ACT6390/ACT6391

Rev0, 13-May-08

- 2 -

www.active-semi.com

Copyright © 2008 Active-Semi, Inc.

PIN

NAME

DESCRIPTION

1

COMP

ground.

2

FB

Feedback Input. Connect this pin a resistor divider from the output to set the output voltage. FB

is regulated to 1.24V.

3

EN

Enable Control. Connect to a logic high level to enable the IC. Connect to a logic low level to

disable the IC. When unused, connect EN pin to IN (do not leave pin floating).

4

G

Ground.

5

SW

Switch Output. Connect this pin to the inductor and the schottky diode. To minimize EMI, mini-

mize the PCB trace path between this pin and the input bypass capacitor.

6

IN

Supply Input. Bypass to G with a 1µF or larger capacitor.

7

FREQ

Frequency Setting Pin. A logic low sets the switching frequency at 700kHz. A logic high sets

the switching frequency at 1.3MHz. This pin has an internal 5.5µA pull-down current.

8

SS

Soft Start Control Input. Connect a capacitor from this pin to G to set soft-start timing duration

soft start is not desired.

PIN CONFIGURATION

PIN DESCRIPTIONS

ORDERING INFORMATION

MSOP-8

PART

NUMBER

CURRENT

LIMIT

PACKAGING

ACT6390MH-T

1.7A

TAPE & REEL

ACT6391MH-T

2.5A

TAPE & REEL

TEMPERATURE

RANGE

-40°C to 85°C

-40°C to 85°C

PACKAGE

MSOP-8

MSOP-8

PINS

8

8

8

6

5

1

3

4

COMP

FB

G

SS

IN

SW

7

2

EN

FREQ

ACT6390

ACT6391