Evaluates: MAX20734 MAX20734 Evaluation Kit General Description Quick Start The MAX20734 Evaluation Kit (EV kit) serves as a Required Equipment reference platform for evaluating the MAX20734 volt- MAX20734 EV kit age regulator IC. This single-chip, integrated switching 4.5V to 16V power supply regulator provides an extremely compact, low cost, highly efficient, fast, accurate and reliable power delivery 0A to 40A load solution for emerging low-output voltage applications up Oscilloscope, probes, voltmeter to 40A. Refer to the MAX20734 IC data sheet for more information. Optional Equipment MAXPOWERTOOL002 USB-to-PMBus interface The EV kit comprises a fully-assembled and tested PCB implementation of the MAX20734. Jumper pins, test dongle points, and input/output connectors are included for flex - Maxim PowerTool software ibility and ease-of-use in a wide range of applications. Procedure The evaluation board is configured with an edge strip to The EV kit is fully assembled and tested. Verfiy board allow high di/dt loading when evaluating the system. The operation using these steps: +V connection is on the top side, while the return (or OUT -V ) is on the bottom side, directly mirroring the top- 1) Connect a powered-off 4.5V to 16V input supply OUT side strip. 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 the 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 the PC. Low Component Count 4) Connect the V scope probe/voltmeter to J4 or OUT J11, as desired. Small Solution Size 2 J4 and J11 are connected to the sense point for 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). 6) Turn on the input supply and observe that Interfaces to Maxim PMBus Dongle and PowerTool GUI V = 1V. 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. 19-8621 Rev 0 8/16Evaluates: MAX20734 MAX20734 Evaluation Kit Status Monitoring Operation The MAX20734 IC is a monolithic, high-frequency step- Whenever the part is actively regulating, and the output down switching regulator optimized for applications volt age is within the power-good window, the STAT pin requiring small size, high efficiency, and low output volt- is high. In all other conditions, including enabled but in ages. Detailed product and application information is a fault state, the STAT pin is pulled low. Refer to the provided in the MAX20734 IC data sheet. MAX20734 IC data sheet for more details. 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 MAX20734 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 0.6484V BOOT for loading. Alternatively, scopejack J11 can be used to and placing a voltage-divider in the feedback path with monitor the output voltage. a divide ratio of 0.6484. The reference voltage can be Efficiency Testing changed through PMBus, in which case the output volt- J6 provides convenient access to the appropriate V and age follows the reference voltage divided by the 0.6484 IN divide ratio. To achieve higher output voltages, a higher V sense points. OUT divide ratio can be used. Note that the PMBus command- VIN EFF are on J6 pins 1 and 2. ed and reported V is actually the voltage at the sense OUT VOUT EFF are on J6 pins 3 and 4. pins, so with the feedback-divider in place, the divide ratio Input and output currents should be measured with must be taken into account. 0.1% lab shunts. R and C can also be changed to affect GAIN OUT For increased accuracy, shunt mismatch can be per formance. Refer to the MAX20734 IC data sheet for measured and calibrated out by doing a test running more details. the same current through both shunts. Soft-Start and Switching Frequency These are programmable parameters. For the EV kit, Ordering Information soft-start is set to 3ms and switching frequency is set to DEVICE TYPE TYPE 400kHz. MAX20734EVKIT EV Kit Denotes RoHS compliant. Maxim Integrated 2 www.maximintegrated.com