ACT4012A
Rev0, 16-May-08
ORDERING INFORMATION
PART NUMBER
ACT4012ASH
ACT4012ASH-T
TEMPERATURE RANGE
-40°C to 85°C
-40°C to 85°C
PACKAGE
SOP-8
SOP-8
PINS
8
8
PACKING
TUBE
TAPE & REEL
PIN CONFIGURATION
BS
1
8
N/C
IN
2
7
EN
ACT4012ASH
SW
3
6
COMP
G
4
5
FB
SOP-8
PIN DESCRIPTIONS
PIN NUMBER
1
2
3
4
5
6
7
8
PIN NAME
BS
IN
SW
G
FB
COMP
EN
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 Heat sink. 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 resis-
tor 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. EN pin has
a small internal pull-up current to IN when pin is not connected.
Not Connected.
Innovative Power
TM
-2-
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ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
