Click here for production status of specific part numbers. MAX20408/MAX20410 Evaluate: MAX20408/MAX20410 Evaluation Kits General Description Quick Start The MAX20408/MAX20410 evaluation kits (EV kits) Required Equipment provide a proven design to evaluate the MAX20408/ MAX20408/MAX20410 EV kit MAX20410 automotive synchronous buck converter 36V, 10A DC power supply (PS) with 10A quiescent current. The EV kit comes with a MAX20410AFOB/VY+(400kHz) or MAX20408AFOE/VY+ Appropriate resistive load, or an electronic load that (2.1MHz) installed, as well as various test points and can sink 10A jumpers for evaluation. The EV kit output voltage is fixed Digital multimeter (DMM) 3.3V or 4V and easily configured to 0.8V to 10V with mini- Oscilloscope mum component changes. The EV kit is designed to deliver up to 8A/10A with input Procedure voltage 3V to 36V. The output voltage quality can be The EV kit is fully assembled and tested. Use the follow- monitored by observing the PGOOD signal. ing steps to verify board operation: Features 1) Verify that all jumpers are in their default positions, as shown in Table 1. Input Supply Range from 3V to 36V 2) Connect the positive and negative terminals of the Output Voltage: 3.3V/4V Fixed and Adjustable from power supply to the VSUP and GND test pads, 0.8V to 10V respectively. Delivers Up to 8A/10A 3) Set the power-supply voltage to 14V. 4) Turn on the power supply. Frequency-Synchronization Input 5) Using the DMM, verify the OUT is approximately Enable Input 3.3V on MAX20410EVKIT or 4V on MAX- Spread Spectrum Available 20408EVKIT . 6) Verify that the switching frequency is approximately Voltage Monitoring PGOOD Output Available either 2.1MHz on MAX20408EVKIT or 400kHz Proven PCB Layout on MAX20410EVKIT by monitoring the inductor Fully Assembled and Tested switching voltage with the oscilloscope. 7) Turn off the power supply. Additional Evaluation 8) Connect the positive and negative terminals of the electronic load to VOUT and GND2, respectively. 9) Set the electronic load to the desired current at or Ordering Information appears at end of data sheet. below 10A or use an equivalent resistive load with an appropriate power rating. 10) Adjust current limit on the power supply as necessary. 11) Turn on the power supply and electronic load. 12) Verify that voltage across the VOUT and GND2 PCB pads is 3.3V 2% on MAX20410EVKIT or 4V 2% on MAX20408EVKIT . 319-100580 Rev 4 7/21MAX20408/MAX20410 Evaluate: MAX20408/MAX20410 Evaluation Kits Buck Output Monitoring (PGOOD) Detailed Description of Hardware The EV kit provides a power-good output test point The MAX20408/MAX20410 EV kits provide a proven (PGOOD) to monitor the status of the buck output (OUT). layout for the MAX20408/MAX20410 synchronous buck PGOOD is pulled to high when the output is on regulation. regulator IC. The IC accepts input voltages as high as It is pulled to ground when the output voltage drops below 36V and delivers up to 10A. The EV kit can handle an 7% (typ) of its nominal regulated voltage. input supply transient up to 42V. Various test points are included for evaluation. Programming Buck Output Voltage External Synchronization The EV kit comes installed with MAX20410AFOB/VY+ or MAX20408AFOE/VY+(2.1MHz), which provides an The IC can operate in two modes: forced-PWM (FPWM) adjustable 0.8V to 10V output voltage. To program VOUT or skip mode. Skip mode has better efficiency for light voltage, removing R5 and place appropriate resistors in load conditions. When SYNC is pulled low, the IC oper- the positions R7 and R8 according to the following equa- ates in skip mode for light loads and PWM mode for larger tion: loads. When SYNC is pulled high, the IC is forced to operate in PWM mode across all load conditions. SYNC Equation 1: can be used to synchronize with external clock if a clock R7 = R8 x (VOUT/VFB) - 1 source is present. The IC is forced to operate in FPWM mode when SYNC is connected to a clock source. Where typically VFB = 0.8V and R8 = 10k. Refer to the IC data sheet for C16 value. Table 1. Default Jumper Settings Evaluating Other Variants DEFAULT SHUNT JUMPER FUNCTIONS The EV kit comes installed with either the 4V/2.1MHz, 8A POSITION variant (MAX20408AFOE/VY+ (2.1MHz)) or 3.3V/400kHz, ENABLE 1-2 Buck enabled 10A variant (MAX20410AFOB/VY+). The other variants J1 1-2 Forced-PWM mode can be installed with minimal component changes. J2 Installed PGOOD pulled up to bias To use the 2.1MHz devices on the MAX20410EVKIT , change inductor L2 to 0.47H and output capacitors C12, C13, C14, and C15 needs to change to 22F. Ordering Information V OUT PART TYPE MAX20408/ MAX20408EVKIT 4V/2.1MHz EV Kit R FB1 MAX20410 C FB1 MAX20410EVKIT 3.3V/400kHz EV Kit FB Denotes RoHS compliance. R FB2 Figure 1. MAX20408 EV Kit Adjustable Output Voltage Setting Maxim Integrated 2 www.maximintegrated.com