Evaluates: MAX15462C in MAX15462C 12V Evaluation Kit 12V Output Voltage Application General Description Quick Start The MAX15462C 12V evaluation kit (EV kit) is a fully Recommended Equipment assembled and tested circuit board that demonstrates the MAX15462C 12V EV kit performance of the MAX15462C 42V, 300mA ultra-small, 42V adjustable, 0.5A DC power supply high-efficiency, synchronous step-down converter. The EV kit operates over a wide input voltage range of 14V Electronic load up to 300mA to 42V, and provides up to 300mA load current at 12V Voltmeter output voltage. The device features undervoltage lockout, overcurrent protection, and thermal shutdown. The EV kit Procedure switches at a frequency of 500kHz, and delivers a peak The EV kit is fully assembled and tested. Follow the steps efficiency of 95% with the supplied components. below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. The EV kit comes installed with the MAX15462CATA+ in an 8-pin (2mm x 2mm) lead(Pb)-free/RoHS-compliant 1) Verify that shunts are installed on jumpers JU1, JU2 TDFN package. (EN/UVLO). 2) Verify that jumper JU3 (MODE-PFM operation) is Features and Benefits open. 14V to 42V Input Voltage Range 3) Set the electronic load to constant-current mode, 12V Output, 300mA Continuous Current 300mA, and disable the electronic load. Internal Compensation 4) Connect the electronic loads positive terminal to the VOUT PCB pad. Connect the negative terminal to the EN/UVLO for On/Off Control and Programmable GND PCB pad. Input Undervoltage Lockout 5) Connect the voltmeter across the VOUT and GND 95% Peak Efficiency PCB pads. 500kHz Switching Frequency 6) Set the power-supply output to 24V. Disable the PFM or Forced-PWM Mode of Operation power supply. Hiccup Mode Overcurrent Protection 7) Connect the 24V power-supply output to the VIN PCB Open-Drain RESET Output pad. Connect the supply ground to the GND PCB pad. Thermal Shutdown 8) Turn on the power supply. Lead-Free, 8-Pin, 2mm x 2mm TDFN Package 9) Enable the electronic load and verify that output voltage is at 12V with respect to GND. Proven PCB Layout 10) Vary the input voltage from 14V to 42V. Fully Assembled and Tested 11) Vary the load current from 1mA to 300mA and verify Ordering Information appears at end of data sheet. that output voltage is 12V. 19-7563 Rev 0 3/15Evaluates: MAX15462C in MAX15462C 12V Evaluation Kit 12V Output Voltage Application undervoltage-lockout (UVLO) threshold. Jumpers JU1 Detailed Description and JU2 configure the EV kits output for turn-on/turn-off The MAX15462C 12V EV kit is a fully assembled and control. Install a shunt across jumper JU2 pins 1-2 to tested circuit board that demonstrates the performance of disable VOUT. See Table 1 for proper JU1, JU2 jumper the MAX15462C 42V, 300mA ultra-small, high-efficiency, configurations. synchronous step-down converter. The EV kit operates Additionally, resistors R1 and R2 are included to set the over a wide input voltage range of 14V to 42V, and UVLO to a desired turn-on voltage. Refer to the Enable provides up to 300mA load current at 12V output voltage. Input (EN/UVLO), Soft-Start section in the MAX15462 IC The device features undervoltage lockout, overcurrent data sheet for additional information on setting the UVLO protection, and thermal shutdown. The EV kit switches at threshold voltage. a frequency of 500kHz, and delivers a peak efficiency of 95% with the supplied components. Active-Low, Open-Drain Reset Output The EV kit includes an EN/UVLO PCB pad and jumpers (RESET) JU1, JU2 to enable control of the converter output. The The EV kit provides a PCB pad to monitor the status of MODE PCB pad and jumper JU3 are provided for select- the RESET output. RESET goes high when V rises OUT ing the mode of operation of the converter. The VCC above 95% (typ) of its nominal regulated output voltage. PCB pad helps measure the internal LDO voltage. An RESET goes low when V falls below 92% (typ) of its OUT additional RESET PCB pad is available for monitoring the nominal regulated voltage. open-drain logic output. The EV kit output voltage can be configured to 15V by PFM or Forced-PWM Mode (MODE) installing the resistor R6 and the inductor L1 (alternate) The EV kit includes a jumper (JU3) to program the included in the EV kit. mode of operation of the converter. Install a shunt across JU3 before powering up the EV kit to enable the forced- Enable Control (JU1, JU2) PWM operation. Keep JU3 open to enable the light-load The EN/UVLO pin on the device serves as an on/off PFM operation. See Table 2 for proper JU3 jumper control while also allowing the user to program the input configurations. Table 1. Enable Control (EN/UVLO) (JU1, JU2) SHUNT POSITION EN/UVLO PIN VOUT OUTPUT JU1 JU2 1-2 Open Connected to VIN Enabled Open 1-2 Connected to GND Disabled 1-2* 1-2* Connected to midpoint of R1, R2 resistor-divider Enabled at VIN 13V *Default position. Table 2. MODE Control SHUNT POSITION MODE PIN MODE OF OPERATION 1-2 Connected to GND Forced PWM Open* Unconnected PFM *Default position. Maxim Integrated 2 www.maximintegrated.com