ACT4070
Rev 2, 16-Sep-11
Wide Input 3A Step Down Converter
FEATURES
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3A Output Current
Up to 95% Efficiency
4.5V to 30V Input Range
6µA Shutdown Supply Current
400kHz 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
GENERAL DESCRIPTION
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 6μA 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 de-
vices for operation.
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SOP-8/EP (Exposed Pad) Package
NOTE:
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Refer to the last page (Page11) for the End of
Life Notice of the Part Number.
APPLICATIONS
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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 Power
TM
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www.active-semi.com
Copyright © 2011 Active-Semi, Inc.
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
