Innovative Power

TM

- 1 -

www.active-semi.com

Copyright © 2008 Active-Semi, Inc.

FEATURES

Including Low ESR Ceramic Capacitors

APPLICATIONS

GENERAL DESCRIPTION

The ACT4012A is a current-mode step-down

DC/DC converter that generates up to 1.5A output

420kHz switching frequency. The device utilizes

Active-Semi’s proprietary ISOBCD20 process for

operation with input voltages up to 20V.

Consuming only 10µA in shutdown mode, the

ACT4012A is highly efficient with peak efficiency at

94% when in operation. Protection features include

cycle-by-cycle current limit, thermal shutdown, and

frequency foldback at short circuit.

The ACT4012A is available in a SOP-8 package

and requires very few external devices for opera-

tion.

TYPICAL APPLICATION CIRCUIT

ACT4012A

Rev0, 16-May-08

Wide Input 1.5A Step Down Converter

ACT4012A

BS

IN

EN

COMP

FB

SW

G

ENABLE

12V

+

5V/1.5A