MAXM15462 MAXIM | Alldatasheet

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Technical content

The Himalaya series of voltage regulator ICs and power modules enable cooler, smaller, and simpler power- supply solutions. The MAXM15462 is a high-efficiency, synchronous step-down DC-DC module with integrated controller, MOSFETs, compensation components, and inductor that operates over a wide input-voltage range. The module operates from 4.5V to 42V input and delivers up to 300mA output current over a programmable output voltage from 0.9V to 5V. The module significantly reduces design complexity, manufacturing risks, and offers a true plug and play power/supply solution, reducing time-to- market. The MAXM15462 employs peak-current-mode control architecture. To reduce input inrush current, the device offers a fixed 4.1ms soft-start time. The MAXM15462 module is available in a low profile, com- pact 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
  • Battery-Powered Equipment Ordering Information appears at end of data sheet. uSLIC is a trademark of Maxim Integrated Products, Inc. 19-100177; Rev 2; 3/18 Benefits and Features
  • Easy to Use
  • Wide 4.5V to 42V Input
  • Adjustable 0.9V to 5V Output
  • ±1.44% 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 Typical Application Circuit MAXM15462 VIN VCC LX GND MODE RESET OUT EN/UVLO FB 24V 5V,300mA CIN 1µF 1µF 348kΩ 75kΩ VIN VOUT COUT 10µF MAXM15462 4.5V to 42V, 300mA Himalaya uSLIC Step-Down Power Module EVALUATION KIT AVAILABLE

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 (VIN = VEN/UVLO = 24V, VGND = 0V, CVCC = 1μF, FB = 1V, 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 TYP MAX UNITS INPUT SUPPLY (VIN) Input-Voltage Range VIN 4.5 42 V Input-Shutdown Current IIN-SH VEN/UVLO = 0V, shutdown mode 2.2 4 μA Input-Supply Current IQ-PFM MODE = unconnected, FB = 1.03 × VFB-REG 95 160 μA IQ-PWM Normal switching mode, VIN = 24V , MODE=0 3.2 mA ENABLE/UVLO (EN/UVLO) EN/UVLO Threshold VENR VEN/UVLO rising 1.19 1.215 1.28 VVENF VEN/UVLO falling 1.06 1.09 1.16 VEN-TRUESD VEN/UVLO falling, true shutdown 0.75 EN/UVLO Input-Leakage Current IEN/UVLO TA = +25°C -100 +100 nA Absolute Maximum Ratings 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. 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. 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.

Package Information

Electrical Characteristics

www.maximintegrated.com Maxim Integrated │ 2 MAXM15462 4.5V to 42V, 300mA Himalaya uSLIC Step-Down Power Module

(VIN = VEN/UVLO = 24V, VGND = 0V, CVCC = 1μF, FB = 1V, 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) Note 3: Electrical specifications are production tested at T A = +25°C. Specifications over the entire operating temperature range are guaranteed by design and characterization. PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS LDO (VCC) VCC Output-Voltage Range VCC 6V < VIN < 42V, 0mA < IVCC < 10mA 4.75 5 5.25 V VCC Current Limit IVCC-MAX VCC = 4.3V 13 30 50 mA VCC Dropout VCC-DO VIN = 4.5V, IVCC = 5mA 0.15 0.3 V VCC UVLO VCC-UVR VCC rising 4.05 4.18 4.3 V VCC-UVF VCC falling 3.7 3.8 3.95 SOFT-START (SS) Soft-Start Time tSS 3.8 4.1 4.4 ms FEEDBACK (FB) FB-Regulation Voltage VFB-REG MODE = GND 0.887 0.9 0.913 V MODE = unconnected 0.887 0.915 0.936 FB-Leakage Current IFB -100 -25 nA TIMING Switching Frequency fSW 465 500 535 kHz FB Undervoltage Trip Level to Cause Hiccup 62.5 64.5 66.5 % Hiccup Timeout 131 ms Minimum On-Time tON-MIN 90 130 ns Maximum Duty Cycle DMAX FB = 0.98 × FBREG 89 91.4 94 % RESET FB Threshold for RESET Rising FB rising 93.5 95.5 97.5 % FB Threshold for RESET Falling FB falling 90 92 94 % RESET Delay After FB Reaches 95% Regulation 2 ms RESET Output-Level Low IRESET = 5mA 0.2 V RESET Output-Leakage Current VRESET = 5.5V, TA = +25°C 0.1 μA MODE MODE Internal Pullup Resistor 500 kΩ THERMAL SHUTDOWN Thermal-Shutdown Threshold Temperature rising 166 °C Thermal-Shutdown Hysteresis 10 °C Electrical Characteristics (continued) www.maximintegrated.com Maxim Integrated │ 3 MAXM15462 4.5V to 42V, 300mA Himalaya uSLIC Step-Down Power Module

(VIN = VEN/UVLO = 24V, 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 other- wise noted.) Typical Operating Characteristics 100 0 30 60 90 120 150 180 210 240 270 300 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT VOUT = 0.9V, PWM MODE toc01 VIN = 4.5V VIN = 12V 100 0 30 60 90 120 150 180 210 240 270 300 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT VOUT = 3.3V, PWM MODE toc04 VIN = 36V VIN = 5.5V VIN = 12V VIN = 24V VIN = 42V 100 1 10 100 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT VOUT = 1.5V, PFM MODE toc07 VIN = 4.5V VIN = 12V VIN = 21.5V 100 0 30 60 90 120 150 180 210 240 270 300 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT VOUT = 1.5V, PWM MODE toc02 VIN = 4.5V VIN = 12V VIN = 21.5V 100 0 30 60 90 120 150 180 210 240 270 300 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT VOUT = 5V, PWM MODE toc05 VIN = 24V VIN = 12V VIN = 36V VIN = 42V 100 1 10 100 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT VOUT = 2.5V, PFM MODE toc08 VIN = 24V VIN = 12V VIN = 36V VIN = 4.5V 100 0 30 60 90 120 150 180 210 240 270 300 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT VOUT = 2.5V, PWM MODE toc03 VIN = 4.5V VIN = 12V VIN = 24V VIN = 36V 100 1 10 100 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT VOUT = 0.9V , PFM MODE toc06 VIN = 4.5V VIN = 12V 100 1 10 100 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT VOUT = 3.3V, PFM MODE toc09 VIN = 24VVIN = 12V VIN = 36V VIN = 42V VIN = 5.5V Maxim Integrated │ 4 www.maximintegrated.com MAXM15462 4.5V to 42V, 300mA Himalaya uSLIC Step-Down Power Module

(VIN = VEN/UVLO = 24V, 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 other- wise noted.) Typical Operating Characteristics (continued) 100 1 10 100 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT VOUT = 5V, PFM MODE toc10 VIN = 24V VIN = 12V VIN = 36V VIN = 42V 2.470 2.476 2.482 2.488 2.494 2.500 2.506 2.512 2.518 2.524 0 30 60 90 120 150 180 210 240 270 300 OUTPUT VOLTAGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT VOUT = 2.5V, PWM MODE toc12 VIN = 4.5VVIN = 36V VIN = 12V VIN = 24V 0.880 0.889 0.898 0.907 0.916 0.925 0.934 0 30 60 90 120 150 180 210 240 270 300 OUTPUT VOLTAGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT VOUT = 0.9V, PFM MODE toc16 VIN = 4.5V VIN = 12V 0.896 0.897 0.898 0.899 0.900 0.901 0.902 0.903 0.904 0 30 60 90 120 150 180 210 240 270 300 OUTPUT VOLTAGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT VOUT = 0.9V, PWM MODE toc11 VIN = 4.5V VIN = 12V 3.280 3.284 3.288 3.292 3.296 3.300 3.304 3.308 0 30 60 90 120 150 180 210 240 270 300 OUTPUT VOLTAGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT VOUT = 3.3V, PWM MODE toc14 VIN = 36V VIN = 5.5V VIN = 42V VIN = 24VVIN = 12V 1.48 1.49 1.50 1.51 1.52 1.53 1.54 1.55 0 30 60 90 120 150 180 210 240 270 300 OUTPUT VOLTAGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT VOUT = 1.5V, PFM MODE toc17 VIN = 4.5V VIN = 21.5V VIN = 12V 1.484 1.488 1.492 1.496 1.500 1.504 1.508 0 30 60 90 120 150 180 210 240 270 300 OUTPUT VOLTAGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT VOUT = 1.5V, PWM MODE toc12 VIN = 4.5V VIN = 12V VIN = 21.5V 5.040 5.046 5.052 5.058 5.064 5.070 5.076 0 30 60 90 120 150 180 210 240 270 300 OUTPUT VOLTAGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT VOUT = 5V, PWM MODE toc15 VIN = 42V VIN = 24VVIN = 12V VIN = 36V 2.44 2.46 2.48 2.50 2.52 2.54 2.56 2.58 0 30 60 90 120 150 180 210 240 270 300 OUTPUT VOLTAGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT VOUT = 2.5V, PFM MODE toc18 VIN = 36V VIN = 4.5V VIN = 24V VIN = 12V Maxim Integrated │ 5 www.maximintegrated.com MAXM15462 4.5V to 42V, 300mA Himalaya uSLIC Step-Down Power Module

(VIN = VEN/UVLO = 24V, 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 other- wise noted.) Typical Operating Characteristics (continued) 3.250 3.270 3.290 3.310 3.330 3.350 3.370 3.390 0 30 60 90 120 150 180 210 240 270 300 OUTPUT VOLTAGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT VOUT = 3.3V, PFM MODE toc19 VIN = 36V VIN = 4.5V VIN = 42V VIN = 24V VIN = 12V toc22 2µs/div VOUT (AC) 10mV/div OUTPUT-VOLTAGE RIPPLE VIN = 24V, VOUT = 3.3V, FULL LOAD, PWM MODE toc25 2µs/div VIN (AC) 100mV/div INPUT-VOLTAGE RIPPLE VIN = 24V, VOUT = 3.3V, FULL LOAD, PWM MODE 5.00 5.02 5.04 5.06 5.08 5.10 5.12 5.14 5.16 5.18 5.20 0 30 60 90 120 150 180 210 240 270 300 OUTPUT VOLTAGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT VOUT = 5V, PFM MODE toc20 VIN = 36V VIN = 42V VIN = 24V VIN = 12V toc23 2µs/div VOUT (AC) 10mV/div OUTPUT-VOLTAGE RIPPLE VIN = 24V, VOUT = 5V, FULL LOAD, PWM MODE toc26 2µs/div VIN (AC) 100mV/div INPUT-VOLTAGE RIPPLE VIN = 24V, VOUT = 5V, FULL LOAD, PWM MODE toc21 2µs/div VOUT (AC) 10mV/div OUTPUT-VOLTAGE RIPPLE VIN = 12V, VOUT = 1.5V, FULL LOAD, PWM MODE toc24 2µs/div VIN (AC) 100mV/div INPUT-VOLTAGE RIPPLE, VIN = 12V, VOUT = 1.5V, FULL LOAD, PWM MODE 20mV/div 100mA/div toc27 100µs/div VOUT (AC) IOUT LOAD TRANSIENT RESPONSE VIN = 12V, VOUT = 1.5V, PFM MODE (LOAD CURRENT STEPPED FROM 5mA to 150mA) Maxim Integrated │ 6 www.maximintegrated.com MAXM15462 4.5V to 42V, 300mA Himalaya uSLIC Step-Down Power Module

(VIN = VEN/UVLO = 24V, 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 other- wise noted.) Typical Operating Characteristics (continued) 20mV/div 100mA/div toc28 100µs/div VOUT (AC) IOUT LOAD TRANSIENT RESPONSE VIN = 12V, VOUT = 1.5V, PWM MODE (LOAD CURRENT STEPPED FROM 150mA TO 300mA) 100mV/div 100mA/div toc31 100µs/div VOUT (AC) IOUT LOAD TRANSIENT RESPONSE VIN = 24V, VOUT = 5V, PFM MODE (LOAD CURRENT STEPPED FROM 5mA TO 150mA) 1V/div toc34 100µs/div EN/UVLO VOUT 5V/div SHUTDOWN THROUGH ENABLE VIN = 12V, VOUT = 1.5V, FULL LOAD, PWM MODE 10V/div RESET 5V/div LX 100mV/div 100mA/div toc29 100µs/div VOUT (AC) IOUT LOAD TRANSIENT RESPONSE VIN = 24V, VOUT = 3.3V, PFM MODE (LOAD CURRENT STEPPED FROM 5mA TO 150mA) 50mV/div 100mA/div toc32 100µs/div VOUT (AC) IOUT LOAD TRANSIENT RESPONSE VIN = 24V, VOUT = 5V, PWM MODE (LOAD CURRENT STEPPED FROM 150mA TO 300mA) 5V/div toc35 1ms/div EN/UVLO VOUT 20V/div 5V/div STARTUP THROUGH ENABLE VIN = 24V, VOUT = 3.3V, FULL LOAD, PWM MODE LX 2V/div RESET 50mV/div 100mA/div toc30 100µs/div VOUT (AC) IOUT LOAD TRANSIENT RESPONSE VIN = 24V, VOUT = 3.3V, PWM MODE (LOAD CURRENT STEPPED FROM 150mA TO 300mA) 5V/div toc33 1ms/div EN/UVLO VOUT 10V/div 5V/div STARTUP THROUGH ENABLE VIN = 12V, VOUT = 1.5V, FULL LOAD, PWM MODE LX 1V/div RESET 2V/div toc36 100µs/div EN/UVLO VOUT 5V/div SHUTDOWN THROUGH ENABLE VIN = 24V, VOUT = 3.3V, FULL LOAD, PWM MODE 20V/div RESET 5V/div LX Maxim Integrated │ 7 www.maximintegrated.com MAXM15462 4.5V to 42V, 300mA Himalaya uSLIC Step-Down Power Module

(VIN = VEN/UVLO = 24V, 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 other- wise noted.) Typical Operating Characteristics (continued) 5V/div toc37 1ms/div EN/UVLO VOUT 20V/div 5V/div STARTUP THROUGH ENABLE (2V PREBIAS) VIN = 24V, VOUT = 3.3V, NO LOAD, PWM MODE LX 2V/div RESET 2V/div toc40 100µs/div EN/UVLO VOUT 5V/div SHUTDOWN THROUGH ENABLE (VIN = 24V, VOUT = 5V, FULL LOAD, PWM MODE) 20V/div RESET 5V/div LX 2V/div toc43 1ms/div VIN VCC 20V/div 20V/div STARTUP THROUGH VIN VIN = 24V, VOUT = 3.3V, FULL LOAD, PWM MODE LX 2V/div VOUT 5V/div toc38 1ms/div EN/UVLO VOUT 20V/div 5V/div STARTUP THROUGH ENABLE (2V PREBIAS) (VIN = 24V, VOUT = 3.3V, NO LOAD, PFM MODE) LX 2V/div RESET 500mV/div toc41 1ms/div VIN VCC 10V/div 10V/div STARTUP THROUGH VIN VIN = 12V, VOUT = 1.5V, FULL LOAD, PWM MODE LX 2V/div VOUT 2V/div toc44 1ms/div VIN VCC 20V/div 20V/div SHUTDOWN THROUGH VIN VIN = 24V, VOUT = 3.3V, FULL LOAD, PWM MODE LX 2V/div VOUT 5V/div toc39 1ms/div EN/UVLO VOUT 20V/div 5V/div STARTUP THROUGH ENABLE VIN = 24V, VOUT = 5V, FULL LOAD, PWM MODE LX 2V/div RESET 500mV/div toc42 1ms/div VIN VCC 10V/div 10V/div SHUTDOWN THROUGH VIN VIN = 12V, VOUT = 1.5V, FULL LOAD, PWM MODE LX 2V/div VOUT 2V/div toc45 1ms/div VIN VCC 20V/div 20V/div STARTUP THROUGH VIN VIN = 24V, VOUT = 5V, FULL LOAD, PWM MODE LX 2V/div VOUT Maxim Integrated │ 8 www.maximintegrated.com MAXM15462 4.5V to 42V, 300mA Himalaya uSLIC Step-Down Power Module

(VIN = VEN/UVLO = 24V, 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 other- wise noted.) Typical Operating Characteristics (continued) 2V/div toc46 1ms/div VIN VCC 20V/div 20V/div SHUTDOWN THROUGH VIN VIN = 24V, VOUT = 5V, FULL LOAD, PWM MODE LX 2V/div VOUT -90 -60 -30 1k 10k 100k -80 -60 -40 -20 PHASE MARGIN (°) GAIN (dB) FREQUENCY (Hz) GAIN toc49 PHASE CROSSOVER FREQUENCY = 51.42kHz PHASE MARGIN = 53.85◦ BODE PLOT (VIN = 12V, VOUT = 1.5V, FULL LOAD, MODE = PWM) 100 150 200 250 300 350 50 70 90 110 130 OUTOPUT CURRENT (mA) AMBIENT TEMPERATURE (°C) OUTPUT CURRENT vs. AMBIENT TEMPERATURE toc52 VOUT = 3.3V VOUT = 5V VOUT = 2.5V 20V/div toc47 20ms/div SHORT VOUT 2V/div OUTPUT SHORT IN STEADY STATE VIN = 24V, VOUT = 3.3V, FULL LOAD, PWM MODE 5V/div LX IOUT 200mA/div -90 -60 -30 1k 10k 100k -80 -60 -40 -20 PHASE MARGIN (°) GAIN (dB) FREQUENCY (Hz) GAIN toc50 PHASE CROSSOVER FREQUENCY = 45.732kHz PHASE MARGIN = 56.3° BODE PLOT (VIN = 24V, VOUT = 3.3V, FULL LOAD, MODE = PWM) 20V/div toc48 20ms/div VOUT 20mV/div OUTPUT SHORT DURING STARTUP VIN = 24V, VOUT = 3.3V, FULL LOAD, PWM MODE 20V/div LX VIN 10mA/divIOUT -90 -60 -30 1k 10k 100k -80 -60 -40 -20 PHASE MARGIN (°) GAIN (dB) FREQUENCY (Hz) GAIN toc51 PHASE CROSSOVER FREQUENCY = 43.26kHz PHASE MARGIN = 58.03° BODE PLOT VIN = 24V, VOUT = 5V, FULL LOAD, PWM MODE Maxim Integrated │ 9 www.maximintegrated.com MAXM15462 4.5V to 42V, 300mA Himalaya uSLIC Step-Down Power Module

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. Refer to the MAXM15462 EV kit for a sample layout.

3 RESET

Open-Drain Power-Good Output. Pull up RESET to an external power supply with an external resistor. RESET goes low if FB drops below 92% of its set value. RESET goes high impedance 2ms after FB 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 fixed-frequency PWM operation at all loads. Leave MODE unconnected for PFM operation at light load. 5 OUT Module Output Pin. Connect a capacitor from OUT to GND. 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 voltage. 7 VCC Internal LDO Power Output. Bypass VCC to 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. Connect EN/UVLO to VIN for always-on operation. Connect a resistor-divider between VIN, EN/UVLO, and GND to program the input voltage at which the module turns on. 9–10 VIN Power-Supply Input. Connect the VIN pins together. Decouple to GND with a capacitor; place the capacitor close to the VIN and GND pins. See Table 1 for more details. Pin Configuration MAXM15462 VIN VCC LX GND MODE RESET OUT EN/UVLO FB VIN 5 6 TOP VIEW ‘+’ INDICATES PIN 1 OF THE MODULE Pin Description www.maximintegrated.com Maxim Integrated │ 10 MAXM15462 4.5V to 42V, 300mA Himalaya uSLIC Step-Down Power Module

1.215V MAXM15462 33µH EN/UVLO VIN RESET GND LX OUT FB MODE MODE SELECTION LOGIC HIGH-SIDE DRIVER OSCILLATOR SOFT-START SLOPE COMPENSATION LOW-SIDE DRIVER www.maximintegrated.com Maxim Integrated │ 11 MAXM15462 4.5V to 42V, 300mA Himalaya uSLIC Step-Down Power Module

The MAXM15462 module is a high-voltage, syn chronous step-down DC-DC module with integrated MOSFETs and inductor, that operates over a wide 4.5V to 42V input- voltage range. The module delivers an output current up to 300mA over a programmable output-voltage range of 0.9V to 5V. When EN/UVLO and V CC UVLO are ascertained, an internal power-up sequence ramps up the error-ampli- fier reference, resulting in an output-voltage soft-start. The FB pin monitors the output voltage through a resistor- divider. 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 forced- PWM 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 module uses an internally compensated, fixed-fre- 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 volt - age 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, pro - viding 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 V CC 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 con - stant-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 sensi - tive applications and provides fixed switching frequency operation at all loads. However, PWM-mode of operation gives lower efficiency at light loads compared to PFM- mode of operation. PFM Operation PFM mode operation disables negative output current from the module, and skips pulses at light loads for bet - ter 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 cur- rent 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 (V CC) should be bypassed with a 1μF ceramic capacitor to GND. The V CC regula- tor dropout voltage is typically 150mV. An undervoltage lockout circuit that disables the buck converter when VCC falls below 3.8V (typ). The 400mV, V CC-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 volt - age-divider between V IN 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 V IN (see the Electrical Characteristics table for EN/UVLO rising and falling threshold voltages). www.maximintegrated.com Maxim Integrated │ 12 MAXM15462 4.5V to 42V, 300mA Himalaya uSLIC Step-Down Power Module

RESET Output (RESET) The device includes 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 device is capable of soft-start into a prebiased out - put, 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 device is provided with a robust overcurrent protec - tion (OCP) scheme that protects the device under over - load and output short-circuit conditions. When the device detects either overcurrent, 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 converter is protected by suspending switching for a hic - cup timeout period of 131ms (typ). Once the hiccup time - out period expires, soft-start is attempted again. Hiccup mode of operation ensures low power dissipation under output short-circuit conditions. The device exits Hiccup mode, if the overcurrent condition is removed or, if input power or EN/UVLO is cycled. Thermal Overload Protection Thermal overload protection limits the total power dis - sipation 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, allow - ing 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: ( ) ( )OUT OUT IN(MIN) OUT MAX OUTIN(MAX) ON(MIN) SW V I 3.05V I 1.8D VV tf +×= +× = × 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 on- time (130ns). Also, for duty cycle > 0.5; VIN(MIN) > ((4.27 × VOUT) − 9.76) 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 (I RMS) is defined by the following equation: ( )OUT IN OUT RMS OUT(MAX) IN V VV II V = × 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, OUT(MAX) RMS(MAX) I I 2= 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 tem - www.maximintegrated.com Maxim Integrated │ 13 MAXM15462 4.5V to 42V, 300mA Himalaya uSLIC Step-Down Power Module

ΔVIN = Allowable input-voltage ripple. resistor-divider from output to FB to GND (see Figure 2). Figure 1. Adjustable EN/UVLO Network Figure 2. Setting the Output Voltage

  • The MAXM15462 has a pulse skip algorithm that allows VOUT to be regulated beyond the VIN(MAX) specified in the above table, up to 42V.

device needs to operate in high ambient temperature. Characteristics section can be used as a guide.

  • 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. VIN(MIN) (V) VIN(MAX) (V) VOUT* (V) CIN COUT (kΩ) (kΩ) IAVG_LIMIT (A) 4.5 12.5 0.9 1 x 1µF 0805 25V (Murata GR219R71E105KA88D) 1 x 47µF 1210 6.3V (Murata GRM32ER70J476KE20L) SHORT OPEN 0.53 4.5 14 1 1 x 1µF 0805 25V (Murata GR219R71E105KA88D) 1 x 47µF 1210 6.3V (Murata GRM32ER70J476KE20L) 8.33 75 0.53 4.5 17 1.2 1 x 1µF 0805 25V (Murata GR219R71E105KA88D) 1 x 47µF 1210 6.3V (Murata GRM32ER70J476KE20L) 25 75 0.52 4.5 21.5 1.5 1 x 1µF 0805 25V (Murata GR219R71E105KA88D) 1 x 22µF 1206 6.3V (Murata GRM31CR70J226KE19L) 50 75 0.51 4.5 25.5 1.8 1 x 1µF 0805 50V (Murata GRM21BR71105KA12L) 1 x 22µF 1206 6.3V (Murata GRM31CR70J226KE19L) 75 75 0.50 4.5 36 2.5 1 x 1µF 0805 50V (Murata GRM21BR71105KA12L) 1 x 22µF 1206 6.3V (Murata GRM31CR70J226KE19L) 133 75 0.48 5.5 42 3.3 1 x 1µF 0805 50V (Murata GRM21BR71105KA12L) 1 x 10µF 1206 6.3V (Murata GRM31CR70J106KA01L) 200 75 0.46 12 42 5 1 x 1µF 0805 50V (Murata GRM21BR71105KA12L) 1 x 10µF 1206 6.3V (Murata GRM31CR70J106KA01L) 348 75 0.42

Table 1. Selection of Components

Figure 3. Layout Guidelines

5.5V TO 42V 3.3V,300mA 1µF 1µF 10µF R1 200kΩ 75kΩ MODE = GND FOR PWM C2 = MURATA 10μF/X7R/6.3V/1206 (GRM31CR70J106KA01L) MODE = OPEN FOR PFM C1 = MURATA 1μF/X7R/50V/0805 (GRM21BR71H105KA12L) C3 = MURATA 1μF/X7R/6.3V/0603 (GRM188R70J105K) MAXM15462 VIN VCC LX GND MODE RESET OUT EN/UVLO FB 12V TO 42V 5V,300mA 1µF 1µF 10µF R1 348kΩ 75kΩ MODE = GND FOR PWM C2 = MURATA 10μF/X7R/6.3V/1206 (GRM31CR70J106KA01L) MODE = OPEN FOR PFM C1 = MURATA 1μF/X7R/50V/0805 (GRM21BR71H105KA12L) C3 = MURATA 1μF/X7R/6.3V/0603 (GRM188R70J105K) Typical Application Circuits Typical Application circuit for 3.3V Output Typical Application circuit for 5V output www.maximintegrated.com Maxim Integrated │ 17 MAXM15462 4.5V to 42V, 300mA Himalaya uSLIC Step-Down Power Module

MAXM15462AMB+ -40°C to +125°C 10-pin uSLIC MAXM15462AMB+T -40°C to +125°C 10-pin uSLIC + Denotes a lead(Pb)-free/RoHS-compliant package. T Denotes tape-and-reel. MAXM15462 VIN VCC LX GND MODE RESET OUT EN/UVLO FB 4.5V TO 21.5V 1.5V,300mA 1µF 1µF 22µF R1 50kΩ 75kΩ MODE = GND FOR PWM C2 = MURATA 22μF/X7R/6.3V/1206 (GRM31CR70J226KE19L) MODE = OPEN FOR PFM C1 = MURATA 1μF/X7R/25V/0805 (GRM219R71E105KA88D) C3 = MURATA 1μF/X7R/6.3V/0603 (GRM188R70J105K) Typical Application circuit for 1.5V output

Ordering Information

www.maximintegrated.com Maxim Integrated │ 18 MAXM15462 4.5V to 42V, 300mA Himalaya uSLIC Step-Down Power Module

0 10/17 Initial release —

0.1 Added trademark information for uSLIC 1–2, 18

1 3/18 Updated General Description, Benefits and Features, Applications, Typical Application Circuit, and Absolute Maximum Ratings sections 1, 2 2 3/18 Updated General Description section. 1

Revision History

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. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2018 Maxim Integrated Products, Inc. │ 19 MAXM15462 4.5V to 42V, 300mA Himalaya uSLIC Step-Down Power Module For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.