ACT4070B
Rev 0, 23-Apr-12
Wide Input 3A Step Down Converter
FEATURES
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3A Output Current
Up to 95% Efficiency
6.5V to 30V Input Range
100µA Shutdown Supply Current
4mA Standby Input Current
300kHz Switching Frequency
Output Voltage Up to 12V
Cycle-by-Cycle Current Limit Protection
Thermal Shutdown Protection
Internal Soft Start Function
Frequency Fold Back at Short Circuit
Stability with Wide Range of Capacitors
Including Low ESR Ceramic Capacitors
SOP-8/EP (Exposed Pad) Package
GENERAL DESCRIPTION
ACT4070B is a wide input voltage step-down
DC/DC converter that provides up to 3A output cur-
rent at 300kHz switching frequency. ACT4070B is a
replacement part for ACT4070 with advanced fea-
tures such as lower standby current and higher light
load efficiency. ACT4070B can be dropped into
ACT4070 socket with only feedback resistance
value changed.
ACT4070B’s protection features include Cycle-by-
Cycle current limit, thermal shutdown, and fre-
quency foldback at over current and short circuit.
The devices are available in a SOP-8EP package
and require very few external devices for operation.
NOTE:
∗
ACT4070B
ACT4070.
is
the
replacement
part
for
APPLICATIONS
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TFT LCD Monitors or Televisions and HDTV
Portable DVD Players
Car-Powered or Battery-Powered Equipment
Set-Top Boxes
Telecom Power Supplies
DSL and Cable Modems and Routers
TYPICAL APPLICATION CIRCUIT
Efficiency vs. Load Current
100
V
IN
= 12V
80
ACT4070B-001
Efficiency (%)
60
V
IN
= 24V
40
20
V
OUT
= 5V
0
1
10
100
1000
10000
Load Current (mA)
Innovative Power
TM
-1-
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ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
