ACT4455

Rev 2, 21-Nov-12

Innovative Power

TM

- 2 -

www.active-semi.com

Copyright © 2012 Active-Semi, Inc.

ORDERING INFORMATION

PART NUMBER

OPERATION TEMPERATURE RANGE

PACKAGE

PINS

PACKING

ACT4455YH-T

-40°C to 85°C

SOP-8EP

8

TAPE & REEL

PIN CONFIGURATION

PIN DESCRIPTIONS

PIN

NAME

DESCRIPTION

1

CS1

116mV for 750µs, the IC shuts down for 2.5 seconds before initiating a restartup.

2

SW

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

3

HSB

High Side Bias. This pin acts as the positive rail for the high-side switch’s gate driver.

Connect a 22nF-100nF capacitor between HSB and SW pins.

4

GND

Ground.

5

COMP

Compensation Node. COMP is used to compensate the voltage regulation loop.

6

FB

Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a

resistive voltage divider from the output voltage. The feedback threshold is 0.808V.

See Setting the Output Voltage.

7

IN

Input Supply. Bypass this pin to GND with a 10µF or greater low ESR capacitor.

8

CS2

116mV for 750µs, the IC shuts down for 2.5 seconds and then restarts.

Exposed Pad

Exposed Pad. Connect this pad to thick copper plane via copper vias.