Click here for production status of specific part numbers. Evaluates: MAX17630 MAX17630BEVKIT Evaluation Kit 5V Output-Voltage Application General Description Quick Start The MAX17630BEVKIT Evaluation Kit (EV kit) provides Recommended Equipment a proven design to evaluate the MAX17630B high-effi - MAX17630BEVKIT Evaluation Kit ciency, synchronous step-down DC-DC converter. The 6.5V to 36V, 1A DC-input power supply EV kit provides 5V/1A at the output from a 6.5V to 36V input supply. The switching frequency of the EV kit is pre- Load capable of sinking 1A set to 400kHz for optimum efficiency and component size. Digital voltmeter (DVM) The EV kit features adjustable input undervoltage lock- out, adjustable soft-start, open-drain RESET signal, and Equipment Setup and Test Procedure external clock synchronization. The EV kit is optimized The EV kit is fully assembled and tested. Follow the steps for thermal performance. For more details about the IC below to verify the board operation. benefits and features, refer to MAX17630 IC data sheet. Caution: Do not turn on power supply until all con- nections are completed. Features 1) Set the power supply at a voltage between 6.5V and Operates from a 6.5V to 36V Input Supply 36V. Then, disable the power supply. 5V Output Voltage 2) Connect the positive terminal of the power supply to Delivers Up to 1A Output Current the VIN PCB pad and the negative terminal to the 400kHz Switching Frequency nearest PGND PCB pad. Connect the positive ter- minal of the 1A load to the VOUT PCB pad and the Enable/UVLO Input, Resistor-Programmable UVLO negative terminal to the nearest PGND PCB pad. Threshold 3) Connect the DVM across the VOUT PCB pad and Adjustable Soft-Start Time the nearest PGND PCB pad. Open-Drain RESET Output 4) Verify that shunts are installed across pins 1-2 on Overcurrent and Overtemperature Protection jumper JU1 (see Table 1 for details) and pins 2-3 on Proven PCB Layout jumper JU2 (see Table 2 for details) Fully Assembled and Tested 5) Turn on the DC power supply. 6) Enable the load. 7) Verify that the DVM displays 5V. Ordering Information appears at end of data sheet. 319-100372 Rev 0 5/19Evaluates: MAX17630 MAX17630BEVKIT Evaluation Kit 5V Output-Voltage Application For example, in order to program a 1ms soft-start time, C3 Detailed Description should be 5600pF. The EV kit is designed to deliver 5V at load current up to 1A at the output from a 6.5V to 36V input supply. The Enable/Undervoltage-Lockout (EN/UVLO) switching frequency of the EV kit is configured at 400 kHz Programming by leaving RT resistor open. The MAX17630 offers an Enable and adjustable input The EV kit includes an EN/UVLO PCB pad and jumper undervoltage lockout feature. In this EV kit, for normal JU1 to enable the output at a desired input voltage. The operation, leave the EN/UVLO jumper (JU1) open. When MODE/SYNC PCB pad and jumper JU2 allow an external JU1 is left open, the MAX17630 is enabled when the input clock to synchronize the device. Jumper JU2 allows the voltage rises above 6.4V. To disable the MAX17630, install selection of the mode of operation based on light load- a jumper across pins 2-3 on JU1. See Table 1 for JU1 performance requirements. An additional RESET PCB settings. The EN/UVLO PCB pad on the EV kit supports pad is available for monitoring whether the converter external Enable/Disable control of the device. Leave JU1 output is in regulation or not. open when external Enable/Disable control is desired. A potential divider formed by R1 and R2 sets the input Soft-Start Input (SS) voltage (VINU) above which the converter is enabled when The EV kit offers an adjustable soft-start function to limit JU1 is left open. inrush current during the startup. The soft-start time is Choose R1 to be 3.32M (max), and then calculate R2 as adjusted by the value of external soft start capacitor C3, follows: connected between SS and SGND. The selected output capacitance (C ) and the output voltage (V ) deter- SEL OUT R 1.215 1 R = mine the minimum value of C3, as shown by the following 2 V 1.215 ( ) INU equation: -6 where, V is the voltage at which the device is required C3 28 x 10 x C x V INU SEL OUT to turn on, and R1 and R2 are in k. The soft-start time (t ) is related to the soft-start capaci- SS For more details about setting the undervoltage lockout tor C3 by the following equation: level, refer to the MAX17630 data sheet. C3 t = SS -6 5.55 10 ( ) Table 1. Converter EN/UVLO Jumper (JU1) Settings SHUNT POSITION EN/UVLO PIN MAX17630B OUTPUT 1-2 Connected to VIN Enabled Connected to the center node of Enabled, UVLO level is set by the Not installed* resistor-divider R1 and R2 resistor-divider between VIN and SGND 2-3 Connected to SGND Disabled *Default position. Maxim Integrated 2 www.maximintegrated.com