®
ACT4065A
Rev 0, 23-Apr-12
High Input 2A Step Down Converter
FEATURES
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2A Output Current
Up to 95% Efficiency
6.0V to 30V Input Range
210kHz Switching Frequency
Adjustable Output Voltage
Cycle-by-Cycle Current Limit Protection
Thermal Shutdown Protection
Frequency Foldback at Short Circuit
Stability with Wide Range of Capacitors,
Including Low ESR Ceramic Capacitors
GENERAL DESCRIPTION
The ACT4065A is a current-mode step-down
DC/DC converter that generates up to 2A output
current at 210kHz switching frequency.
The ACT4065A is highly efficient with peak effi-
ciency at 95% when in operation. Protection fea-
tures include cycle-by-cycle current limit, thermal
shutdown, and frequency foldback at short circuit.
The ACT4065A is available in SOP-8 package and
requires very few external devices for operation.
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SOP-8 Package
Note: ACT4065A is the drop-in replacement for
ACT4065 with feedback resistance value change.
APPLICATIONS
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TFT LCD Monitors
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Portable DVDs
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Car-Powered or Battery-Powered Equip-
ments
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Set-Top Boxes
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Telecom Power Supplies
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DSL and Cable Modems and Routers
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Termination Supplies
Efficiency vs. Load current
ACT4065A-001
95
V
IN
= 12V
90
Efficiency (%)
85
V
IN
= 24V
80
75
V
OUT
= 5V
70
10
100
1000
10000
Load Current (mA)
Innovative Power
TM
-1-
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