Click here for production status of specific part numbers. Evaluates: MAXM17536 5V Output MAXM17536 5V Output Evaluation Kit General Description Quick Start The Himalaya series of voltage regulator ICs and power Recommended Equipment modules enable cooler, smaller, and simpler power-supply MAXM17536EVKIT evaluation kit solutions. The MAXM17536EVKIT 5V-output evaluation 7V to 60V DC, 4A power supply kit (EV kit) is a demonstration circuit of the MAXM17536 60V, 4A high-efficiency, current-mode, synchronous step- Dummy load capable of sinking 4A down DC-DC switching power module. The EV kit operates Digital voltmeter (DVM) over a wide input-voltage of 7V to 60V and provides up 100MHz dual-trace oscilloscope to 4A load current with a 5V-output voltage. The EV kit is programmed to switch at a frequency of 450kHz. The Equipment Setup and Test Procedure module is simple to use and easily configurable with minimal The MAXM17536EVKIT is fully assembled and tested. external components. It features cycle-by-cycle peak Follow the steps below to verify board operation. Caution: current-limit protection, undervoltage lockout (EN/UVLO), Do not turn on the power supply until all connections and thermal shutdown. are completed. The EV kit comes with the compact 29-pin 15mm x 9mm x 1) Set the power supply at a voltage between 7V and 4.32mm SiP package MAXM17536 module installed and 60V. Disable the power supply. is rated to operate over the full industrial -40C to +125C temperature range. 2) Connect the positive and negative terminals of the power supply to VIN and GND PCB pads, respectively. The MAXM17536 module data sheet provides a complete description of the part that should be read in conjunction 3) Connect the positive and negative terminals of the 4A with this data sheet prior to operating the EV kit. For full load to VOUT and GND PCB pads, respectively. Set module features, benefits and parameters, refer to the the load to 0A. MAXM17536 data sheet. 4) Connect the DVM across the VOUT PCB pad and the GND PCB pad. Features 5) Verify that shunts are not installed on jumper J1 (see Wide 7V to 60V Input Range Table 1 for details). Highly Integrated Solution with Built-In Shielded Inductor 6) Select the shunt position on jumper J2 according to the Programmed 5V Output, Up To 4A Output Current intended mode of operation (see Table 2 for details). 450kHz Switching frequency 7) Enable the input power supply. MAXM17536 Offers High 92.1% Efficiency 8) Verify that the DVM displays 5V. (V = 24V, V = 5V, I = 2.5A) IN OUT OUT 9) Increase the load up to 4A to verify the output voltage All Ceramic Capacitors and Ultra-Compact Solution is 5V using DVM. Selectable PWM, DCM, and PFM Modes Programmable 4ms Soft-Start Time and Prebias Startup Ordering Information appears at end of data sheet. Open-Drain RESET Output Pulled Up To 5V V CC Programmable EN/UVLO Threshold Provision for External Frequency Synchronization Hiccup Overcurrent Protection (OCP) Overtemperature Protection (OTP) -40C to +125C Industrial Temperature Range Complies with CISPR22 (EN55022) Class B Conducted and Radiated Emissions 319-100437 Rev 0 9/19Evaluates: MAXM17536 5V Output MAXM17536 5V Output Evaluation Kit should not be installed across pins 1-2 on J1 to enable Detailed Description of Hardware the output through an internal pullup 3.32M resistor from The MAXM17536EVKIT is a proven circuit to demonstrate the EN/UVLO pin to the IN pin. To disable the output, install the high-voltage, high-efficiency, and compact solution the shunt across pins 1-2 on J1 to pull the EN/UVLO pin size of the MAXM17536 synchronous step-down DC-DC to GND. See Table 1 for J1 setting details. The EV kit also power module. The output voltage is preset to 5V to provides an R3 resistor to program a UVLO threshold operate from 7V to 60V input and provides up to 4A load voltage at which an input-voltage level device turns on. current. The optimal frequency is set at 450kHz to The R3 resistor can be calculated by the following equation: maximize efficiency and minimize component size. The R3 = 3320 x 1.215/(V - 1.215) EV kit includes test points, for monitoring the RESET, LX INU voltage, DL voltage, BST, and V voltage. CC where V is the input voltage at which the device is INU required to turn on, and R3 is in k. Soft-Start Input (SS) The MAXM17536 module implements adjustable soft-start MODE/SYNC Selection (MODE) operation to reduce inrush current. A capacitor connected The devices MODE pin can be used to select among the from the SS pin to SGND programs the soft-start time. PWM, PFM, or DCM modes of operation. The logic state The selected output capacitance (C ) and the output SEL of the MODE pin is latched when the V and EN/UVLO CC voltage (V ) determine the minimum required soft-start OUT voltages exceed the respective UVLO rising thresholds capacitor as follows: and all internal voltages are ready to allow LX switching. -6 State changes on the MODE pin are ignored during C 28 x 10 x C x V SS SEL OUT normal operation. Refer to the MAXM17536 module data The soft-start time (t ) is related to the capacitor SS sheet for more information on the PWM, PFM, and DCM connected at SS (C ) by the following equation: SS modes of operation. t = C /(5.55) SS SS Table 2 lists J2 jumper settings that can be used to configure where t is in ms and C is in nF. For example, to SS SS the desired mode of operation. The internal oscillator of program a 4ms soft-start time, a 22nF capacitor should be the device can be synchronized to an external clock signal connected from the SS pin to SGND. on the SYNC pin. The external synchronization clock frequency must be between 1.1 x f and 1.4 x f , SW SW Regulator Enable/Undervoltage-Lockout Level where f is the frequency of operation set by R4. The SW (EN/UVLO) minimum external clock high pulse width should be greater The EV kit offers an adjustable input undervoltage-lockout than 50ns, while the minimum external clock low pulse level by resistor-dividers connecting between the IN, EN/ width should be greater than 160ns. UVLO, and GND pins. For normal operation, a shunt Table 1. EN/UVLO Enable/Disable Configuration (J1) SHUNT POSITION EN PIN MAXM17536 OUTPUT 1-2 Connected to GND Disabled Connected to the center node of Enabled, UVLO level set through Not installed* resistor-divider 3.32M and R3 the 3.32M and R3 resistors *Default position Table 2. MODE Description (J2) SHUNT POSITION MODE PIN MAXM17536 MODE Not installed Unconnected PFM mode of operation 1-2 Connected to V DCM mode of operation CC 2-3* Connected to GND PWM mode of operation *Default position Maxim Integrated 2 www.maximintegrated.com