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ACT4012 Datasheet Preview

ACT4012 Datasheet

Wide Input 1.5A Step Down Converter

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Data Sheet
Rev 1, 10/2006
ACT4012
Wide Input 1.5A Step Down Converter
FEATURES
1.5A Output Current
Up to 94% Efficiency
Up to 20V Input Range
10µA Shutdown Supply Current
400kHz 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
SOP-8 Package
APPLICATIONS
TFT LCD Monitors
Portable DVDs
Car-Powered or Battery-Powered Equipments
Set-Top Boxes
Telecom Power Supplies
DSL and Cable Modems and Routers
Termination Supplies
GENERAL DESCRIPTION
The ACT4012 is a current-mode step-down
DC-DC converter that generates up to 1.5A
output current at 400kHz switching frequency.
The device utilizes Active-Semi’s proprietary
ISOBCD20 process for operation with input
voltage up to 20V.
Consuming only 10μA in shutdown mode, the
ACT4012 is highly efficient with peak efficiency
at 94% when in operation. Protection features
include cycle-by-cycle current limit, thermal
shutdown, and frequency foldback at short
circuit.
The ACT4012 is available in SOP-8 package
and requires very few external devices for
operation.
Active-Semi, Inc.
Figure 1. Typical Application Circuit
1
www.active-semi.com




Active-Semi

ACT4012 Datasheet Preview

ACT4012 Datasheet

Wide Input 1.5A Step Down Converter

No Preview Available !

ACT4012
ORDERING INFORMATION
PART NUMBER
ACT4012SH
ACT4012SH-T
TEMPERATURE RANGE
-40°C to 85°C
-40°C to 85°C
PIN CONFIGURATION
PACKAGE
SOP-8
SOP-8
PINS PACKING
8 TUBE
8 TAPE & REEL
BS 1
IN 2
SW 3
G4
ACT4012SH
SOP-8
8 N/C
7 EN
6 COMP
5 FB
PIN DESCRIPTION
PIN NUMBER PIN NAME
1 BS
2 IN
3 SW
4G
5 FB
6 COMP
7 EN
8 N/C
PIN DESCRIPTION
Bootstrap. This pin acts as the positive rail for the high-side switch’s gate driver.
Connect a 10nF between this pin and SW.
Input Supply. Bypass this pin to G with a low ESR capacitor. See Input Capacitor in
Application Information section.
Switch Output. Connect this pin to the switching end of the inductor.
Ground and Heatsink. Connect to a large, uncovered PCB copper area for best heat
dissipation.
Feedback Input. The voltage at this pin is regulated to 1.293V. Connect to the resistor
divider between output and ground to set output voltage.
Compensation Pin. See Compensation Technique in Application Information section.
Enable Input. When higher than 1.3V, this pin turns the IC on. When lower than 0.7V,
this pin turns the IC off. Output voltage is discharged when the IC is off. This pin has a
small internal pull up current to a high level voltage when pin is not connected. Do not
allow EN to exceed 6V.
Not Connected.
Active-Semi, Inc.
2 www.active-semi.com


Part Number ACT4012
Description Wide Input 1.5A Step Down Converter
Maker Active-Semi
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ACT4012 Datasheet PDF






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