MAX17501G Evaluation Kit Evaluates: MAX17501G in TDFN Package General Description Features The MAX17501G EV kit provides a proven design to S Operates from a 14V to 60V Input Supply evaluate the MAX17501G high-efficiency, high-voltage, S 12V Output Voltage synchronous step-down DC-DC converter in a TDFN S 500mA Output Current package. The EV kit generates 12V at load currents S 600kHz Switching Frequency up to 500mA from a 14V to 60V input supply. The EV kit features a 600kHz fixed switching frequency for S Enable/UVLO Input optimum efficiency and component size. The EV kit S Resistor-Programmable UVLO Threshold features a forced-PWM control scheme that provides S Open-Drain RESET Output constant switching-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 JU1 1 3-pin header 1FF Q10%, 100V X7R ceramic C1 1 capacitor (1206) 100FH, 1A inductor Murata GRM31CR72A105KA L1 1 (7.6mm x 7.6mm x 4.3mm) Cooper Bussmann DR74-101-R 1FF Q10%, 6.3V X7R ceramic C2 1 capacitor (0603) R1 1 3.32MI Q1% resistor (0402) Murata GRM188R70J105K R2 1 316kI Q1% resistor (0402) R3 1 27.4kI Q1% resistor (0402) 6800pF Q10%, 25V X7R ceramic C3 1 capacitor (0402) R4 1 174kI Q1% resistor (0402) Murata GRM155R71E682K R5 1 14kI Q1% resistor (0402) R6 1 100kI Q1% resistor (0402) 4.7FF Q10%, 16V X7R ceramic C4 1 capacitor (1206) R7 1 71.5kI Q1% resistor (0402) Murata GRM31CR71C475K TP1, TP2 0 Not installed, test points Buck converter (10 TDFN-EP*) 1200pF Q10%, 50V X7R ceramic U1 1 Maxim MAX17501GATB+ C5 1 capacitor (0402) Murata GRM155R71H122KA01D 1 Shunt PCB: MAX17501GT EVALUATION 33FF, 80V aluminum electrolytic 1 KIT C7 1 (D = 8mm) Panasonic EEEFK1K330P *EP = Exposed pad. 10pF Q5%, 50V C0G ceramic C9 1 capacitor (0402) Murata GRM1555C1H100J For pricing, delivery, and ordering information, please contact Maxim Direct at 19-6519 Rev 0 11/12 1-888-629-4642, or visit Maxim Integrateds website at www.maximintegrated.com.MAX17501G Evaluation Kit Evaluates: MAX17501G in TDFN Package Component Suppliers SUPPLIER PHONE WEBSITE Cooper Bussmann 916-941-1117 www.cooperet.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 MAX17501 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 MAX17501G EV kit voltage-low levels of the function generator output are 14V to 60V, 1A DC input power supply greater than 1.24V and less than 1.11V, respectively. Load capable of sinking 500mA 5) While powering down the EV kits, 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 MAX17501G EV kit provides a proven design to steps below to verify the board operation. Caution: Do evaluate the MAX17501G high-efficiency, high-voltage, not turn on power supply until all connections are synchronous step-down DC-DC converter. The EV kit completed. generates 12V at load currents up to 500mA from a 1) Set the power supply at a voltage between 14V and 14V to 60V input supply. The EV kit features a 600kHz 60V. Disable the power supply. fixed switching frequency for optimum efficiency and 2) Connect the positive terminal of the power supply component size. The EV kit features a forced-PWM to the VIN PCB pad and the negative terminal to the control scheme that provides constant switching- nearest PGND PCB pad. Connect the positive termi- frequency operation at all load and line conditions. nal of the 500mA 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 14V and 60V. and C3 is in nanofarads. Maxim Integrated 2