ACT6357/ACT6358

Rev 1, 15-Nov-12

- 2 -

www.active-semi.com

Copyright © 2012 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. Multifunction pin accepts either a PWM or analog control signal. When using a

PWM control signal, the best results are achieved when the PWM frequency is in the 100Hz to

10kHz range and when the PWM high voltage is 1.8V or higher. When using an analog control sig-

nal, the best results are achieved when the control voltage is in the 0V to 1.8V range.

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