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 -

- 2 -

PIN DESCRIPTION

Top View

Pin #

Symbol

Function

1

BS

High Side Bias Pin. This provides power to the internal high-side MOSFET gate driver.

Connect a 22nF capacitor from BS pin to SW pin.

2

Power Supply Input. Bypass this pin with a minimum 10μF ceramic capacitor to GND,

placed as close to the IC as possible.

3

SW

Power Switching Output to External Inductor.

4

GND

Ground. Connect this pin to a large PCB copper area for best heat dissipation. Return

point for best noise immunity.

5

FB

Feedback Input. The voltage at this pin is regulated to 0.808V.

Connect to the resistor divider between output and GND to set the output voltage.

6

COMP

Error Amplifier Output. This pin is used to compensate the converter.

7

OVP

OVP input. If the voltage at this pin exceeds 0.8V, the IC shuts down high-side switch.

8

current.

9

Exposed

Pad

Heat Dissipation Pad. Connect this exposed pad to large ground copper area with

copper and vias.