Click here for production status of specific part numbers. MAX17503EVKITBE Evaluation Kit Evaluates: MAX17503 in 5V Output-Voltage Application General Description Quick Start The MAX17503EVKITBE evaluation kit (EV kit) provides Recommended Equipment a proven design to evaluate the MAX17503 high-voltage, MAX17503EVKITBE high-efficiency, synchronous step-down DC-DC convert- 6.5V to 60V, 5A DC input power supply er. The EV kit is preset for 5V output at load currents up to 2.5A and features a 500kHz switching frequency Load capable of sinking 2.5A for optimum efficiency and component size. The EV kit Digital voltmeter (DVM) features adjustable input undervoltage lockout, adjustable soft-start, open-drain RESET signal, and external clock Equipment Setup and Test Procedure synchronization. The EV kit also provides a good layout The EV kit is fully assembled and tested. Follow the steps example which is optimized for conducted, radiated EMI, below to verify the board operation. and thermal performance. For more details about the IC Caution: Do not turn on power supply until all benefits and features, refer to the MAX17503 IC data connections are completed. sheet. 1) Set the power supply at a voltage between 6.5V and 60V. Disable the power supply. Features 2) Connect the positive terminal of the power supply Operates from a 6.5V to 60V Input Supply to the VIN PCB pad and the negative terminal to Programmed 5V Output Voltage, 2.5A Load Current the nearest PGND PCB pad. Connect the positive 500kHz Switching Frequency terminal of the 2.5A load to the VOUT PCB pad and Enable/UVLO Input, Resistor-Programmable UVLO the negative terminal to the nearest PGND PCB pad. Threshold 3) Connect the DVM across the VOUT PCB pad and the nearest PGND PCB pad. Adjustable Soft-Start Time 4) Verify that shunts are installed across pins 1-2 on MODE Pin to Select Among PWM, PFM, or DCM jumper JU1 and pins 2-3 on jumper JU3 Modes (see Tables 1 and 3 for details). Open-Drain RESET Output 5) Select the shunt position on jumper JU2 according External Clock Synchronization to the intended mode of operation (see Table 2 for Overcurrent and Overtemperature Protection details). 6) Turn on the DC power supply. Proven PCB Layout 7) Enable the load. Fully Assembled and Tested 8) Verify that the DVM displays 5V. Complies with CISPR22(EN55022) Class B Conducted and Radiated Emissions Ordering Information appears at end of data sheet. 319-100341 Rev 0 4/19MAX17503EVKITBE Evaluation Kit Evaluates: MAX17503 in 5V Output-Voltage Application Choose R1 to be 3.32M (max), and then calculate R2 Detailed Description as follows: The MAX17503EVKITBE provides a proven design to evaluate the MAX17503 high-voltage, high-efficiency, R 1.215 1 synchronous step-down DC-DC converter. The EV kit R = 2 (V 1.215) INU is preset for 5V output from 6.5V to 60V input at load currents up to 2.5A and features a 500kHz switching where, V is the voltage at which the device is required INU frequency for optimum efficiency and component size. to turn on, and R1 and R2 are in k. The EV kit includes an EN/UVLO PCB pad and jumper For more details about setting the undervoltage lockout JU1 to enable the output at a desired input voltage. level, refer to the MAX17503 data sheet. The SYNC PCB pad and jumper JU3 allow an external clock to synchronize the device. Jumper JU2 allows the Mode Selection (MODE) selection of a particular mode of operation based on light- The EV kit provides a jumper (JU2) that allows the load performance requirements. An additional RESET MAX17503 to operate in PWM, PFM, and DCM modes. PCB pad is available for monitoring whether the converter Refer to the MAX17503 data sheet for more details on the output is in regulation. modes of operation. Table 2 shows the mode selection (JU2) settings that can Soft-Start Input (SS) be used to configure the desired mode of operation. The EV kit offers an adjustable soft-start function to limit inrush current during startup. The soft-start time is adjusted by the value of external soft-start capacitor Table 1. Converter EN/UVLO Jumper (C10) connected between SS and SGND. The selected (JU1) Settings output capacitance (C ) and the output voltage (V ) SEL OUT determine the minimum value of C10, as shown by the SHUNT EN/UVLO PIN MAX17503 OUTPUT following equation: POSITION -6 C10 28 x 10 x C x V SEL OUT 1-2* Connected to VIN Enabled The soft-start time (t ) is related to C10 by the following SS Connected to the equation: Enabled, UVLO level Not center node of set through the R1 and -6 t = C10/(5.55 x 10 ) SS installed resistor-divider R1 R2 resistors and R2 For example, to program a 1ms soft-start time, C10 should be 5.6nF. 2-3 Connected to SGND Disabled Enable/Undervoltage-Lockout (EN/UVLO) *Default position. Programming Table 2. Mode Selection (JU2) Settings The MAX17503 offers an Enable and adjustable input undervoltage lockout feature. In this EV kit, for normal SHUNT operation, leave the EN/UVLO jumper (JU1) open. When MODE PIN MAX17503 MODE POSITION JU1 is left open, the MAX17503 is enabled when the input voltage rises above 6.4V. To disable the MAX17503, PFM mode of Not installed* Unconnected install a jumper across pins 23 on JU1. See Table 1 operation for JU1 settings. The EN/UVLO PCB pad on the EV kit Connected to PWM mode of 2-3 supports external Enable/Disable control of the device. SGND operation Leave JU1 open when external Enable/Disable control is Connected to DCM mode of desired. A potential divider formed by R1 and R2 sets the 1-2 VCC operation input voltage (V ) above which the converter is enabled INU *Default position. when JU1 is left open. Maxim Integrated 2 www.maximintegrated.com