ACT4088

Rev0, 13-May-08

- 2 -

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Copyright © 2008 Active-Semi, Inc.

ORDERING INFORMATION

PIN CONFIGURATION

PIN DESCRIPTIONS

PART NUMBER

TEMPERATURE RANGE

PACKAGE

PINS

PACKING

ACT4088US-T

-40°C to 85°C

SOT23-6

6

TAPE & REEL

TOP MARK

FRWJ

SOT23-6

PIN NUMBER

PIN NAME

PIN DESCRIPTION

1

SW

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

2

IN

Power supply input. Bypass this pin with a 10µF ceramic capacitor to G, placed as

close to the IC as possible.

3

EN

Enable Input. EN is pulled up to 5V with a 2µA current, and contains a precise 1.24V

logic threshold. Drive this pin to a logic-high or leave unconnected to enable the IC.

Drive to a logic-low to disable the IC and enter micro-power shutdown mode.

4

FB

Feedback Input. The voltage at this pin is regulated to 0.81V. Connect to the center

point of a resistive voltage-divider between OUT and G to set the output voltage.

5

G

Ground and Heat sink. Connect this pin to a large, uncovered PCB copper area for

best heat dissipation.

6

BST

Bootstrap. This pin acts as the power supply for the high-side switch’s gate driver.

Connect a 22nF capacitor between this pin and SW.

6

5

4

1

2

3

ACT4088

BST

G

FB

SW

IN

EN