Copyright © 2006 Active-Semi, Inc.

www.active-semi.com

- 1 -

Including Low ESR Ceramic Capacitors

The ACT4070 is a current-mode step-down

DC/DC converter that generates up to 3A output

current at 400kHz switching frequency. The

device

utilizes

Active-Semi’s

proprietary

ISOBCD30 process for operation with input

voltage up to 30V.

Consuming only 6

μA in shutdown mode, the

ACT4070 is highly efficient with peak efficiency at

95% when in operation. Protection features

include

cycle-by-cycle

current

limit,

thermal

shutdown, and frequency fold back at short circuit.

The device also includes an internal soft start

function to prevent overshoot.

The ACT4070 is available in SOP-8/EP exposed

pad package and requires very few external

devices for operation.

GENERAL DESCRIPTION

TYPICAL APPLICATION CIRCUIT

FEATURES

APPLICATIONS

ACT4070

Rev 0, 12/2006

Wide Input 3A Step Down Converter