Active-Semi
ACT4072
Rev2, 27-May-08
Wide Input 2A Step Down Converter
FEATURES
• 2A Output Current
• Up to 95% Efficiency
• Up to 30V Input Range
• 6µA Shutdown Supply Current
• 420kHz Switching Frequency
• Adjustable Output Voltage
• Cycle-by-Cycle Current Limit Protection
• Thermal Shutdown Protection
• Frequency Fold-Back at Short Circuit
• Stability with Wide Range of Capacitors,
Including Low ESR Ceramic Capacitors
• SOP-8 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
GENERAL DESCRIPTION
The ACT4072 is a current-mode step-down DC/DC
converter that generates up to 2A output current at
420kHz 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
ACT4072 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 ACT4072 is available in SOP-8 package and
requires very few external devices for operation.
TYPICAL APPLICATION CIRCUIT
Up to 30V
BS
VIN
IN
SW
VOUT
ACT4072
ENABLE
EN
FB
G
COMP
+
Innovative PowerTM
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www.active-semi.com
Copyright © 2008 Active-Semi, Inc.