ACT4065

High Input 2A Step Down Converter

FEATURES



2A Output Current



Up to 95% Efficiency



Up to 28V Input Range



8µA Shutdown Supply Current



200kHz Switching Frequency



Adjustable Output Voltage



Cycle-by-Cycle Current Limit Protection



Thermal Shutdown Protection



Frequency Foldback at Short Circuit



Stability with Wide Range of Capacitors,

Including Low ESR Ceramic Capacitors



SOP-8 Package

APPLICATIONS



TFT LCD Monitors



Portable DVDs



Car-Powered or Battery-Powered Equipments



Set-Top Boxes



Telecom Power Supplies



DSL and Cable Modems and Routers



Termination Supplies

GENERAL DESCRIPTION

The ACT4065 is a current-mode step-down

DC-DC converter that generates up to 2A output

current at 200kHz switching frequency. The

device

utilizes

Active-Semi’s

proprietary

ISOBCD30 process for operation with input

voltage up to 28V.

Consuming only 8μA in shutdown mode, the

ACT4065 is highly efficient with peak efficiency

at 95% when in operation. Protection features

include cycle-by-cycle current limit, thermal

shutdown, and frequency foldback at short

circuit.

The ACT4065 is available in SOP-8 package

and requires very few external devices for

operation.

Active-Semi, Inc.

- 1 -

www.active-semi.com

Data Sheet

Rev 2, 6/2006

Figure 1. Typical Application Circuit

ACT4065

IN

BS

EN

FB

G

COMP

SW

+

8.5V to 28V

ENABLE

5V/1.7A

5V/2A (<23V INPUT)

5V/1.7A (>23V INPUT)