Evaluates: MAX17504 in MAX17504 5V Output Evaluation Kit 5V Output-Voltage Application General Description Features The MAX17504 5V output evaluation kit (EV kit) provides Operates from a 7.5V to 60V Input Supply a proven design to evaluate the MAX17504 high-voltage, 5V Output V oltage high-efficiency, synchronous step-down DC-DC convert- Up to 3.5A Output Current er. The EV kit is preset for 5V output at load currents up 500kHz Switching Frequency to 3.5A and features a 500kHz switching frequency for optimum efficiency and component size. The EV kit Enable/UVLO Input, Resistor-Programmable UVLO features adjustable input undervoltage lockout, adjust- Threshold able soft-start, open-drain RESET signal, and external Adjustable Soft-Start Time frequency synchronization. MODE Pin to Select Among PWM, PFM, or DCM Modes Ordering Information appears at end of data sheet. Open-Drain RESET Output External Frequency Synchronization Overcurrent and Overtemperature Protection Proven PCB Layout Fully Assembled and Tested Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 10H, 5.5A inductor 2.2F 10%, 100V X7R ceramic L1 1 TDK SLF12575T-100M5R4-H C1, C8 2 capacitors (1210) Taiyo Yuden NS10165T100MNA Murata GRM32ER72A225KA35 R1 1 3.32M 1% resistor (0402) 2.2F 10%, 10V X7R ceramic R2 1 604k 1% resistor (0402) C2 1 capacitor (0603) Murata GRM188R71A225K R3 1 100k 1% resistor (0402) R4 1 22.1k 1% resistor (0402) 12000pF 10%, 16V X7R ceramic C3 1 capacitor (0402) R5 0 Not installed, resistor (0402) Murata GRM155R71C123K R6 1 10k 1% resistor (0402) 22F 10%, 10V X7R ceramic TP1, TP2 2 Test pads C4, C9 2 capacitors (1210) Buck converter (20 TQFN-EP*) U1 1 Murata GRM32ER71A226K Maxim MAX17504ATP+ 0.1F 10%, 16V X7R ceramic 3 Shunts (JU1JU3) C5 1 capacitor (0402) PCB: MAX17504 5V Output 1 Murata GRM155R71C104K EVKIT Not installed, ceramic capacitor *EP = Exposed pad. C6 0 (0402) Note: C7, R1, and R2 are optional components R1 and R2 47F, 80V aluminum electrolytic are not needed if the EN/UVLO pin is permanently connected to VIN. The electrolytic capacitor (C7) is required only when C7 1 capacitor (D = 10mm) the VIN power supply is situated far from the MAX17504-based Panasonic EEEFK1K470P circuit. When R5 is open, the device switches at 500kHz switch- JU1JU3 3 3-pin headers ing frequency. The SLF12575 inductor has been used to prepare the EV kit test report. 19-6889 Rev 1 2/14Evaluates: MAX17504 in MAX17504 5V Output Evaluation Kit 5V Output-Voltage Application Component Suppliers SUPPLIER PHONE WEBSITE Murata Americas 800-241-6574 www.murataamericas.com Panasonic Corp. 800-344-2112 www.panasonic.com Taiyo Yuden 800-348-2496 www.t-yuden.com TDK Corporation 847-699-2299 www.tdk.com Note: Indicate that you are using the MAX17504 when contacting these component suppliers. Quick Start Detailed Description The MAX17504 5V output EV kit provides a proven Recommended Equipment design to evaluate the MAX17504 high-voltage, high- MAX17504 5V output EV kit efficiency, synchronous step-down DC-DC converter. The 7.5V to 60V, 7A DC input power supply EV kit is preset for 5V output from 7.5V to 60V input at load currents up to 3.5A and features a 500kHz switching Load capable of sinking 3.5A frequency for optimum efficiency and component size. Digital voltmeter (DVM) The EV kit includes an EN/UVLO PCB pad and jumper Procedure JU1 to enable the output at a desired input voltage. The The EV kit is fully assembled and tested. Follow the steps SYNC PCB pad and jumper JU3 allow an external clock to synchronize the device. Jumper JU2 allows the selec- below to verify the board operation. Caution: Do not turn on power supply until all connections are completed. tion of a particular mode of operation based on light-load performance requirements. An additional RESET PCB 1) Set the power supply at a voltage between 7.5V and pad is available for monitoring whether the converter out- 60V. Disable the power supply. put is in regulation. 2) Connect the positive terminal of the power supply to Soft-Start Input (SS) the VIN PCB pad and the negative terminal to the nearest PGND PCB pad. Connect the positive terminal The device utilizes an adjustable soft-start function to of the 3.5A load to the VOUT PCB pad and the nega- limit inrush current during startup. The soft-start time is tive terminal to the nearest PGND PCB pad. adjusted by the value of C3, the external capacitor from SS to GND. The selected output capacitance (C ) and SEL 3) Connect the DVM across the VOUT PCB pad and the the output voltage (V ) determine the minimum value OUT nearest PGND PCB pad. of C3, as shown by the following equation: 4) Verify that shunts are installed across pins 1-2 on -6 C3 28 x 10 x C x V SEL OUT jumper JU1 and pins 2-3 on jumper JU3 (see Tables 1 The soft-start time (t ) is related to C3 by the following SS and 3 for details). equation: 5) Select the shunt position on jumper JU2 according -6 t = C3/(5.55 x 10 ) SS to the intended mode of operation (see Table 2 for For example, to program a 2.2mS soft-start time, C3 details). should be 12nF. 6) Turn on the DC power supply. 7) Enable the load. 8) Verify that the DVM displays 5V. Maxim Integrated 2 www.maximintegrated.com