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ACT4070 fiches techniques PDF

Active-Semi - Wide Input 3A Step Down Converter

Numéro de référence ACT4070
Description Wide Input 3A Step Down Converter
Fabricant Active-Semi 
Logo Active-Semi 





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ACT4070 fiche technique
www.DataSheet4U.com
ACT4070
Rev 0, 12/2006
Wide Input 3A Step Down Converter
FEATURES
 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
 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
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
devices for operation.
TYPICAL APPLICATION CIRCUIT
Innovative Products. Active Solutions.
-1-
Copyright © 2006 Active-Semi, Inc.
www.active-semi.com

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