MAX17502G Evaluation Kit Evaluates: MAX17502G in TDFN Package General Description Features The MAX17502G EV kit provides a proven design to S Operates from a 15V to 60V Input Supply evaluate the MAX17502G high-efficiency, high-voltage, S 12V Output Voltage synchronous step-down DC-DC converter in a TDFN S 1A Output Current package. The EV kit generates 12V at load currents up S 600kHz Switching Frequency to 1A from a 15V to 60V input supply. The EV kit fea- tures a 600kHz fixed switching frequency for optimum S Enable/UVLO Input efficiency and component size. The EV kit features a forced- S Resistor-Programmable UVLO Threshold PWM control scheme that provides constant switching- S Open-Drain RESET Output frequency operation at all load and line conditions. S Overcurrent and Overtemperature Protection S Proven PCB Layout S Fully Assembled and Tested Ordering Information appears at end of data sheet. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 2.2FF Q10%, 100V X7R ceramic 12pF Q5%, 50V C0G ceramic C1 1 capacitor (1210) C9 1 capacitor (0402) Murata GRM32ER72A225KA Murata GRM1555C1H120J JU1 1 3-pin header 1FF Q10%, 6.3V X7R ceramic C2 1 capacitor (0603) 47FH, 2A inductor Murata GRM188R70J105K L1 1 (10.5mm x 10.2mm x 3.8mm) Coilcraft MSS1038-473ML 6800pF Q10%, 25V X7R ceramic C3 1 capacitor (0402) R1 1 3.32MI Q1% resistor (0402) Murata GRM155R71E682K R2 1 316kI Q1% resistor (0402) R3 1 20kI Q1% resistor (0402) 10FF Q10%, 16V X7R ceramic C4 1 capacitor (1210) R4 1 174kI Q1% resistor (0402) Murata GRM32DR71C106K R5 1 14kI Q1% resistor (0402) R6 1 100kI Q1% resistor (0402) 2200pF Q10%, 50V X7R ceramic C5 1 capacitor (0402) R7 1 71.5kI Q1% resistor (0402) Murata GRM155R71H222K TP1, TP2 0 Not installed, test points Buck converter (10 TDFN-EP*) 33FF, 80V aluminum electrolytic U1 1 Maxim MAX17502GATB+ C7 1 (D = 8mm) Panasonic EEEFK1K330P 1 Shunt PCB: MAX17502GT EVALUATION Not installed, ceramic capacitor C8 0 1 KIT (1210) *EP = Exposed pad. For pricing, delivery, and ordering information, please contact Maxim Direct at 19-6523 Rev 0 11/12 1-888-629-4642, or visit Maxim Integrateds website at www.maximintegrated.com.MAX17502G Evaluation Kit Evaluates: MAX17502G 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. 3) Connect the function generator output to the EN/UVLO Quick Start test loop. 4) EN/UVLO rising threshold is 1.24V and falling thresh- Recommended Equipment old is 1.11V. Make sure that the voltage-high and MAX17502G EV kit voltage-low levels of the function generator output are 15V to 60V, 2A DC input power supply greater than 1.24V and less than 1.11V, respectively. Load capable of sinking 1A 5) While powering down the EV kit, first disconnect the Digital voltmeter (DVM) function generator output from the EN/UVLO test loop and then turn off the DC power supply. Function generator Procedure Detailed Description of Hardware The EV kit is fully assembled and tested. Follow the The MAX17502G EV kit provides a proven design to steps below to verify the board operation. Caution: Do evaluate the MAX17502G high-efficiency, high-voltage, not turn on power supply until all connections are synchronous step-down DC-DC converter in a TDFN completed. package. The EV kit generates 12V at load currents up 1) Set the power supply at a voltage between 15V and to 1A from a 15V to 60V input supply. The EV kit features 60V. Disable the power supply. a 600kHz fixed switching frequency for optimum effi- 2) Connect the positive terminal of the power supply ciency and component size. The EV kit features a forced- to the VIN PCB pad and the negative terminal to the PWM control scheme that provides constant switching- nearest PGND PCB pad. Connect the positive ter- frequency operation at all load and line conditions. minal of the 1A load to the VOUT PCB pad and the The EV kit includes an EN / UVLO PCB pad to enable negative terminal to the nearest PGND PCB pad. control of the converter output. An additional RESET 3) Connect the DVM across the VOUT PCB pad and the PCB pad is available for monitoring the open-drain logic nearest PGND PCB pad. output. The VCC PCB pad helps measure the internal LDO voltage. 4) Turn on the DC power supply. 5) Enable the load. Soft-Start Input (SS) The device utilizes an adjustable soft-start function to 6) Verify that the DVM displays 12V. limit inrush current during startup. The soft-start time is To turn-on/off the part from EN/UVLO, follow the steps adjusted by the value of C3, the external capacitor from below: SS to GND. To adjust the soft-start time, determine C3 1) Remove resistors R1 and R2. using the following formula: 2) Connect the power supply to the EV kit and turn on C3 = 5.55 x t SS the power supply. Set the power supply at a voltage where t is the required soft-start time in milliseconds SS between 15V and 60V. and C3 is in nanofarads. Maxim Integrated 2