MAX77597EVKIT# Analog Devices

Click here to ask about the production status of specific part numbers. Evaluates: MAX77597 MAX77597 Evaluation Kit General Description Features The MAX77597 evaluation kit (EV kit) demonstrates the Evaluates Both Fixed-Output and Adjustable-Output MAX77597 synchronous step-down converter IC with Versions (3.3V Version Is Preinstalled) integrated switches. The EV kit operates over a wide 3.5V to 36V Input Voltage Range input range of 3.5V to 36V and can support loads up to 300mA Maximum Load 300mA. The EV kit comes standard with the 3.3V fixed Demonstrates 1.1A Quiescent Current at 14V Input output voltage version of the IC. It can be easily modified to evaluate the 5V fixed output version or the adjustable RESET Output Test Point output voltage version. Simple Two-Layer Board Serves as a Reference The EV kit includes jumpers to enable or disable the Design device, as well as to select either forced-PWM mode Proven PCB Layout (FPWM) or skip-mode operation. A RESETB test point is Fully Assembled and Tested available to monitor the voltage quality of the converters output. Ordering Information appears at end of data sheet. MAX77597 EV Kit birds eye view 319-100607 Rev 0 10/20Evaluates: MAX77597 MAX77597 Evaluation Kit Quick Start Detailed Description of Hardware The MAX77597 EV kit is a fully assembled and tested Required Equipment circuit board to evaluate the performance of the MAX77597 MAX77597 EV kit step-down converter IC. The EV kit operates over a 3.5V DC power supply capable of supplying 36V, 300mA to 36V input voltage range, while consuming only 1.1A of quiescent current at 14V and 0mA load (fixed-output Variable load capable of sinking 300mA at 3.3V IN DC voltage version). Two voltmeters The EV kit can be configured to operate in forced-PWM Procedure mode (FPWM) or low-quiescent current skip mode using The EV kit is fully assembled and tested. Follow the steps jumper J2. The IC can be enabled or disabled using jump- below to verify board operation. Read all the steps before er J1. The RESETB test point connects to the ICs RESET proceeding with step 1. output, which monitors output-voltage quality. Refer to the MAX77597 IC data sheet for more information on the IC. 1) Verify that the IC is enabled by installing a shunt on pins 1-2 on jumper J1. Configuring the Output Voltage (V ) OUT 2) Verify that IC is operating in skip mode by installing a The EV kit comes standard with the fixed 3.3V output shunt on pins 2-3 on jumper J2. version, but can easily be modified to evaluate the 3) Set the DC power supply to 0V. adjustable-output version of the device or the 5V fixed version. 4) Set the variable load to 0mA. To evaluate the 5V fixed output voltage version, replace 5) Connect the positive and negative terminals of U1 with the MAX77597ETBA+ and leave the rest of the the power supply to the VIN and GND1 test pads, board unchanged. respectively. To evaluate the adjustable-output voltage version, replace 6) Connect terminals of the variable load to the VOUT U1 with the MAX77597ETBC+ and remove the 0 and GND2 test pads. Observe the positive and resistor on R4. The output voltage of the adjustable negative polarity requirements of the variable load, version can be set between 1V and 10V by populating if there are any (VOUT is positive and GND2 is resistors R3 and R4. Choose R3 to be less than or equal negative). to 100k. Then calculate R4 for the desired V with OUT 7) Attach a voltmeter across the VOUT and GND2 test the following equation: pads. R4 = R3 x (V /V ) - 1 OUT FB 8) Attach a voltmeter across the RESETB and GND2 where V = 1V. test pads. FB The feed-forward capacitor (C8) is already installed 9) Ramp the DC power-supply voltage from 0 to 12V. for use with the external feedback resistors and the 10) Verify that the voltmeter connected to VOUT adjustable version of the IC. C8 is not required for the measures approximately 3.3V. fixed-output-voltage version. When evaluating other 11) Verify that the voltmeter connected to RESETB versions of the device, the inductor, input capacitors, and measures approximately 5V. output capacitors might need to change. Refer to the Applications Information section in the MAX77597 IC data 12) Enable the variable load and ramp the load current sheet for more information. from 0mA to 300mA. 13) Repeat steps 10 and 11. Maxim Integrated 2 www.maximintegrated.com