Click here for production status of specific part numbers. Evaluates: MAX17630 MAX17630C5EVKIT Evaluation Kit 5V Output-Voltage Application General Description Quick Start The MAX17630C5EVKIT Evaluation Kit (EV kit) pro- Recommended Equipment vides a proven design to evaluate the MAX17630C high- MAX17630C5EVKIT Evaluation Kit efficiency, 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 also provides The EV kit is fully assembled and tested. Follow the steps a good layout example, which is optimized for conducted, below to verify the board operation. radiated EMI and thermal performance. For more details Caution: Do not turn on power supply until all con- about the IC benefits and features, refer to the MAX17630 nections are completed. IC data sheet. 1) Set the power supply at a voltage between 6.5V and 36V. Then, disable the power supply. Features Operates from a 6.5V to 36V Input Supply 2) Connect the positive terminal of the power supply to the VIN PCB pad and the negative terminal to the 5V Output Voltage nearest PGND PCB pad. Connect the positive ter- Delivers Up to 1A Output Current minal of the 1A load to the VOUT PCB pad and the 400kHz Switching Frequency negative terminal to the nearest PGND PCB pad. Enable/UVLO Input, Resistor-Programmable UVLO 3) Connect the DVM across the VOUT PCB pad and Threshold the nearest PGND PCB pad. Adjustable Soft-Start Time 4) Verify that shunts are installed across pins 1-2 on jumper JU1 (see Table 1 for details) and pins 2-3 on Open-Drain RESET Output jumper JU2 (see Table 2 for details) Overcurrent and Overtemperature Protection 5) Turn on the DC power supply. Proven PCB Layout 6) Enable the load. Fully Assembled and Tested 7) Verify that the DVM displays 5V. Complies with CISPR22(EN55022) Class B Conducted and Radiated Emissions Ordering Information appears at end of data sheet. 319-100374 Rev 0 5/19Evaluates: MAX17630 MAX17630C5EVKIT Evaluation Kit 5V Output-Voltage Application For example, in order to program a 1ms soft-start time, C3 Detailed Description of Hardware 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 EN/UVLO jumper (JU1) open. When JU1 MODE/SYNC PCB pad and jumper JU2 allow an external is left open, the MAX17630 is enabled when the input volt- clock to synchronize the device. Jumper JU2 allows the age 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 volt- Soft-Start Input (SS) age (V ) above which the converter is enabled when INU 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 MAX17630C 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