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ACT4082AUS-T

16V, 1.2A, 1.4MHz Step-Down DC/DC Converter in SOT23-6

Active-Semi, Inc 

Active-Semi

ACT4082A

Rev0, 16-May-08

ORDERING INFORMATION

PART NUMBER TEMPERATURE RANGE

ACT4082AUS-T

-40°C to 85°C

PACKAGE

SOT23-6

PINS

6

PACKING TOP MARK

TAPE & REEL

FMGD

PIN CONFIGURATION

SW 1

6 BST

IN 2 ACT4082A 5 G

EN 3

4 FB

SOT23-6

PIN DESCRIPTIONS

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.

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

3

EN

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.

Innovative PowerTM

-2-

www.active-semi.com

Copyright © 2008 Active-Semi, Inc.

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