ACT6357/ACT6358

Rev PrB, 30-Aug-07

- 2 -

www.active-semi.com

Copyright © 2007 Active-Semi, Inc.

PART NUMBER

CURRENT

LIMIT

TEMPERATURE

RANGE

PACKAGE

PACKAGING

ACT6357NH-T

0.5A

-40°C to 85°C

TDFN33-8

TAPE & REEL

ACT6358NH-T

1A

-40°C to 85°C

TDFN33-8

TAPE & REEL

PINS

8

8

PIN

NAME

DESCRIPTION

1

2

IN

Supply Input

3

EN

Enable Control. Drive to a logic high to enable the device. Connect to a logic low to disable the

device. EN should not be left floating; connect EN to IN when unused.

4

BC

Brightness Control. Accepts either a PWM or analog control signal to perform LED brightness

control. For best results, PWM frequency must be between 100Hz and 10kHz, with high level

above 1.7V. Analog control signal must be in the 0 to 1.5V range, providing a LED brightness

dynamic range of 10 to 1.

5

FB

Feedback Input. Connect this pin to the cathode of the bottom LED, and a current feedback

resistor between this pin and G to set the LED bias current.

6

SS

Soft Start Control Input. Connect a capacitor from this pin to G to program the soft start

duration. SS is internally discharged when IC the is disabled.

7

OV

Over Voltage Protection Input. The IC is automatically disabled when the voltage at this pin

exceeds 1.21V. Connect OV to the center point of a resistive voltage divider connected across

the LED string.

Ground

G

8

SW

Switch Output. Connect this pin to the inductor and the Schottky diode.

EP

EP

Exposed Pad. Connect to ground.

PIN CONFIGURATION

PIN DESCRIPTIONS

ORDERING INFORMATION

ACT6357

ACT6358

1

2

3

4

8

7

6

5

G

IN

BC

EN

SW

SS

FB

OV

TDFN33-8