Active-Semi
FEATURES
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3.5A Output Current
Up to 96% Efficiency
4.5V to 15V Input Range
12µA Shutdown Supply Current
400kHz Switching Frequency
Adjustable Output Voltage From 0.817V
Cycle-by-Cycle Current Limit Protection
Thermal Shutdown Protection
Frequency Fold-Back at Short Circuit
ACT4050
Rev 2, 01-Jul-11
Wide Input 3.5A Step Down Converter
GENERAL DESCRIPTION
The ACT4050 is a current-mode step-down DC/DC
converter that provides up to 3.5A of output current
at 400kHz switching frequency. The device utilizes
Active-Semi’s proprietary high voltage process for
operation with input voltages up to 15V.
The ACT4050 provides fast transient response and
eases loop stabilization while providing excellent
line and load regulation. This device features a very
low ON-resistance power MOSFET which provides
peak operating efficiency up to 96%. In shutdown
mode, the ACT4050 consumes only 12μA of supply
current.
This device also integrates protection features
including cycle-by-cycle current limit, thermal
shutdown and frequency fold-back at short circuit.
The ACT4050 is available in a SOP-8/EP (Exposed
Pad) package and requires very few external
devices for operation.
Stability with Wide Range of Capacitors,
Including Low ESR Ceramic Capacitors
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SOP-8/EP (Exposed Pad) Package
APPLICATIONS
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Digital TV
Portable DVDs
Car-Powered or Battery-Powered Equipments
Set-Top Boxes
Telecom Power Supplies
Consumer Electronics
TYPICAL APPLICATION CIRCUIT
Efficiency vs. Load Current
100
ACT4050-001
V
IN
= 7V
90
V
IN
= 12V
Efficiency (%)
80
70
60
V
OUT
= 5V
0
500
1000
1500
2000
2500
3000
3500
50
Load Current (mA)
Innovative Power
TM
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www.active-semi.com
Copyright © 2011 Active-Semi, Inc.
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
