PPMIC BU

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BL9582 Rev 1.2

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2/2010

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3

BL9582

32V, 1.4A Step-down

High Brightness LED Driver with Internal Switch

Pin Description

PIN

NAME

FUNCTION

1

LX

Drain of NDMOS switch

2

GND

Ground (0V)

3

ADJ

Multi-function On/Off and brightness control pin:

• Leave floating for normal operation.

• Drive to voltage below 0.2V to turn off output current

• Drive with PWM signal from open-collector or open-drain transistor, to

adjust output current.

• Connect a capacitor from this pin to ground to activate soft-start.

(soft-start time is approx.0.06ms/nF)

4

5

Input voltage (6V to 32V). Decouple to ground with 4.7uF or higher X7R

ceramic capacitor close to device

Block Diagram

V o lta g e

R e g u la to r

2

3

5

4

1

GN D

AD J

C1

4.7uF

LX

1M ohm

5V

1.2V

R3

R2

R1

Rs

L1

D1

OT P

UV L O

0.2V

AD J

MN

B a n dga p