LP5526

SW

MAIN

SUB

RLED

GLED

BLED

Li-Ion Battery

or Charger

= 150 mA

= 8V...20 V

FB

VDD2

10 F

L1

10 PH

P

MCU

SCL

SDA

SUB BACKLIGHT

0...25 mA/LED

MAIN BACKLIGHT

0...25 mA/LED

NRST

VDDIO

IRGB

IRT

VDDA

100 nF

VREF

D1

VDD1

100 nF

GND 1-5

100 nF

1 PF

GPIO[0]/PWM

GPIO[1]

GPIO[2]

2 x 4.7 uF

FLASH

0...150 mA

82 k

Ö

LP5526

www.ti.com

SNVS431C – FEBRUARY 2006 – REVISED JULY 2009

LP5526 Lighting Management Unit with High Voltage Boost Converter with up to 150mA

Serial FLASH LED Driver

Check for Samples: LP5526

1

FEATURES

•

25-bump micro SMD Package: (2.54mm x

2.54mm x 0.6mm)

2

•

High efficiency boost converter with

programmable output voltage up to 20V

APPLICATIONS

•

2 individual drivers for serial display backlight

•

Cellular Phones and PDAs

LEDs

•

MP3 Players

•

Automatic dimming controller

•

Digital Cameras

•

Stand alone RGB controller

•

Dedicated flash function

•

Safety function to avoid prolonged flash

•

3 general purpose IO pins

DESCRIPTION

LP5526 is a Lighting Management Unit for portable applications. It is used to drive display backlights, keypad

LEDs, RGB LEDs and camera flash LEDs. LP5526 can drive 2 separately connected strings of LEDs with high

voltage boost converter. The RGB driver allows driving either individual color LEDs or RGB LED from separate

supply power, or it can be used to drive series connecter flash LEDs from high voltage boost converter.

The backlight drivers (MAIN and SUB pins) are both high resolution constant current mode drivers. The flash

outputs can drive series connected flash LED with up to 150mA of current. External PWM control can be used for

dimming any selected LED outputs or it can be used to trigger the flash. The flash has also 1-second safety

timer.

connections.

Typical Application

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2006–2009, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.