Click here for production status of specific part numbers. Evaluates: MAX17536 MAX17536EVKITB Evaluation Kit 5V Output-Voltage Application General Description Quick Start The MAX17536 5V output evaluation kit (EV kit) provides Recommended Equipment a proven design to evaluate this high-voltage, high- MAX17536EVKITB 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 4A and features a 450kHz switching frequency for optimum Load capable of sinking 4A efficiency and component size. The EV kit features adjustable Digital voltmeter (DVM) input, undervoltage lockout, adjustable soft-start, open-drain RESET signal, and external frequency synchronization. Procedure The EV kit is fully assembled and tested. Follow the steps Features below to verify board operation. Caution: Do not turn Operates from a 6.5V to 60V Input Supply on power supply until all connections are completed. 5V Output Voltage 1) Set the power supply at a voltage between 6V and 60V. Disable the power supply. Up to 4A Output Current 2) Connect the positive terminal of the power supply to 450kHz Switching Frequency the VIN PCB pad and the negative terminal to the Enable/UVLO Input, Resistor-Programmable UVLO nearest PGND PCB pad. Connect the positive terminal Threshold of the 4A load to the VOUT PCB pad and the negative Adjustable Soft-Start Time terminal to the nearest PGND PCB pad. MODE Pin to Select Among PWM, PFM, or DCM 3) Connect the DVM across the VOUT PCB pad and Modes the nearest PGND PCB pad. Open-Drain RESET Output 4) Verify that shunt is installed across pins 1-2 on jumper JU1 (see Table 1 for details). External Frequency Synchronization 5) Select the shunt position on JU2 according to the Overcurrent and Overtemperature Protection intended mode of operation (see Table 2 for details). Proven PCB Layout 6) Turn on the DC power supply. Fully Assembled and Tested 7) Enable the load. 8) Verify that the DVM displays 5V. Ordering Information appears at end of data sheet. 19-7691 Rev 2 4/18Evaluates: MAX17536 MAX17536EVKITB Evaluation Kit 5V Output-Voltage Application Mode/SYNC Selection (MODE) Detailed Description The devices MODE pin can be used to select among the The MAX17536 EV kit provides a proven design to evaluate PWM, PFM, or DCM modes of operation. The logic state the high-voltage, high-efficiency, synchronous step-down of the MODE pin is latched when the V and EN/UVLO DC-DC converter. The EV kit is preset for a 5V output from CC voltages exceed the respective UVLO rising thresholds a 6.5V to 60V input at load currents up to 4A and features and all internal voltages are ready to allow LX switching. a 450kHz switching frequency for optimum efficiency and State changes on the MODE pin are ignored during normal component size. operation. Refer to the MAX17536IC data sheet for more The EV kit includes an EN/UVLO PCB pad and JU1 to information on the PWM, PFM, and DCM modes of operation. enable the output at a desired input voltage. The SYNC Table 2 lists JU2 jumper settings that can be used to PCB pad allows an external clock to synchronize the configure the desired mode of operation. The internal device. JU2 allows the selection of a particular mode of oscillator of the device can be synchronized to an external operation based on light-load performance requirements. clock signal on the SYNC pin. The external synchronization An additional RESET PCB pad is available for monitoring clock frequency must be between 1.1f and 1.4f , when the converter output is in regulation. SW SW where f is the frequency of operation set by R5. The SW Soft-Start Input (SS) minimum external clock high pulse width should be greater The device utilizes an adjustable soft-start function to than 50ns, while the minimum external clock low pulse width limit inrush current during startup. The soft-start time is should be greater than 160ns. adjusted by the value of the external capacitor from SS to GND (C7). The selected output capacitance (C ) and SEL the output voltage (V ) determine the minimum value OUT Table 1. Regulator Enable (EN/UVLO) of C7, as shown by the following equation: Description (JU1) -6 C7 28 x 10 x C x V SEL OUT SHUNT MAX17536 EN/UVLO PIN The soft-start time (t ) is related to C7 by the following SS POSITION OUTPUT equation: 1-2* Connected to VIN Enabled -6 t = C7/(5.55 x 10 ) SS Enabled, UVLO Connected to the center level set through For example, to program a 2.2ms soft-start time, C7 Not installed node of resistor-divider the R1 and R2 should be 12nF. R1 and R2 resistors Regulator Enable/Undervoltage-Lockout Level 2-3 Connected to SGND Disabled (EN/UVLO) *Default position. The device offers an adjustable-input, undervoltage- lockout level. For normal operation, a shunt should be installed across pins 1-2 on JU1. To disable the output, Table 2. MODE Description (JU2) install a shunt across pins 2-3 on JU1 and the EN/UVLO SHUNT POSITION MODE PIN MAX17536 MODE pin is pulled to GND. See Table 1 for JU1 settings. PFM mode of Not installed* Unconnected Set the voltage at which the device turns on with the operation resistive voltage-divider R1/R2 connected from VIN to Connected to PWM mode of SGND. Connect the center node of the divider to EN/ 1-2 SGND operation UVLO. Choose R1 to be 3.32M and then calculate R2 Connected to DCM mode of as follows: 2-3 VCC operation R1 x 1.215 R2 = *Default position. VINU - 1.215 where VINU is the voltage at which the device is required to turn on. Maxim Integrated 2 www.maximintegrated.com