Evaluate: MAX17502E in TDFN Package MAX17502E Evaluation Kit General Description Features The MAX17502E evaluation kit (EV kit) provides a proven Operates from a 4.5V to 60V Input Supply design to evaluate the MAX17502E high-efficiency, high - 3.3V Fixed Output Voltage voltage, synchronous step-down DC-DC converter. The 1A Output Current EV kit uses this device to generate a fixed 3.3V, at load currents up to 1A, from a 4.5V to 60V input supply. The 600kHz Switching Frequency EV kit features a forced-PWM control scheme that pro- Enable/UVLO Input vides constant switching-frequency operation at all load Resistor-Programmable UVLO Threshold and line conditions. Open-Drain RESET Output Overcurrent and Overtemperature Protection Proven PCB Layout Fully Assembled and Tested Ordering Information appears at end of data sheet. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION JU1 1 3-pin header 2.2F 10%, 100V X7R ceramic C1 1 capacitor (1210) 15H, 2A inductor Murata GRM32ER72A225K L1 1 (6mm x 6mm x 3.5mm) Coilcraft LPS6235-153ML 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) R4 1 100 resistor (0402) 3300pF 10%, 50V X7R ceramic C3 1 capacitor (0402) R6 1 10k 1% resistor (0402) Murata GRM155R71H332K TP1, TP2 0 Not installed, test points Buck converter (10 TDFN-EP*) 22F 10%, 10V X7R ceramic U1 1 Maxim MAX17502EATB+ C4 1 capacitor (1210) Murata GRM32ER71A226K 1 Shunt PCB: MAX17502ET 33F, 80V aluminum 1 EVALUATION KIT C7 1 electrolytic (D = 8mm) Panasonic EEEFK1K330P *EP = Exposed pad. 19-6437 Rev 2 11/17Evaluate: MAX17502E in TDFN Package MAX17502E Evaluation Kit 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. To turn on/turn off the part from EN/UVLO, follow the Quick Start steps below: Recommended Equipment 1) Remove resistors R1 and R2 and the jumper installed MAX17502E EV kit across pins 1-2 on jumper JU1. 4.5V to 60V, 2A DC input power supply 2) Connect the power supply to the EV kit and turn on Load capable of sinking 1A the power supply. Set the power supply at a voltage between 4.5V and 60V. Digital voltmeter (DVM) 3) Connect the function generator output to the EN/UVLO Function generator test loop. Procedure 4) EN/UVLO rising threshold is 1.24V and falling thresh- The EV kit is fully assembled and tested. Follow the steps old is 1.11V. Make sure that the voltage-high and below to verify board operation. Caution: Do not turn voltage-low levels of the function generator output are on power supply until all connections are completed. greater than 1.24V and less than 1.11V, respectively. 1) Set the power supply at a voltage between 4.5V and 5) When powering down the EV kits, first disconnect the 60V. Disable the power supply. function generator output from the EN/UVLO test loop 2) Connect the positive terminal of the power supply to and then turn off the DC power supply. the VIN PCB pad and the negative terminal to the Care should be taken in board layout and systems wiring nearest PGND PCB pad. Connect the positive terminal to prevent violation of the absolute maximum rating of the of the 1A load to the VOUT PCB pad and the negative FB/VO pin under short-circuit conditions. Under such con- terminal to the nearest PGND PCB pad. ditions, it is possible for the ceramic output capacitor to 3) Connect the DVM across the VOUT PCB pad and the oscillate with the board or wiring inductance between the nearest PGND PCB pad. capacitor and short-circuited load, and thereby cause the absolute maximum rating of FB/VO (-0.3V) to be exceed- 4) Verify that a shunt is installed across pins 1-2 on ed. This parasitic board or wiring inductance should be jumper JU1. minimized and the output voltage waveform under short- 5) Turn on the DC power supply. circuit operation should be verified to ensure that the 6) Enable the load. absolute maximum rating of FB/VO is not exceeded. This EV kit includes a 100 protection resistor to protect the 7) Verify that the DVM displays the expected voltage. part under conditions where this rating might be exceed- ed, and is not required in applications where the -0.3V (max) is not violated (see the Absolute Maximum Ratings section of the MAX17502 IC data sheet). Maxim Integrated 2 www.maximintegrated.com