MAX20098EVKIT# Analog Devices

Click here for production status of specific part numbers. Evaluates: MAX20098 MAX20098 Evaluation Kit General Description Quick Start The MAX20098 evaluation kit (EV kit) provides a proven Required Equipment design to evaluate the MAX20098 automotive 2.2MHz MAX20098 EV kit synchronous step-down controller with 3.5A I . The EV Q 3.5V to 36V, 7A power supply (capable of providing kit PCB comes with a MAX20098ATEA/VY+ installed, as 7A at 3.5V input) well as various test points and jumpers for evaluation. The EV kit output voltage is fixed and is easily configured with Digital multimeter (DMM) minimum component changes. The EV kit is designed to Oscilloscope deliver up to 7A with input voltages from 3.5V to 36V and Electronic load capable of sinking 7A by switching at 400kHz/2.2MHz, but can be configured to deliver up to 20A. Output-voltage quality can be moni- Procedure tored by observing the PGOOD signal. The EV kit is fully assembled and tested. Follow the steps below to verify board operation: Benefits and Features 1) Verify that all jumpers are in their default positions, as 3.5V to 36V Input Supply Range shown in Table 1. Output Voltage: 5V or 3.3V Fixed, or Adjustable 2) Connect the positive and negative terminals of from 1V up to 10V the power supply to the SUP and GND1 test pads, Delivers up to 20A Output Current respectively. Frequency-Synchronization Input 3) Set the power-supply voltage to 14V and current limit Enable Input to 3A. Voltage-Monitoring PGOOD Output 4) Turn on the power supply. Proven PCB Layout 5) Verify that OUT is approximately 5V using the DMM. Fully Assembled and Tested 6) Verify that the switching frequency is approximately 2.2MHz by monitoring inductor switching voltage with the oscilloscope. Additional Evaluation 7) Connect the positive and negative terminals of the Ordering Information appears at end of data sheet. electronic load to OUT and GND, respectively. 8) Set the electronic load to the desired current at or below 7A, or use an equivalent resistive load with an appropriate power rating. 9) Adjust current limit on the power supply as necessary. 10) Turn on the power supply and electronic load. 11) Verify that voltage across the VOUT and GND PCB pads is 5V 1%. 319-100056 Rev 4 4/19MAX20098 Evaluation Kit Evaluates: MAX20098 Table 1. Default Jumper Settings BST Diode The BST diode (D1) can be removed if operating in skip DEFAULT SHUNT JUMPER FUNCTIONS mode or at low switching frequency, 400kHz. Skip mode POSITION is set with a shunt position of 2-3 on the SYNC jumper. ENABLE 1-2 Buck enabled Evaluating the MAX20098 SYNC 1-2 Forced-PWM mode The IC is available in fixed 5V and 3.3V outputs. The EV kit comes installed with the 5V output version. To Detailed Description of Hardware externally configure the output voltage, remove R1 and The MAX20098 EV kit provides a proven layout for place appropriate resistors in positions R17 and R19. To the MAX20098 synchronous buck regulator IC. The IC optimize efficiency, refer to the MAX20098 IC data sheet. accepts input voltages as high as 36V and delivers up to 20A. The EV kit can handle an input supply transient up to Evaluate 400kHz or 2.2MHz Operation 42V. Various test points are included for evaluation. Order the MAX20098EVKIT to evaluate 2.2MHz opera- tion. Order the MAX20098LFEVKIT to evaluate 400kHz External Synchronization operation. Table 2 lists different component selections for The IC can operate in two modes: forced-PWM (FPWM) both 2.2MHz and 400kHz switching frequencies (the other or skip mode. Skip mode has better efficiency for light-load components remain the same). conditions. When SYNC is pulled low, the IC operates in skip mode for light loads and PWM mode for larger loads. When SYNC is pulled high, the IC is forced to operate in Ordering Information PWM mode across all load conditions. SYNC can be used PART TYPE f SW to synchronize with other supplies if a clock source is MAX20098EVKIT EV Kit 2.2MHz present. The IC is forced to operate in FPWM mode when MAX20098LFEVKIT EV Kit 400kHz SYNC is connected to a clock source. Denotes RoHS compliant. Buck Output Monitoring (PGOOD) The EV kit provides a power-good output test point (PGOOD) to monitor the status of the buck output (OUT). PGOOD is low impedance when the output voltage is in regulation. PGOOD is high impedance when the output voltage drops below 7% (typ) of its nominal regulated voltage. Maxim Integrated 2 www.maximintegrated.com