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Copyright © 2006 Active-Semi, Inc.

ACT4072

ORDERING INFORMATION

PART NUMBER

TEMPERATURE RANGE

PACKAGE

PINS

PACKING

ACT4072SH

-40°C to 85°C

SOP-8

8

TUBE

ACT4072SH-T

-40°C to 85°C

SOP-8

8

TAPE & REEL

PIN CONFIGURATION

PIN DESCRIPTION

SOP-8

PIN

NUMBER

PIN NAME

PIN DESCRIPTION

1

BS

Bootstrap. This pin acts as the positive rail for the high-side switch’s gate driver. Con-

nect a 10nF between this pin and SW.

2

IN

Input Supply. Bypass this pin to G with a low ESR capacitor. See Input Capacitor in Ap-

plication Information section.

3

SW

Switch Output. Connect this pin to the switching end of the inductor.

4

G

Ground.

5

FB

Feedback Input. The voltage at this pin is regulated to 1.222V. Connect to the resistor

divider between the output and ground to set output voltage.

6

COMP

Compensation Pin. See Compensation Techniques in Application Information section.

7

EN

Enable Input. Drive higher than 1.3V or leave unconnected to enable the IC. Drive lower

than 0.7V to disable the IC. When disabled, the IC is in 6

μA low current shutdown mode

and the output is discharged through the Low-Side Power Switch. This pin has a small

internal pull up current to a high level voltage when pin is not connected.

8

N/C

Not Connected.