MAX17502F Evaluation Kit Evaluates: MAX17502F in TDFN Package General Description Features The MAX17502F evaluation kit (EV kit) provides a proven Operates from a 7V to 60V Input Supply design to evaluate the MAX17502F high-efficiency, high- 5V Fixed Output Voltage voltage, synchronous step-down DC-DC converter. The 1A Output Current EV kit uses the device to generate a fixed 5V at load cur- rents up to 1A from a 7V to 60V input supply. The device 600kHz Switching Frequency features a forced-PWM control scheme that provides Enable/UVLO Input constant switching-frequency operation at all load and Resistor-Programmable UVLO Threshold line conditions. Open-Drain RESET Output Overcurrent and Overtemperature Protection Proven PCB Layout Ordering Information appears at end of data sheet. Fully Assembled and Tested Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION JU1 1 3-pin header 2.2F 10%, 100V X7R ceramic C1 1 capacitor (1210) 22H, 1.7A inductor Murata GRM32ER72A225K L1 1 (6mm x 6mm x 3.5mm) Coilcraft LPS6235-223ML 1F 10%, 6.3V X7R ceramic C2 1 capacitor (0603) R1 1 3.32M 1% resistor (0402) Murata GRM188R70J105K R2 1 866k 1% resistor (0402) 3300pF 10%, 50V X7R ceramic R4 1 100 resistor (0402) C3 1 capacitor (0402) R6 1 10k 1% resistor (0402) Murata GRM155R71H332K TP1, TP2 0 Not installed, test points 10F 10%, 10V X7R ceramic Buck converter (10 TDFN-EP*) C4 1 capacitor (1210) U1 1 Maxim MAX17502FATB+ Murata GRM32DR71A106K 1 Shunt 33F, 80V aluminum electrolytic PCB: MAX17502FT EVALUATION C7 1 (D = 8mm) 1 KIT Panasonic EEEFK1K330P *EP = Exposed pad. 19-6511 Rev 2 11/17MAX17502F Evaluation Kit Evaluates: MAX17502F in TDFN Package Component Suppliers SUPPLIER PHONE WEBSITE Coilcraft, Inc. 847-639-6400 www.coilcraft.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Panasonic Corp. 800-344-2112 www.panasonic.com Note: Indicate that you are using the MAX17502 when contacting these component suppliers. 4) EN/UVLO rising threshold is 1.24V and falling thresh- Quick Start old is 1.24V. Make sure that the voltage-high and Recommended Equipment voltage-low levels of the function generator output are MAX17502F EV kit greater than 1.24V and less than 1.11V, respectively. 7V to 60V, 2A DC input power supply 5) While powering down the EV kit, first disconnect the function generator output from the EN/UVLO test loop Load capable of sinking 1A and then turn off the DC power supply. Digital voltmeter (DVM) Care should be taken in board layout and systems wiring Function generator to prevent violation of the absolute maximum rating of the FB/VO pin under short-circuit conditions. Under such con- Procedure ditions, it is possible for the ceramic output capacitor to The EV kit is fully assembled and tested. Follow the steps oscillate with the board or wiring inductance between the below to verify the board operation. Caution: Do not turn capacitor and short-circuited load, and thereby cause the on power supply until all connections are completed. absolute maximum rating of FB/VO (-0.3V) to be exceed- 1) Set the power supply at a voltage between 7V and ed. This parasitic board or wiring inductance should be 60V. Disable the power supply. minimized and the output voltage waveform under short- 2) Connect the positive terminal of the power supply to circuit operation should be verified to ensure that the the VIN PCB pad and the negative terminal to the absolute maximum rating of FB/VO is not exceeded. This nearest PGND PCB pad. Connect the positive ter- EV kit includes a 100 protection resistor to protect the minal of the 1A load to the VOUT PCB pad and the part under conditions where this rating may be exceeded, negative terminal to the nearest PGND PCB pad. and is not required in applications where the -0.3V (max) is not violated (see Absolute Maximum Ratings section of 3) Connect the DVM across the VOUT PCB pad and the the MAX17502 IC data sheet). nearest PGND PCB pad. 4) Verify that a shunt is installed across pins 1-2 on Detailed Description of Hardware jumper JU1. The MAX17502F EV kit provides a proven design to 5) Turn on the DC power supply. evaluate the MAX17502F high-efficiency, high-voltage, synchronous step-down DC-DC converter. The EV kit 6) Enable the load. generates a fixed 5V, at load currents up to 1A, from a 7) Verify that the DVM displays the expected voltage. 7V to 60V input supply. The EV kit features a 600kHz To turn-on/off the part from EN/UVLO, follow the steps fixed switching frequency for optimum efficiency and below: component size. The EV kit features a forced-PWM con- 1) Remove resistors R1 and R2 and the jumper installed trol scheme that provides constant switching-frequency across pins 1-2 on jumper JU1. operation at all load and line conditions. 2) Connect the power supply to the EV kit and turn on The EV kit includes an EN/UVLO PCB pad and jumper the power supply. Set the power supply at a voltage JU1 to enable control of the converter output. An addi- between 7V and 60V. tional RESET PCB pad is available for monitoring the converter output. The VCC PCB pad helps measure the 3) Connect the function generator output to the internal LDO voltage. EN/UVLO test loop. Maxim Integrated 2 www.maximintegrated.com