Click here for production status of specific part numbers. MAX17574 5V Output Evaluation Kit Evaluates: MAX17574 5V Output-Voltage Application General Description Features The MAX17574 5V output evaluation kit (EV kit) provides Operates from a 6.5V to 60V Input Supply a proven design to evaluate the MAX17574 high-voltage, 5V Output Voltage high-efficiency, synchronous step-down DC-DC converter. Up to 3A Output Current The EV kit is preset for 5V output at load currents up to 3A and features a 500kHz switching frequency for 500kHz Switching Frequency optimum efficiency and component size. The EV kit Enable/UVLO Input, Resistor-Programmable UVLO features adjustable input undervoltage lockout, adjustable Threshold soft-start, open-drain RESET signal, and external Adjustable Soft-Start Time frequency synchronization. MODE/SYNC Pin to Select Among PWM, PFM, or DCM Modes Open-Drain RESET Output Ordering Information appears at end of data sheet. External Frequency Synchronization Overcurrent and Overtemperature Protection Proven PCB Layout Fully Assembled and Tested 19-8745 Rev 2 5/18MAX17574 5V Output Evaluation Kit Evaluates: MAX17574 5V Output-Voltage Application The MAX17574 5V output EV kit provides a proven Quick Start design to evaluate the MAX17574 high-voltage, high- Recommended Equipment efficiency, synchronous step-down DC-DC converter. The MAX17574 5V output EV kit EV kit is preset for 5V output from 6.5V to 60V input at load currents up to 3A and features a 500kHz switching 6.5V to 60V, 5A DC input power supply frequency for optimum efficiency and component size. Load capable of sinking 3A The EV kit includes an EN/UVLO PCB pad and jumper Digital voltmeter (DVM) JU1 to enable the output at a desired input voltage. The SYNC PCB pad allows an external clock to synchronize Procedure the device. Jumper JU2 allows the selection of a The EV kit is fully assembled and tested. Follow the steps particular MODE/SYNC of operation based on light-load below to verify the board operation. Caution: Do not turn performance requirements. An additional RESET PCB on power supply until all connections are completed. pad is available for monitoring whether the converter 1) Set the power supply at a voltage between 6.5V output is in regulation. and 60V. Disable the power supply. Soft-Start Input (SS) 2) Connect the positive terminal of the power supply The device utilizes an adjustable soft-start function to to the VIN PCB pad and the negative terminal to the limit inrush current during startup. The soft-start time is nearest PGND PCB pad. Connect the positive adjusted by the value of C8, the external capacitor from terminal of the 3A load to the VOUT PCB pad and the SS to GND. The selected output capacitance (C ) and negative terminal to the nearest PGND PCB pad. SEL the output voltage (V ) determine the minimum value OUT 3) Connect the DVM across the VOUT PCB pad and of C8, as shown by the following equation: the nearest PGND PCB pad. -6 C8 28 x 10 x C x V SEL OUT 4) Verify that shunts are installed across pins 1-2 on The soft-start time (t ) is related to C8 by the following jumper JU1 (see Table 1 for details). SS equation: 5) Select the shunt position on jumper JU2 according -6 t = C8/(5.55 x 10 ) to the intended mode of operation (see Table 2 for SS details). For example, to program a 1ms soft-start time, C8 should be 5.6nF. 6) Turn on the DC power supply. 7) Enable the load. 8) Verify that the DVM displays 5V. Detailed Description Maxim Integrated 2 www.maximintegrated.com