Evaluates: MAX20735 MAX20735 Evaluation Kit General Description Getting Started The MAX20735 Evaluation Kit (EV kit) serves as a Required Equipment reference platform for evaluating the MAX20735 MAX20735 EV kit voltage regulator IC. This single-chip, integrated switching 4.5V to 16V power supply regulator provides an extremely compact, low-cost, high- ly efficient, fast, accurate and reliable power delivery 0A to 40A Load solution for emerging low-output voltage applications up Oscillocope, probes, voltmeter to 40A. Refer to the MAX20735 IC data sheet for more information. Procedure The EV kit is fully assembled and tested. Follow the steps The EV kit consists of a fully assembled and tested below to verify board operation: PCB implementation of the MAX20735. Jumper pins, test points, and input/output connectors are included for 1) Connect a powered-off 4.5V to 16V input supply to J1. flexibility and ease-of-use in a wide range of applications. Optionally, connect supply sense leads to V DD1 and GND1 for best accuracy. The evaluation board is configured with an edge strip to 2) Connect the load to J3 or J8. allow high di/dt loading when evaluating the system. The 3) Connect the V scope probe/voltmeter to J4 or +V connection is on the top side, while the return (or OUT OUT J11, as desired. -V ) is on the bottom side, directly mirroring the top- OUT J4 and J11 are connected to the sense point for side strip. best accuracy. Either solder directly to the output strip or use the J8 4) Position the SW1 toggle switch, pointing away from terminal block to interface to a load. J1 to enable the IC (if desired). 5) Turn on the power supply and observe that V = OUT Features 1V. High Efficiency and Power Density 6) For efficiency measurements, J6 has appropriate Low Component Count Kelvin sense points. Small Solution Size 2 509mm Including Inductor and Output Capacitors Optimized Performance Reduced Design-In Time Proven PCB Layout Fully Assembled and Tested Ordering Information appears at end of data sheet. 19-8622 Rev 0 8/16Evaluates: MAX20735 MAX20735 Evaluation Kit Input-Voltage Monitoring Operation The V and GND1 sense points monitor the input supply. The MAX20735 IC is a monolithic, high-frequency step- DD1 down switching regulator optimized for applications Switching-Voltage Monitoring requiring small-size, high-efficiency, and low-output volt- The switching waveform can be monitored on VX1. ages. Detailed product and application information is provided in the MAX20735 IC data sheet. Output-Voltage Monitoring J4-1 and J4-2 monitor the output voltage of V and Output Enable (OE) OUT GND, respectively. These test points should not be used OE is used to enable/disable the output voltage. The for loading. Alternatively, scopejack J11 can be used to output voltage is enabled/disabled by SW1. Pointing SW1 monitor the output voltage. in the direction of the silkscreened arrow enables the regulator. Efficiency Testing Output-Voltage Selection J6 provides convenient access to the appropriate V and V sense points. IN OUT The EV kit is setup to initially boot up to an output voltage of 1V. This has been accomplished by setting VIN EFF are on J6 pins 1 and 2. the reference to come up to a V of 0.6484V and BOOT VOUT EFF are on J6 pins 3 and 4. placing a voltage-divider in the feedback path with a Input and output currents should be measured with divide ratio of 0.6484. For different V values, the OUT 0.1% lab shunts. V and feedback-divider ratio can be changed, as BOOT For increased accuracy, shunt mismatch can be described in the MAX20735 IC data sheet. measured and calibrated out by doing a test running R and C can also be changed to affect GAIN OUT the same current through both shunts. performance. Refer to the MAX20735 IC data sheet for For increased accuracy, shunt mismatch can be more details. measured and calibrated out by doing a test running Soft-Start and Switching Frequency the same current through both shunts. These are programmable parameters. For the EV kit, soft- start is set to 3ms, and switching frequency to 400kHz. Status Monitoring Whenever the part is actively regulating, and the output Ordering Information voltage is within the power-good window, the STAT pin DEVICE TYPE TYPE is high. In all other conditions, including enabled but in MAX20735EVKIT EV Kit a fault state, the STAT pin is pulled low. Refer to the Denotes RoHS compliant. MAX20735 IC data sheet for more details. Maxim Integrated 2 www.maximintegrated.com