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.