVLO pin to low, the devices enter shutdown mode and consumes only 2.2μA (typ) of standby current. 

The modules use an internally compensated, fixedfre quency, current-mode control scheme. On the rising edge of an internal clock, the high-side pMOSFET turns on. An internal error amplifier compares the feedback voltage to a fixed internal refer ence voltage and generates an error voltage. The error voltage is compared to a sum of the current-sense voltage and a slope-compensation voltage by a PWM comparator to set the on-time. During the on-time of the pMOSFET, the inductor current ramps up. For the remainder of the switching period (off-time), the pMOSFET is kept off and the low-side nMOSFET turns on. During the off-time, the inductor releases the stored energy as the inductor current ramps down, providing current to the output. Under over load conditions, the cycle-by-cycle current-limit feature limits the inductor peak current by turning off the high-side pMOSFET and turning on the low-side nMOSFET. 

## **Mode Selection (MODE)** 

The logic state of the MODE pin is latched after VCC and EN/UVLO voltages exceed respective UVLO rising thresholds and all internal voltages are ready to allow LX switching. If the MODE pin is unconnected at power-up, the part operates in PFM mode at light loads. If the MODE pin is grounded at power-up, the part operates in constant-frequency PWM mode at all loads. State changes on the MODE pin are ignored during normal operation. 

## **PWM Operation** 

In PWM mode, the module output current is allowed to go negative. PWM operation is useful in frequency sensitive applications and provides fixed switching frequency 

## 4.5V to 24V, 300mA Himalaya uSLIC Step-Down Power Module 

operation at all loads. However, PWM-mode of operation gives lower efficiency at light loads compared to PFMmode of operation. 

## **PFM Operation** 

PFM mode operation disables negative output current from the module, and skips pulses at light loads for better efficiency. In PFM mode, the module output current is forced to a fixed peak of 130mA in every clock cycle until the output voltage rises to 102.3% of the nominal value. Once the output voltage reaches 102.3% of the nominal value, the high-side switch is turned off and the low-side switch is turned on. Once the module output current hits zero cross, LX goes to a high-impedance state and the module enters hibernate operation until the load current discharges the output voltage to 101.1% of the nominal value. Most of the internal blocks are turned off in hibernate operation to save quiescent current. When the output voltage falls below 101.1% of the nominal value, the module comes out of hibernate operation, turns on all internal blocks, and commences the process of delivering pulses of energy until the output voltage reaches 102.3% of the nominal value. The module naturally comes out of PFM mode and serves load requirements when the module output demands more than 130mA peak. The advantage of PFM mode is higher efficiency at light loads because of lower quiescent current drawn from supply. 

## **Internal 5V Regulator** 

An internal regulator provides a 5V nominal supply to power the internal functions and to drive the power MOSFETs. The output of the linear regulator (VCC) should be bypassed with a 1μF ceramic capacitor to GND. The VCC regulator dropout voltage is typically 150mV. An undervoltage lockout circuit that disables the buck converter when VCC falls below 3.8V (typ). The 400mV, VCC-UVLO hysteresis prevents chattering on power-up and power-down. 

## **Enable/Undervoltage Lockout (EN/UVLO), Soft-Start** 

When EN/UVLO voltage is above 1.215V (typ), the device’s internal error-amplifier reference voltage starts to ramp up. The duration of the soft-start ramp is 4.1ms (typ), allowing a smooth increase of the output voltage. Driving EN/UVLO low disables both power MOSFETs, as well as other internal circuitry, and reduces VIN quiescent current to below 2.2μA. EN/UVLO can be used as an input-voltage UVLO adjustment input. An external voltage-divider between VIN and EN/UVLO to GND adjusts the input voltage at which the device turns on or turns off. If input UVLO programming is not desired, connect EN/ UVLO to VIN (see the _Electrical Characteristics_ table for EN/UVLO rising and falling threshold voltages). 

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## MAXM17901/MAXM17903 

## **RESET Output ( RESET )** 

The devices include an open-drain RESET output to monitor the output voltage. RESET goes high impedance 2ms after the output rises above 95.5% of its nominal set value and pulls low when the output voltage falls below 92% of the set nominal regulated voltage. RESET asserts low during the hiccup timeout period. 

## **Startup into a Prebiased Output** 

The devices are capable of soft-start into a prebiased output, without discharging the output capacitor in both the PFM and forced-PWM modes. Such a feature is useful in applications where digital integrated circuits with multiple rails are powered. 

## **Overcurrent Protection (OCP)/Hiccup Mode** 

The MAXM17901/MAXM17903 are provided with a robust overcurrent protection (OCP) scheme that protects the modules under overload and output short-circuit conditions. The power module measures and limits peak inductor current. When overcurrent is detected in the inductor, or if the FB node goes below 64.5% of its nominal regulation threshold, the module enters hiccup mode of operation. In hiccup mode, the module is protected by suspending switching for a hiccup timeout period of 131ms (typ). Once the hiccup timeout period expires, soft-start is attempted again. Hiccup mode of operation ensures low power dissipation under output overload or short-circuit conditions. Once the hiccup timeout period expires, soft-start is attempted again. 

The MAXM17901/03 are designed to support a maximum load current of 300mA. The inductor ripple current is calculated as follows: 

**==> picture [236 x 28] intentionally omitted <==**

## Where: 

VOUT = Steady-state output voltage 

VIN = Operating input voltage for given VOUT 

fSW = Switching Frequency 

L = Power module output inductance (33µH ±30%) 

IOUT = Required output (load) current 

The following condition should be satisfied at the desired load current, IOUT. 

**==> picture [70 x 22] intentionally omitted <==**

## 4.5V to 24V, 300mA Himalaya uSLIC Step-Down Power Module 

## **Thermal Overload Protection** 

Thermal overload protection limits the total power dissipation in the device. When the junction temperature exceeds +166°C, an on-chip thermal sensor shuts down the device, turns off the internal power MOSFETs, allowing the device to cool down. The thermal sensor turns the device on after the junction temperature cools by 10°C. 

## **Applications Information** 

## **Input-Voltage Range** 

The minimum and maximum operating input voltages for a given output voltage should be calculated as follows: 

**==> picture [195 x 26] intentionally omitted <==**

**==> picture [117 x 26] intentionally omitted <==**

where: 

VOUT = Steady-state output voltage, 

IOUT  = Maximum load current, 

fSW = Worst-case switching frequency(535000 Hz), 

DMAX  = Maximum duty cycle (0.89), 

tON(MIN) = Worst-case minimum controllable switch ontime (130ns). 

Also, for duty cycle > 0.5; 

VIN(MIN) > ((4.27 × VOUT) − 9.76) 

For MAXM17901, VIN(MIN) = 5.5V, VIN(MAX) = 24V 

## **Selection of Input Capacitor** 

The input filter capacitor reduces peak currents drawn from the power source and reduces noise and voltage ripple on the input caused by the converter’s switching. 

The input capacitor RMS current requirement (IRMS) is defined by the following equation: 

**==> picture [186 x 30] intentionally omitted <==**

where, IOUT(MAX) is the maximum load current. IRMS has a maximum value when the input voltage equals twice the output voltage (VIN = 2 x VOUT). So, 

**==> picture [104 x 23] intentionally omitted <==**

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## MAXM17901/MAXM17903 

## 4.5V to 24V, 300mA Himalaya uSLIC Step-Down Power Module 

Choose an input capacitor that exhibits less than a +10°C temperature rise at the RMS input current for optimal long-term reliability. Use low-ESR ceramic capacitors with high-ripple-current capability at the input. X7R capacitors are recommended in industrial applications for their temperature stability. Calculate the input capacitance using the following equation: 

**==> picture [161 x 27] intentionally omitted <==**

where: 

DMAX = Maximum duty cycle(0.89), 

fSW = Switching frequency, 

∆VIN = Allowable input-voltage ripple. 

## **Selection of Output Capacitor** 

Small ceramic X7R-grade capacitors are sufficient and recommended for output-voltage generation. The output capacitor has two functions. It provides smooth voltage and, stores sufficient energy to support the output voltage under load transient conditions and stabilizes the device’s internal control loop. Usually the output capacitor is sized to support a step load of 50% of the maximum output current in the application, such that the output-voltage deviation is less than 3%. Required output capacitance can be calculated from the following equation: 

**==> picture [65 x 24] intentionally omitted <==**

where COUT is the output capacitance in μF and VOUT is the output voltage. Derating of ceramic capacitors with DC-voltage must be considered while selecting the output capacitor. 

## **Setting the Input Undervoltage-Lockout Level** 

The devices offer an adjustable input undervoltage lockout level. Set the voltage at which the device turns on with a resistive voltage-divider connected from VIN to GND (see Figure 1). Connect the center node of the divider to EN/UVLO. 

Choose R1 to be 3.3MΩ (max), and then calculate R2 as follows: 

**==> picture [78 x 24] intentionally omitted <==**

where VINU is the voltage at which the device is required to turn on. 

If the EN/UVLO pin is driven from an external signal source, a series resistance of minimum 1kΩ is recommended to be placed between the signal source output and and the EN/UVLO pin, to reduce voltage ringing on the line. 

## **Output-Voltage Setting** 

The MAXM17903 output voltage can be programmed from 0.9V to 5V. Set the output voltage by connecting a resistor-divider from output to FB to GND (see Figure 2). 

Choose R4 less than or equal to 75kΩ and calculate R3 with the following equation: 

**==> picture [91 x 25] intentionally omitted <==**

Connect FB of MAXM17901 directly to VOUT for feedback control. 

**==> picture [504 x 130] intentionally omitted <==**

**----- Start of picture text -----**<br>
VIN OUT<br>MAXM17901<br>R1 MAXM17903 MAXM17903 R3<br>EN/UVLO FB<br>R2 R4<br>**----- End of picture text -----**<br>


_Figure 1. Adjustable EN/UVLO Network_ 

_Figure 2. Setting the Output Voltage_ 

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## MAXM17901/MAXM17903 

## 4.5V to 24V, 300mA Himalaya uSLIC Step-Down Power Module 

## **Table 1. Selection of Components** 

|**PART**<br>**NUMBER**|**VIN(MIN)**<br>**(V)**|**VIN(MAX)**<br>**(V)**|**VOUT* **<br>**(V)**|**CIN**|**COUT**|**R3**<br>**(kΩ)**|**R4**<br>**(kΩ)**|
|---|---|---|---|---|---|---|---|
|MAXM17903|4.5|12.5|0.9|1 x 1µF 0805 25V<br>(Murata GR219R71E105KA88D)|1 x 47µF 1210 6.3V<br>(Murata GRM32ER70J476KE20L)|SHORT|OPEN|
||4.5|14|1|1 x 1µF 0805 25V<br>(Murata GR219R71E105KA88D)|1 x 47µF 1210 6.3V<br>(Murata GRM32ER70J476KE20L)|8.33|75|
||4.5|17|1.2|1 x 1µF 0805 25V<br>(Murata GR219R71E105KA88D)|1 x 47µF 1210 6.3V<br>(Murata GRM32ER70J476KE20L)|25|75|
||4.5|21.5|1.5|1 x 1µF 0805 25V<br>(Murata GR219R71E105KA88D)|1 x 22µF 1206 6.3V<br>(Murata GRM31CR70J226KE19L)|50|75|
||4.5|24|1.8|1 x 1µF 0805 50V<br>(Murata GRM21BR71105KA12L)|1 x 22µF 1206 6.3V<br>(Murata GRM31CR70J226KE19L)|75|75|
||4.5|24|2.5|1 x 1µF 0805 50V<br>(Murata GRM21BR71105KA12L)|1 x 22µF 1206 6.3V<br>(Murata GRM31CR70J226KE19L)|133|75|
||5.5|24|3.3|1 x 1µF 0805 50V<br>(Murata GRM21BR71105KA12L)|1 x 10µF 1206 6.3V<br>(Murata GRM31CR70J106KA01L)|200|75|
||12|24|5|1 x 1µF 0805 50V<br>(Murata GRM21BR71105KA12L)|1 x 10µF 1206 6.3V<br>(Murata GRM31CR70J106KA01L)|348|75|
|MAXM17901|5.5|24|3.3|1 x 1μF 0805 50V<br>(Murata GRM21BR71105KA12L)|1 x 10μF 1206 6.3V<br>(Murata GRM31CR70J106KA01L)|N/A|N/A|



***** _The modules have a pulse skip algorithm that allows VOUT to be regulated beyond the VIN(MAX) specified in the above table, up to 24V._ 

## **Power Dissipation** 

The power dissipation inside the module leads to increase in the junction temperature of the MAXM17901/ MAXM17903. The power loss inside the module at full load can be estimated as follows: 

**==> picture [100 x 27] intentionally omitted <==**

Where η is the efficiency of the power module at the desired operating conditions. The junction temperature (TJ) of the module can be estimated at any given maximum ambient temperature (TA) from the following equation: 

**==> picture [104 x 13] intentionally omitted <==**

For the MAXM17901/MAXM17903 evaluation board, the thermal resistance from junction-to-ambient (θJA) is 41.56°C/W. Operating the module at junction temperatures greater than +125°C degrades operating lifetimes. An EESIM model is available for the MAXM17901/ MAXM17903 to simulate efficiency and power loss for the desired operating conditions. 

## **PCB Layout Guidelines** 

Use the following guidelines for good PCB layout: 

- Keep the input capacitors as close as possible to the IN and GND pins. 

- Keep the output capacitors as close as possible to the OUT and GND pins. 

- Keep the resistive feedback dividers as close as possible to the FB pin. 

- Keep the power traces and load connections short. Refer to the EV kit layout for first-pass success. 

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## MAXM17901/MAXM17903 

## 4.5V to 24V, 300mA Himalaya uSLIC Step-Down Power Module 

**==> picture [504 x 490] intentionally omitted <==**

**----- Start of picture text -----**<br>
VIN VOUT<br>VIN OUT<br>CIN R1 RESET R3 COUT<br>MAXM17903<br>EN/UVLO FB<br>VCC LX R4<br>R2<br>CVCC<br>MODE<br>GND<br>CIN<br>GND PLANE VIN PLANE<br>+<br>1 LX 10 VIN<br>GND 2 MAXM17903 9 VIN<br>R1<br>RESET 3 8 EN/UVLO<br>MODE 4 7 VCC R2<br>OUT 5 6<br>CVCC<br>FB<br>COUT<br>VOUT PLANE GND PLANE<br>R3 R4<br>VIA TO INNER LAYER FOR ROUTING FB<br>**----- End of picture text -----**<br>


_Figure 3. Adjustable Output Layout Guidelines_ 

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## MAXM17901/MAXM17903 

## 4.5V to 24V, 300mA Himalaya uSLIC Step-Down Power Module 

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VIN VOUT<br>VIN OUT<br>CIN R1 RESET COUT<br>MAXM17901<br>EN/UVLO FB<br>VCC LX<br>R2<br>CVCC<br>MODE<br>GND<br>CIN<br>GND PLANE VIN PLANE<br>+<br>1 LX 10 VIN<br>GND 2 MAXM17901 9 VIN<br>R1<br>RESET 3 8 EN/UVLO<br>MODE 4 7 VCC R2<br>OUT 5 6<br>CVCC<br>FB<br>COUT<br>VOUT PLANE GND PLANE<br>VIA TO INNER LAYER FOR ROUTING FB<br>**----- End of picture text -----**<br>


_Figure 4. Fixed Output Layout Guidelines_ 

Maxim Integrated │ 18 

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## MAXM17901/MAXM17903 

## 4.5V to 24V, 300mA Himalaya uSLIC Step-Down Power Module 

## **Typical Application Circuits** 

## **Typical Application Circuit for Adjustable 2.5V output** 

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VIN VOUT<br>4.5V TO 24V 2.5V, 300mA<br>VIN OUT<br>C2<br>C1 22µF R1<br>1µF EN/UVLO GND 133kΩ<br>MAXM17903<br>RESET FB<br>VCC LX R2<br>C3 75kΩ<br>1µF MODE<br>MODE = GND FOR PWM<br>MODE = OPEN FOR PFM<br>C1 = MURATA 1μF/X7R/50V/0805 (GRM21BR71H105KA12L)<br>C2 = MURATA 22μF/X7R/6.3V/1206 (GRM31CR70J226KE19L)<br>C3 = MURATA 1μF/X7R/6.3V/0603 (GRM188R70J105K)<br>**----- End of picture text -----**<br>


## **Typical Application Circuit for Adjustable 1.5V output** 

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**----- Start of picture text -----**<br>
VIN VOUT<br>4.5V TO 21.5V 1.5V, 300mA<br>VIN OUT<br>C2<br>C1 22µF R1<br>1µF EN/UVLO GND 50kΩ<br>MAXM17903<br>RESET FB<br>VCC LX R2<br>C3 75kΩ<br>1µF MODE<br>MODE = GND FOR PWM<br>MODE = OPEN FOR PFM<br>C1 = MURATA 1μF/X7R/25V/0805 (GRM219R71E105KA88D)<br>C2 = MURATA 22μF/X7R/6.3V/1206 (GRM31CR70J226KE19L)<br>C3 = MURATA 1μF/X7R/6.3V/0603 (GRM188R70J105K)<br>**----- End of picture text -----**<br>


Maxim Integrated │ 19 

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## MAXM17901/MAXM17903 

## 4.5V to 24V, 300mA Himalaya uSLIC Step-Down Power Module 

## **Typical Application Circuits (continued)** 

## **Typical Application Circuit for Fixed 3.3V output** 

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VIN VOUT<br>5.5V TO 24V 3.3V, 300mA<br>VIN OUT<br>C2<br>C1 10µF<br>1µF EN/UVLO GND<br>MAXM17901<br>RESET FB<br>VCC LX<br>C3<br>1µF MODE<br>**----- End of picture text -----**<br>


MODE = GND FOR PWM MODE = OPEN FOR PFM C1 = MURATA 1μF/X7R/50V/0805 (GRM21BR71H105KA12L) C2 = MURATA 10μF/X7R/6.3V/1206 (GRM31CR70J106KA01L) C3 = MURATA 1μF/X7R/6.3V/0603 (GRM188R70J105K) 

## **Ordering Information** 

|**PART**<br>**NUMBER**|**TEMP**<br>**RANGE**|**PIN-PACKAGE**|
|---|---|---|
|**MAXM17901**AMB+|-40°C to +125°C|10-pin uSLIC|
|MAXM17901AMB+T|-40°C to +125°C|10-pin uSLIC|
|**MAXM17903**AMB+|-40°C to +125°C|10-pin uSLIC|
|MAXM17903AMB+T|-40°C to +125°C|10-pin uSLIC|



_+ Denotes a lead(Pb)-free/RoHS-compliant package._ 

_T Denotes tape-and-reel._ 

Maxim Integrated │ 20 

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## MAXM17901/MAXM17903 

## 4.5V to 24V, 300mA Himalaya uSLIC Step-Down Power Module 

## **Revision History** 

|**Revision**|**History**|||
|---|---|---|---|
|**REVISION**<br>**NUMBER**|**REVISION**<br>**DATE**|**DESCRIPTION**|**PAGES**<br>**CHANGED**|
|0|12/17|Initial release|—|
|1|11/18|Updated the Title,_General Description_,_Benefts and Features_,_Applications_,<br>_Absolute Maximum Ratings_,_Electrical Characteristics_,_Typical Operating_<br>_Characteristics_,_Pin Description_,_Detailed Description_,_Overcurrent Protection (OCP)/_<br>_Hiccup Mode_,_Input-Voltage Range_,_Output-Voltage Setting_,_Power Dissipation_<br>sections, Table A, Table 1, and the_Ordering Information_table; replaced all the_Typical_<br>_Application Circuits_,_Functional Diagram_,_Pin Confguration_, and Figures 1–4.|1–20|



For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html. 

_Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance._ 

© 2018 Maxim Integrated Products, Inc. │ 21 

Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. 



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- [Supplier page](https://es.farnell.com/analog-devices/maxm17901amb-t/dc-dc-converter-3-3-0-3a/dp/3582109)
---

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