Data Sheet
Rev 2, 6/2006
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
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.
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
5V/2A (<23V INPUT)
5V/1.7A (>23V INPUT)
BS
8.5V to 28V
IN
SW
5V/1.7A
ACT4065
ENABLE
EN
G
FB
COMP
+
Figure 1. Typical Application Circuit
Active-Semi, Inc.
-1-
www.micro-bridge.com
ETC [ ETC ]
