Click here for production status of specific part numbers. Evaluates: MAXM17546 5V Output MAXM17546 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-sup- MAXM17546EVKITB evaluation kit ply solutions. The MAXM17546 5V-output evaluation kit 7.5V to 42V DC, 4A power supply (EV kit) is a demonstration circuit of the MAXM17546 42V, 5A high-efficiency, current-mode, synchronous step-down Dummy load capable of sinking 5A DC-DC switching power module. The EV kit operates Digital voltmeter (DVM) over a wide input-voltage of 7.5V to 42V and provides 100MHz dual-trace oscilloscope up to 5A load current with a 5V-output voltage. The EV kit is programmed to switch at a frequency of 450kHz. Equipment Setup and Test Procedure The module is simple to use and easily configurable with The MAXM17546 EV kit is fully assembled and tested. minimal external components. It features cycle-by-cycle Follow the steps below to verify board operation. Caution: peak current-limit protection, under-voltage lockout (EN/ Do not turn on the power supply until all connections UVLO), 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 7.5V and 4.32mm SiP package MAXM17546 module installed and 42V. Disable the power supply. is rated to operate over the full industrial -40C to +125C 2) Connect the positive and negative terminals of the temperature range. power supply to VIN and GND PCB pads, respectively. The MAXM17546 module data sheet provides a complete 3) Connect the positive and negative terminals of the 5A description of the part that should be read in conjunction load to VOUT and GND PCB pads respectively, and with this data sheet prior to operating the EV kit. For full the set the load to 0A. module features, benefits and parameters, refer to the MAXM17546 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 7.5V to 42V Input Range Figure 2 for details). Highly Integrated Solution with Built-In Shielded 6) Select the shunt position on jumper J2 according to the Inductor intended mode of operation (see Table 2 for details). Programmed 5V Output, Up To 5A Output Current 7) Enable the input power supply. All Ceramic Capacitors and Ultra-Compact Solution 8) Verify the DVM display 5V. Selectable PWM, DCM, and PFM Modes 9) Increase the load up to 5A to verify the output voltage Programmable 4ms Soft-Start Time and Prebias is 5V using DVM. Startup 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 Ordering Information appears at end of data sheet. 319-100177 Rev 0 4/18Evaluates: MAXM17546 5V Output MAXM17546 5V Output Evaluation Kit should not be installed across pins 1-2 on JU1 to enable Detailed Description of Hardware the output through an internal pullup 3.32M resistor from The MAXM17546 EV kit is a proven circuit to demonstrate the EN/UVLO pin to the IN pin. To disable the output, the high-voltage, high-efficiency, and compact solution install the shunt across pins 1-2 on JU1 to pull the EN/ size of the MAXM17546 synchronous step-down DC-DC UVLO pin to GND. See Table 1 for JU1 setting details. power module. The output voltage is preset to 5V to oper- The EV kit also provides an R3 resistor to program a ate from 7.5V to 42V input and provides up to 5A load UVLO threshold voltage at which an input-voltage level current. The optimal frequency is set at 450kHz to maxi- device turns on. The R3 resistor can be calculated by the mize efficiency and minimize component size. The EV kit following equation: includes four test points, TP1 for monitoring the RESET, TP2 for measuring the LX voltage, TP3 for monitoring the R3 = 3320 x 1.215/(V 1.215) INU DL voltage and TP4 for measuring the BST voltage. 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 MAXM17546 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 nor- C 28 x 10 x C x V SS SEL OUT mal operation. Refer to the MAXM17546 IC data sheet The soft-start time (t ) is related to the capacitor SS for more information on the PWM, PFM, and DCM modes connected at SS (C ) by the following equation: SS of operation. -6 t = C /(5.55 x 10 ) SS SS Table 2 lists JU2 jumper settings that can be used to where t is in ms and C is in nF. For example, to pro- SS SS configure the desired mode of operation. The internal gram a 4ms soft-start time, a 22nF capacitor should be oscillator of the device can be synchronized to an external connected from the SS pin to SGND. clock signal on the SYNC pin. The external synchroniza- tion clock frequency must be between 1.1 x f and 1.4 x SW Regulator Enable/ f , where f is the frequency of operation set by R4. SW SW Undervoltage-Lockout Level (EN/UVLO) The minimum external clock high pulse width should be The EV kit offers an adjustable input undervoltage-lockout greater than 50ns, while the minimum external clock low level by resistor-dividers connecting between the IN, EN/ pulse width should be greater than 160ns. UVLO, and GND pins. For normal operation, a shunt Table 1. EN/UVLO Enable/Disable Configuration (JU1) SHUNT POSITION EN PIN MAXM17546 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 (JU2) SHUNT POSITION MODE PIN MAXM17546 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