A7431MP8VR datasheet(13/15 Pages) AITSEMI

13 / 15 page

AiT Semiconductor Inc.

www.ait-ic.com

A7431

DC-DC CONVERTER BUCK (STEP-DOWN)

42V 3A CC/CV

REV1.1

- JAN 2016 RELEASED, SEP 2016 UPDATED -

- 13 -

PC Board Layout Guidance

Figure8 showed the example of components placement and PCB layout. When laying out the printed circuit

board, the following checklist should be used to ensure proper operation of the IC.

1) Arrange the power components to reduce the AC loop size，consisting of input ceramic capacitor C1, VIN

pin, SW pin and the schottky diode D1.

2) Place input decoupling ceramic capacitor C1 as close to VIN pin as possible. C1 is connected power GND

with vias or short and wide path.

3) Return FB, COMP and ISET to signal GND pin, and connect the signal GND to power GND at a single

point for best noise immunity. Connect exposed pad to power ground copper area with copper and vias.

4) Use copper plane for power GND for best heat dissipation and noise immunity.

5) Place feedback resistor close to FB pin.

6) Use short trace connecting BS-C5-SW loop.

Figure 8: Example of PCB Layout

Figure 9. Typical Efficiency Curve

A7431MP8VR Datasheet(PDF) 13 Page - AiT Semiconductor Inc.