ACT4075YH 查看數據表（PDF） - Active-Semi, Inc

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ACT4075YH

Wide Input 2.5A Step Down Converter

Active-Semi, Inc 

ACT4075

Rev PrA, 13-Aug-07

Advanced Product Information – All Information Subject to Change

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

 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 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.

TYPICAL APPLICATION CIRCUIT

Innovative Products. Active Solutions.

-1-

www.active-semi.com

Copyright © 2007 Active-Semi, Inc.

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