Rev PrA, 13-Aug-07
Advanced Product Information – All Information Subject to Change
ACT4075
Wide Input 2.5A Step Down Converter
FEATURES
2.5A Output Current
Up to 95% Efficiency
4.5V to 32V Input Range
6µA Shutdown Supply Current
410kHz Switching Frequency
Adjustable Output Voltage
Cycle-by-Cycle Current Limit Protection
Thermal Shutdown Protection
Internal Soft Start Function
Frequency Fold Back at Short Circuit
Stability with Wide Range of Capacitors,
Including Low ESR Ceramic Capacitors
The ACT4075 is a current-mode step-down DC/DC
converter that generates up to 2.5A output current
at 410kHz switching frequency. The device utilizes
Active-Semi’s proprietary ISOBCD30 process for
operation with input voltage up to 32V.
Consuming only 6μA in shutdown mode, the
ACT4075 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 ACT4075 is available in SOP-8/EP exposed
pad package and requires very few external de-
vices for operation.
GENERAL DESCRIPTION
SOP-8/EP (Exposed Pad) Package
APPLICATIONS
TFT LCD Monitors or Televisions and HDTV
Portable DVD Players
Car-Powered or Battery-Powered Equipment
Set-Top Boxes
Telecom Power Supplies
DSL and Cable Modems and Routers
TYPICAL APPLICATION CIRCUIT
Innovative Products.
Active Solutions.
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Copyright © 2007 Active-Semi, Inc.
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
