Evaluates: MAX20745 MAX20745 Evaluation Kit General Description Getting Started The MAX20745 Evaluation Kit (EV kit) serves as a Required Equipment reference platform for evaluating the MAX20745 MAX20745 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 25A Load solution for emerging low-output voltage applications up Oscillocope, probes, voltmeter to 25A. Refer to the MAX20745 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 MAX20745. Jumper pins, test points, and input/output connectors are included for 1) Connect a 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 MAX20745 (if desired). 5) Turn on the power supply set to 12V and observe that Features V = 1V. OUT 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. 19-7763 Rev 0 10/15Evaluates: MAX20745 MAX20745 Evaluation Kit Input-Voltage Monitoring Operation The MAX20745 IC is a monolithic, high-frequency step- The V and GND1 sense points monitor the input DD1 down switching regulator optimized for applications supply. requiring small-size, high-efficiency, and low-output volt- Switching-Voltage Monitoring ages. Detailed product and application information is The switching waveform can be monitored on VX1. provided in the MAX20745 IC data sheet. Output-Voltage Monitoring Output Enable (OE) J4-1 and J4-2 monitor the output voltage of V and OE is used to enable/disable the output voltage. The OUT GND, respectively. These test points should not be used output voltage is enabled/disabled by SW1. Pointing SW1 for loading. Alternatively, scopejack J11 can be used to in the direction of the silkscreened arrow enables the monitor the output voltage. regulator. Efficiency Testing Output-Voltage Selection J6 provides convenient access to the appropriate V and The EV kit is setup to initially boot up to an output IN V sense points. voltage of 1V. This has been accomplished by setting OUT the reference to come up to a V of 0.65V and BOOT VIN EFF are on J6 pins 1-2. placing a voltage-divider in the feedback path with a VOUT EFF are on J6 pins 3-4. divide ratio of 0.65. For different V values, the V OUT BOOT Input and output currents should be measured with and feedback-divider ratio can be changed, as described 0.1% lab shunts. in the MAX20745 IC data sheet. For increased accuracy, shunt mismatch can be R and C can also be changed to affect GAIN OUT measured and calibrated out by doing a test running performance. Refer to the MAX20745 IC data sheet for the same current through both shunts. more details. 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 400kHz. Status Monitoring Ordering Information Whenever the part is actively regulating, and the output voltage is within the power-good window, the STAT pin PART TYPE is high. In all other conditions, including enabled but in MAX20745EVKIT EV Kit a fault state, the STAT pin is pulled low. Refer to the Denotes RoHS compliant. MAX20745 IC data sheet for more details. Maxim Integrated 2 www.maximintegrated.com