Click here for production status of specific part numbers. Evaluates: MAX17506 MAX17506EVKITBE Evaluation Kit 5V Output-Voltage Application General Description Quick Start The MAX17506EVKITBE (EV kit) provides a proven Recommended Equipment design to evaluate the MAX17506 high-voltage, high- MAX17506EVKITBE efficiency, synchronous step-down DC-DC converter. The 6.5V to 60V, 10A DC input power supply EV kit is preset for a 5V output at load currents up to 5A and features a 450kHz switching frequency for Load capable of sinking 5A 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 con- benefits and features, refer to the MAX17506 data sheet. nections are completed. 1) Set the power supply at a voltage between 6V and Features 60V. Disable the power supply. Operates From a 6.5V to 60V Input Supply 2) Connect the positive terminal of the power supply 5V Output Voltage to the VIN PCB pad and the negative terminal to Up to 5A Output Current the nearest PGND PCB pad. Connect the positive 450kHz Switching Frequency terminal of the 5A load to the VOUT PCB pad and the negative terminal to the nearest PGND PCB pad. Enable/UVLO Input, Resistor-Programmable UVLO Threshold 3) Connect the DVM across the VOUT PCB pad and the nearest PGND PCB pad. Adjustable Soft-Start Time 4) Verify that the shunt is installed across pins 1-2 on MODE Pin to Select Among PWM, PFM, or DCM Modes jumper JU1 (see Table 1 for details). Open-Drain RESET Output 5) Select the shunt position on JU2 according to the External Clock Synchronization intended mode of operation (see Table 2 for details). Overcurrent and Overtemperature Protection 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. 319-100431 Rev 0 8/19Evaluates: MAX17506 MAX17506EVKITBE Evaluation Kit 5V Output-Voltage Application Enable/Undervoltage-Lockout (EN/UVLO) Detailed Description Programming The MAX17506EVKITBE provides a proven design to evaluate the MAX17506 high-voltage, high-efficiency, The MAX17506 offers an Enable and adjustable input undervoltage lockout feature. In this EV kit, for normal synchronous step-down DC-DC converter. The EV kit is preset for a 5V output from a 6.5V to 60V input at operation, leave EN/UVLO jumper (JU1) open. When JU1 is left open, the MAX17506 is enabled when the input load currents up to 5A and features a 450kHz switching frequency for optimum efficiency and component size. voltage rises above 6.4V. To disable MAX17506, install a jumper across pins 2-3 on JU1. See Table 1 for JU1 The EV kit includes an EN/UVLO PCB pad and JU1 to settings. The EN/UVLO PCB pad on the EV kit supports enable the output at a desired input voltage. The SYNC external enable/disable control of the device. Leave JU1 PCB pad allows an external clock to synchronize the open when external enable/disable control is desired. device. JU2 allows the selection of a particular mode of A potential divider formed by R1 and R2 sets the input operation based on light-load performance requirements. voltage (V ) above which the converter is enabled An additional RESET PCB pad is available for monitoring INU when JU1 is left open. when the converter output is in regulation. Choose R1 to be 3.32M max, and then calculate R2 as Soft-Start Input (SS) follows: The EV kit offers an adjustable soft-start function to R 1.215 limit inrush current during startup. The soft-start time 1 R = 2 is adjusted by the value of external soft start capacitor (V 1.215) INU C7, connected between SS and SGND. The selected where, output capacitance (C ) and the output voltage (V ) SEL OUT V is the voltage at which the device is required to turn on. determine the minimum value of C7, as shown by the INU following equation: R1 and R2 are in k. -6 For more details about setting the undervoltage lockout C7 28 x 10 x C x V SEL OUT level, refer to the MAX17506 data sheet. The soft-start time (t ) is related to C7 by the following SS equation: Mode Selection (MODE/SYNC) -6 The EV Kit provides a jumper (JU2) that allows the t = C7/(5.55 x 10 ) SS MAX17506 to operate in PWM, PFM, and DCM modes. For example, to program a 2.2ms soft-start time, C7 Refer to MAX17506 data sheet for more details on the should be 12nF. modes of operation. Table 2 shows the Mode Selection (JU2) settings that can be used to configure the desired mode of operation. Table 1. Converter EN/UVLO Jumper (JU1) Settings SHUNT POSITION EN/UVLO PIN MAX17506 OUTPUT 1-2* Connected to VIN Enabled Connected to the center node of Enabled, UVLO level set through the Not installed resistor-divider R1 and R2 R1 and R2 resistors 2-3 Connected to SGND Disabled *Default position. Table 2. Mode Selection (JU2) Settings SHUNT POSITION MODE PIN MAX17506 MODE Not installed* Unconnected PFM mode of operation 1-2 Connected to SGND PWM mode of operation 2-3 Connected to VCC DCM mode of operation *Default position. Maxim Integrated 2 www.maximintegrated.com