ACT4012
Wide Input 2A Step Down Converter
FEATURES
2A Output Current
Up to 92% Efficiency
Up to 20V Input Range
8µA Shutdown Supply Current
410kHz 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 ACT4012 is a current-mode step-down
DC-DC converter that generates up to 2A output
current at 410kHz switching frequency. The
device
utilizes
Active-Semi’s
proprietary
ISOBCD20 process for operation with input
voltage up to 20V.
Consuming only 8μA in shutdown mode, the
ACT4012 is highly efficient with peak efficiency
at 92% when in operation. Protection features
include cycle-by-cycle current limit, thermal
shutdown, and frequency foldback at short
circuit.
The ACT4012 is available in SOP-8 package
and requires very few external devices for
operation.
Active-Semi, Inc.
- 1 -
www.active-semi.com
Figure 1. Typical Application Circuit
Data Sheet
Rev PrA, 6/2006
ACT4012
IN
BS
EN
FB
G
COMP
SW
+
VIN
ENABLE
12V
2.5V/2A
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