Evaluates: MAX20743 MAX20743 Evaluation Kit General Description Quick Start The MAX20743 Evaluation Kit (EV kit) serves as a Required Equipment reference platform for evaluating the MAX20743 voltage MAX20743 EV kit regulator IC. This single-chip, integrated switching regulator 4.5V to 16V power supply provides an extremely compact, low-cost, highly efficient, fast, accurate, and reliable power-delivery solution for 0A to 35A Load emerging low output-voltage applications up to 35A. Refer Oscilloscope, probes, voltmeter to the MAX20743 IC data sheet for more information. Optional Equipment The EV kit consists of a fully assembled and tested PCB MAXPOWERTOOL002 USB-to-PMBus interface implementation of the MAX20743. Jumper pins, test dongle points, and input/output connectors are included for flex - ibility and ease of use in a wide range of applications. Maxim PowerTool software The evaluation board is configured with an edge strip to Procedure allow high di/dt loading when evaluating the system. The The EV kit is fully assembled and tested. Follow the steps +V connection is on the top side, while the return (or OUT below to verify board operation: -V ) is on the bottom side, directly mirroring the top- OUT side strip. 1) Connect a powered-off 4.5V to 16V input supply to J1. Optionally, connect supply sense leads to V DD1 Either solder directly to the output strip or use the J8 and GND1 for best accuracy. terminal block to interface to a load. 2) Connect load to J3 or J8. 3) If Maxim PowerTool software is used, connect the Features MAXPOWERTOOL002 USB-to-PMBus interface High Efficiency and Power Density dongle to J704 and to the USB port on your PC. Low Component Count 4) Connect V scope probe/voltmeter to J4 or J11, OUT if desired. Small Solution Size J4 and J11 are connected to the sense point for 2 509mm Including Inductor and Output Capacitors best accuracy. Optimized Performance 5) Position the SW1 toggle switch, pointing away from Reduced Design-In Time J1 to enable the IC (if desired). Interfaces to Maxim PMBus Dongle and 6) Turn on the power supply set to 12V and observe that V = 1V. PowerTool GUI OUT 7) For efficiency measurements, J6 has the appropriate Proven PCB Layout Kelvin sense points. Fully Assembled and Tested Ordering Information appears at end of data sheet. PMBus is a trademark of SMIF, Inc. PowerTool is a trademark of Maxim Integrated Products, Inc. 19-7764 Rev 0 7/16Evaluates: MAX20743 MAX20743 Evaluation Kit Status Monitoring Operation Whenever the part is actively regulating, and the output The MAX20743 IC is a monolithic, high-frequency step- voltage is within the power-good window, the STAT pin down switching regulator optimized for applications is high. In all other conditions, including enabled but in requiring small size, high efficiency and low output- a fault state, the STAT pin is pulled low. Refer to the voltages. Detailed product and application information is MAX20743 IC data sheet for more details. provided in the MAX20743 IC data sheet. Input-Voltage Monitoring Output Enable (OE) The V and GND1 sense points monitor the input OE is used to enable/disable the output voltage. The DD1 supply. output voltage is enabled/disabled by SW1. Pointing SW1 in the direction of the silkscreened arrow enables the Switching-Voltage Monitoring regulator. The switching waveform can be monitored on VX1. Output-Voltage Selection Output-Voltage Monitoring The MAX20743 EV kit is set up to initially boot up to an J4-1 and J4-2 monitor the output voltage of V and OUT output voltage of 1V. This has been accomplished by GND, respectively. These test points should not be used setting the reference to come up to a V of 0.65V BOOT for loading. Alternatively, scope jack J11 can be used to and placing a voltage-divider in the feedback path with a monitor the output voltage. divide ratio of 0.65. The reference voltage can be changed through PMBus, in which case the output voltage follows Efficiency Testing the reference voltage divided by the 0.65 divide ratio. To J6 provides convenient access to the appropriate V and IN achieve higher output voltages, a higher divide ratio can V sense points. OUT be used. Note that the PMBus commanded and reported VIN EFF are on J6 pins 1-2. V is actually the voltage at the sense pins, so with the OUT feedback divider in place, the divide ratio must be taken VOUT EFF are on J6 pins 3-4. into account. Input and output currents should be measured with R and C can also be changed to affect perfor- GAIN OUT 0.1% lab shunts. mance. Refer to the MAX20743 IC data sheet for more For increased accuracy, shunt mismatch can be details. measured and calibrated out by doing a test, running the same current through both shunts. Soft-Start and Switching Frequency These are programmable parameters. For the EV kit, soft start is set to 3ms and switching frequency is set to Ordering Information 400kHz. PART TYPE MAX20743EVKIT EV Kit Denotes RoHS compliant. Maxim Integrated 2 www.maximintegrated.com