A7431
DC-DC CONVERTER BUCK (STEP-DOWN)
42V 3A CC/CV
AiT Semiconductor Inc.
www.ait-ic.com
PIN DESCRIPTION
Top View
Pin #
1
Symbol
BS
Function
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.
Power Supply Input. Bypass this pin with a minimum 10μF ceramic capacitor to GND,
placed as close to the IC as possible.
2
3
VIN
SW
Power Switching Output to External Inductor.
Ground. Connect this pin to a large PCB copper area for best heat dissipation. Return
FB, COMP, and ISET to this GND, and connect this GND to power GND at a single
point for best noise immunity.
4
GND
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.
Error Amplifier Output. This pin is used to compensate the converter.
OVP input. If the voltage at this pin exceeds 0.8V, the IC shuts down high-side switch.
Output Current Setting Pin. Connect a resistor from ISET to GND to program the output
current.
5
FB
6
7
COMP
OVP
8
9
ISET
Exposed Heat Dissipation Pad. Connect this exposed pad to large ground copper area with
Pad copper and vias.
REV1.1
- JAN 2016 RELEASED, SEP 2016 UPDATED -
- 2 -
AITSEMI [ AiT Semiconductor ]
