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ACT4455

36V/5A Step Down DC/DC Converter

Active-Semi, Inc 

ACT4455

Rev 2, 21-Nov-12

36V/5A Step Down DC/DC Converter

FEATURES

• 7.5V to 36V Input Voltage

• 40V Input Voltage Surge

• Up to 5A Output Current

• Up to 12V Output Voltage

• Dual Outputs with Independent Over Current

Protection

• 7.5% Accurate Over Current Protection (OCP)

• Integrated 45mΩ High Side Power FET

• 90% Efficiency at Heavy Load

• Internal 3ms Soft Startup

• Low Standby Input Current

• Sleeping Mode at OCP, OTP and SCP

• Zero Input and Output Currents at Over Current

and Short Circuit Protection

• Auto Recovery into Full Load after Faults

• Output Cord Voltage Drop Compensation

• Stable with Low ESR Ceramic Output Capacitors

• Internal Cycle-by-Cycle Current Control

• Programmable Over Current Setting

• SOP-8EP Package

APPLICATIONS

• Automotive Industry

• Dual-Output Car Charger

• LCD-TV

GENERAL DESCRIPTION

ACT4455 is a wide input voltage step-down DC/DC

converter with high-side MOSFET integrated. It

provides up to 5A continuous output current at

200kHz switching frequency. The converter can be

configured as single output or dual outputs with

independent over current protection. The converter

achieves high efficiency and excellent load and line

regulation. The converter enters into hiccup and

sleeping mode and the converter power

consumption is nearly zero when output is

overloaded or shorted to ground. Other protection

features includes cycle-by-cycle current limit, under

voltage protection and thermal shutdown. The

device is available in SOP8-EP package.

100

90

80

70

60

50

0

Efficiency vs. Load current

VIN = 12V

VIN = 32V

VIN = 24V

1000

2000

3000

4000 5000

Efficiency (%)

Innovative PowerTM

-1-

www.active-semi.com

Copyright © 2012 Active-Semi, Inc.

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