ACT4455
Rev 2, 21-Nov-12
36V/5A Step Down DC/DC Converter
FEATURES
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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
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Automotive Industry
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Dual-Output Car Charger
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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.
Efficiency vs. Load current
100
ACT4455-001
V
IN
= 12V
Output current (V)
90
80
V
IN
= 32V
70
V
IN
= 24V
60
50
0
1000
2000
3000
4000
5000
Efficiency (%)
Innovative Power
TM
-1-
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ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
