MAXM15068AMB

MAXM15068 MAXIM

Document overview

• Manufacturer or author: Provided By digicamel.com
• PDF pages: 18

Technical content

The Himalaya series of voltage regulator ICs and power modules enable cooler, smaller, and simpler power- supply solutions. The MAXM15068 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 7.5V to 60V input and delivers up to 200mA output current over a programmable output voltage from 5V to 12V. The module significantly reduces design complexity, manufacturing risks, and offers a true plug and play power/supply solution, reducing time-to- market. The MAXM15068 employs peak-current-mode control architecture. To reduce input inrush current, the device offers a fixed 3.75ms soft-start time. The MAXM15068 module is available in a low profile, com- pact 10-pin, 2.6mm × 3mm × 1.5mm, uSLIC™ package.

Applications

• Industrial Sensors and Process Control
• 4-20mA Current-Loop Powered Sensors
• LDO Replacement
• HVAC and Building Control
• Battery-Powered Equipment
• General Purpose Point-of-Load Ordering Information appears at end of data sheet. 19-100645; Rev 0; 9/19 Benefits and Features
• Easy to Use
• Wide 7.5V to 60V Input Range
• Adjustable 5V to 12V Output
• ±1.44% Feedback Accuracy
• Up to 200mA 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 uSLIC is a trademark of Maxim Integrated Products, Inc. Typical Application Circuit MAXM15068 VIN VCC LX GND MODE RESET OUT EN/UVLO FB 15.5V to 60V 12V, 200mA CIN 1µF 1µF COUT 4.7µF 931kΩ 75kΩ VIN VOUT 2.2MΩ 191kΩ Click here for production status of specific part numbers. MAXM15068 7.5V to 60V, 200mA 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) 41.5°C/W Note 1: Junction temperature greater than +125°C degrades operating lifetimes. Note 2: Package thermal resistances are measured on an evaluation board with natural convection. 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. 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

www.maximintegrated.com Maxim Integrated │ 2 MAXM15068 7.5V to 60V, 200mA 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) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS INPUT SUPPLY (VIN) Input-Voltage Range VIN 7.5 60 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 90 160 μA IQ-PWM Normal switching mode, MODE = 0 3.4 mA ENABLE/UVLO (EN/UVLO) EN/UVLO Threshold VENR VEN/UVLO rising 1.19 1.215 1.28 V VENF VEN/UVLO falling 1.06 1.09 1.16 EN/UVLO Input leakage-Current IEN/UVLO TA = +25° C -100 +100 nA LDO (VCC) VCC Output-Voltage Range VCC 7.5V < VIN < 60V, 0mA < IVCC < 10mA 4.75 5 5.25 V VCC Current Limit IVCC-MAX VCC = 4.3V 13 30 50 mA 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 3.5 3.75 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 515 550 585 kHz FB Undervoltage Trip Level to Cause Hiccup 62.5 64.5 66.5 % Hiccup Timeout 120 ms Minimum On-Time tON-MIN 90 120 ns Maximum Duty Cycle DMAX FB = 0.98 x FBREG 89 91.4 94 %

Electrical Characteristics

www.maximintegrated.com Maxim Integrated │ 3 MAXM15068 7.5V to 60V, 200mA 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 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 1.9 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 │ 4 MAXM15068 7.5V to 60V, 200mA Himalaya uSLIC Step-Down Power Module

(VIN = V EN/UVLO = 24V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +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.) Typical Operating Characteristics 100 0 20 40 60 80 100 120 140 160 180 200 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT VOUT = 5V, PWM MODE toc01 VIN = 24V VIN = 12V VIN = 36V VIN = 48V VIN = 60V VIN = 7.5V 100 0 20 40 60 80 100 120 140 160 180 200 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT VOUT = 12V, PWM MODE toc02 VIN = 24V VIN = 15.5V VIN = 36V VIN = 48V VIN = 60V 100 1 10 100 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT VOUT = 5V, PFM MODE toc03 VIN = 12V VIN = 7.5V VIN = 36V VIN = 48V VIN = 60V VIN = 24V 100 1 10 100 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT VOUT = 12V, PFM MODE toc04 VIN = 15.5V VIN = 36V VIN = 48V VIN = 60V VIN = 24V 5.0340 5.0345 5.0350 5.0355 5.0360 5.0365 5.0370 5.0375 5.0380 5.0385 5.0390 0 20 40 60 80 100 120 140 160 180 200 OUTPUT VOLTAGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT VOUT = 5V, PWM MODE toc05 VIN = 36V VIN = 24V VIN = 12V VIN = 48V VIN = 60V VIN = 7.5V 12.012 12.014 12.016 12.018 12.020 12.022 12.024 12.026 12.028 12.030 0 20 40 60 80 100 120 140 160 180 200 OUTPUT VOLTAGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT VOUT = 12V, PWM MODE toc06 VIN = 36V VIN = 24V VIN = 15.5V VIN = 48V VIN = 60V 5.016 5.028 5.040 5.052 5.064 5.076 5.088 5.100 5.112 5.124 5.136 0 20 40 60 80 100 120 140 160 180 200 OUTPUT VOLTAGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT VOUT = 5V, PFM MODE toc07 VIN = 36V VIN = 24V VIN = 12V VIN = 48V VIN = 60V VIN = 7.5V 11.96 12.00 12.04 12.08 12.12 12.16 12.20 12.24 12.28 0 20 40 60 80 100 120 140 160 180 200 OUTPUT VOLTAGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT VOUT = 12V, PFM MODE toc08 VIN = 36V VIN = 24V VIN = 15.5V VIN = 48V VIN = 60V toc09 2µs/div VOUT(AC) 10mV/div OUTPUT VOLTAGE RIPPLE VIN = 24V, VOUT = 5V FULL LOAD, PWM MODE Maxim Integrated │ 5 www.maximintegrated.com MAXM15068 7.5V to 60V, 200mA Himalaya uSLIC Step-Down Power Module

(VIN = V EN/UVLO = 24V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +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.) Typical Operating Characteristics (continued) toc10 2µs/div VOUT(AC) 10mV/div OUTPUT VOLTAGE RIPPLE VIN = 24V, VOUT = 12V FULL LOAD, PWM MODE toc11 2µs/div VIN(AC) 50mV/div INTPUT VOLTAGE RIPPLE VIN = 24V, VOUT = 5V FULL LOAD, PWM MODE toc12 2µs/div VIN(AC) 50mV/div INTPUT VOLTAGE RIPPLE VIN = 24V, VOUT = 12V FULL LOAD, PWM MODE 100mV/div 50mA/div toc13 100µs/div VOUT(AC) IOUT LOAD TRANSIENT RESPONSE VIN = 24V, VOUT = 5V, PFM MODE LOAD STEP BETWEEN 5mA TO 50mA 100mV/div 100mA/div toc14 100µs/div VOUT(AC) IOUT LOAD TRANSIENT RESPONSE VIN = 24V, VOUT = 5V, PWM MODE LOAD STEP BETWEEN 100mA TO 200mA 200mV/div 50mA/div toc15 100µs/div VOUT(AC) IOUT LOAD TRANSIENT RESPONSE VIN = 24V, VOUT = 12V, PFM MODE LOAD STEP BETWEEN 5mA TO 50mA 200mV/div 100mA/div toc16 100µs/div VOUT(AC) IOUT LOAD TRANSIENT RESPONSE VIN = 24V, VOUT = 12V, PWM MODE LOAD STEP BETWEEN 100mA TO 200mA 5V/div toc17 1ms/div EN/UVLO VOUT 20V/div 2V/div STARTUP THROUGH ENABLE VIN = 24V, VOUT = 5V FULL LOAD, PWM MODE LX 2V/div RESET 5V/div toc18 EN/UVLO VOUT 20V/div 2V/div SHUTDOWN THROUGH ENABLE VIN = 24V, VOUT = 5V FULL LOAD, PWM MODE LX 2V/div RESET 100µs/div Maxim Integrated │ 6 www.maximintegrated.com MAXM15068 7.5V to 60V, 200mA Himalaya uSLIC Step-Down Power Module

(VIN = V EN/UVLO = 24V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +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.) Typical Operating Characteristics (continued) 5V/div toc19 EN/UVLO VOUT 20V/div 2V/div STARTUP THROUGH ENABLE (2V PREBIAS) VIN = 24V, VOUT = 5V NO LOAD, PWM MODE LX 2V/div RESET 1ms/div 5V/div toc20 EN/UVLO VOUT 20V/div 2V/div STARTUP THROUGH ENABLE (2V PREBIAS) VIN = 24V, VOUT = 5V NO LOAD, PFM MODE LX 2V/div RESET 1ms/div 5V/div toc21 1ms/div EN/UVLO VOUT 20V/div 2V/div STARTUP THROUGH ENABLE VIN = 24V, VOUT = 12V FULL LOAD, PWM MODE LX 5V/div RESET 5V/div toc22 EN/UVLO VOUT 20V/div 2V/div SHUTDOWN THROUGH ENABLE VIN = 24V, VOUT = 12V FULL LOAD, PWM MODE LX 5V/div RESET 100µs/div 5V/div toc23 EN/UVLO VOUT 20V/div 2V/div STARTUP THROUGH ENABLE (5V PREBIAS) VIN = 24V, VOUT = 12V NO LOAD, PWM MODE LX 5V/div RESET 1ms/div 5V/div toc24 EN/UVLO VOUT 20V/div 2V/div STARTUP THROUGH ENABLE (5V PREBIAS) VIN = 24V, VOUT = 12V NO LOAD, PFM MODE LX 5V/div RESET 1ms/div 2V/div toc25 1ms/div VIN VCC 20V/div 20V/div STARTUP THROUGH VIN VIN = 24V, VOUT = 5V FULL LOAD, PWM MODE LX 2V/div VOUT 2V/div toc26 1ms/div VIN VCC 20V/div 20V/div SHUTDOWN THROUGH VIN VIN = 24V, VOUT = 5V FULL LOAD, PWM MODE LX 2V/div VOUT 5V/div toc27 1ms/div VIN VCC 20V/div 20V/div STARTUP THROUGH VIN VIN = 24V, VOUT = 12V FULL LOAD, PWM MODE LX 2V/div VOUT Maxim Integrated │ 7 www.maximintegrated.com MAXM15068 7.5V to 60V, 200mA Himalaya uSLIC Step-Down Power Module

(VIN = V EN/UVLO = 24V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +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.) Typical Operating Characteristics (continued) 5V/div toc28 1ms/div VIN VCC 20V/div 20V/div SHUTDOWN THROUGH VIN VIN = 24V, VOUT = 12V FULL LOAD, PWM MODE LX 2V/div VOUT 20V/div toc29 20ms/div SHORT VOUT 5V/div OUTPUT SHORT IN STEADY STATE VIN = 24V, VOUT = 5V FULL LOAD, PWM MODE 5V/div LX IOUT 500mA/div 20V/div toc30 20ms/div VIN VOUT 20mV/div OUTPUT SHORT DURING STARTUP VIN = 24V, VOUT = 5V FULL LOAD, PWM MODE 20V/div LX IOUT 10mA/div 20V/div toc31 20ms/div SHORT VOUT 10V/div OUTPUT SHORT IN STEADY STATE VIN = 24V, VOUT = 12V FULL LOAD, PWM MODE 5V/div LX IOUT 500mA/div 20V/div toc32 20ms/div VIN VOUT 20mV/div OUTPUT SHORT DURING STARTUP VIN = 24V, VOUT = 12V FULL LOAD, PWM MODE 20V/div LX IOUT 10mA/div Maxim Integrated │ 8 www.maximintegrated.com MAXM15068 7.5V to 60V, 200mA Himalaya uSLIC Step-Down Power Module

(VIN = V EN/UVLO = 24V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +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.) Typical Operating Characteristics (continued) -80 -60 -40 -20 100 1k 10k 100k -80 -60 -40 -20 100 PHASE MARGIN (◦) GAIN (dB) FREQUENCY (Hz) GAIN toc33 PHASE CROSSOVER FREQUENCY = 25.642kHz PHASE MARGIN = 53.439° BODE PLOT VIN = 24V, VOUT = 5V FULL LOAD, PWM MODE -80 -60 -40 -20 100 1k 10k 100k -80 -60 -40 -20 100 PHASE MARGIN (◦) GAIN (dB) FREQUENCY (Hz) GAIN toc34 PHASE CROSSOVER FREQUENCY = 18.440kHz PHASE MARGIN = 53.679 ° BODE PLOT VIN = 24V, VOUT = 12V FULL LOAD, PWM MODE 100 150 200 250 50 70 90 110 130 OUTPUT CURRENT (mA) AMBIENT TEMPERATURE (°C) OUTPUT CURRENT vs. AMBIENT TEMPERATURE toc35 VOUT = 12V VOUT = 5V toc37 FREQUENCY(Hz) RADIATED EMISSION PLOT LEMI_1 = SHORT, CEMI_1 = CEMI_2 = OPEN MAGNITUDE (dBµV/m) -10 CONDITIONS : VIN = 24V, VOUT = 12V, IOUT = 0.2A FROM MAXM15068EVKIT# 30M 100M 1G HORIZONTAL SCAN CISPR-22 CLASS B QP LIMIT VERTICAL SCAN Maxim Integrated │ 9 www.maximintegrated.com MAXM15068 7.5V to 60V, 200mA 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 MAXM15068 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 1.9ms 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 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 MAXM15068 VIN VCC LX GND MODE RESET OUT EN/UVLO FB VIN 5 6 TOP VIEW ‘+’ INDICATES PIN 1 OF THE MODULE 10-PIN (2.6mm × 3mm × 1.5mm) Pin Description www.maximintegrated.com Maxim Integrated │ 10 MAXM15068 7.5V to 60V, 200mA Himalaya uSLIC Step-Down Power Module

1.215V MAXM15068 68µH 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 MAXM15068 7.5V to 60V, 200mA Himalaya uSLIC Step-Down Power Module

The MAXM15068 module is a high-voltage, syn chronous step-down DC-DC module with integrated MOSFETs and inductor, that operates over a wide 7.5V to 60V input voltage range. The module delivers output current up to 200mA over a programmable output-voltage range of 5V to 12V. When EN/UVLO and VCC 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 1.9ms after the output voltage reaches 95.5% of regulation. The device selects 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 device enters 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 constant-frequency PWM mode at all loads. State chang- es on the MODE pin are ignored during normal operation. PWM Mode In PWM mode, the module output current is allowed to go negative. PWM mode is useful in frequency sensi - tive applications and provides fixed switching frequency operation at all loads. PFM Mode PFM mode disables negative output current from the mod- ule, and skips pulses at light loads for better efficiency. In PFM mode, the module output current is forced to a fixed peak of 60mA 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 60mA peak. At light loads, PFM mode gives higher efficiency compared to PWM mode 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. An undervoltage lockout circuit disables the buck converter when V CC 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 3.75ms (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 MAXM15068 7.5V to 60V, 200mA 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 1.9ms 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 overcurrent is detected or if the FB node goes below 64.5% of its nominal regulation threshold, the device enters hiccup mode of operation. In hiccup mode, the device is protect - ed by suspending switching for a hiccup timeout period of 120ms (typ). Once the hiccup timeout 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 overcur - rent condition is removed or if VIN or EN/UVLO is cycled. 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, 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: + 0.4 VIN(MAX) = VOUT tON(MIN)×fSW where: VOUT = Steady-state output voltage, IOUT = Maximum load current, fSW = Worst-case switching frequency (585 kHz), DMAX = Maximum duty cycle (0.89), tON(MIN) = Worst-case minimum controllable switch on- time (120ns). 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: IRMS = IOUT(MAX) × √VOUT×(VIN−VOUT) VIN where IOUT(MAX) is the maximum load current. IRMS has a maximum value when the input voltage equals twice the output voltage (VIN = 2 × VOUT). So, IRMS(MAX) = IOUT(MAX) Choose an input capacitor that exhibits less than +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 - perature stability. Calculate the input capacitance using the following equation: CIN = IOUT(MAX)×DMAX×(1−DMAX) fSW× ∆VIN where: DMAX = Maximum duty cycle (0.89), fSW = Switching frequency, ∆VIN = Allowable input-voltage ripple. www.maximintegrated.com Maxim Integrated │ 13 MAXM15068 7.5V to 60V, 200mA Himalaya uSLIC Step-Down Power Module

• Keep the input capacitors as close as possible to the VIN 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 EV kit layout for first-pass success.

Figure 3. Layout Guidelines

MODE = GND FOR PWM C2 = MURATA 4.7μF/X7R/25V/0805 (GRM21BZ71E475KE15) MODE = OPEN FOR PFM C1 = TAIYO YUDEN 1μ F/X7R/100V/1206 (HMK316B7105KLH) C3 = TAIYO YUDEN 1μF/X7R/16V/0603 (EMK107B7105KA) MAXM15068 VIN VCC LX GND MODE RESET OUT EN/UVLO FB 15.5V to 60V 12V, 200mA 1µF 1µF 4.7µF 931kΩ 75kΩ VIN VOUT 2.2MΩ 191kΩ MODE = GND FOR PWM C2 = MURATA 10μF/X7R/16V/0805 (GRM21BZ71C106KE15) MODE = OPEN FOR PFM C3 = TAIYO YUDEN 1μF/X7R/16V/0603 (EMK107B7105KA) MAXM15068 VIN VCC LX GND MODE RESET OUT EN/UVLO FB 7.5V to 60V 5V, 200mA 1µF 1µF 10µF 348kΩ 75kΩ VIN VOUT 2.2MΩ 442kΩ C1 = TAIYO YUDEN 1μ F/X7R/100V/1206 (HMK316B7105KLH) Typical Application Circuits Typical Application Circuit for 12V Output Typical Application Circuit for 5V Output www.maximintegrated.com Maxim Integrated │ 16 MAXM15068 7.5V to 60V, 200mA Himalaya uSLIC Step-Down Power Module

PART NUMBER TEMP RANGE PIN-PACKAGE MAXM15068AMB+ -40°C to +125°C 10-pin uSLIC MAXM15068AMB+T -40°C to +125°C 10-pin uSLIC +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel.

Ordering Information

www.maximintegrated.com Maxim Integrated │ 17 MAXM15068 7.5V to 60V, 200mA Himalaya uSLIC Step-Down Power Module

0 9/19 Initial release —

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. © 2019 Maxim Integrated Products, Inc. │ 18 MAXM15068 7.5V to 60V, 200mA Himalaya uSLIC Step-Down Power Module For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.