Li-Ion Battery

or Charger

V

DD_IO

D1

RGB_EN

NRST

RGB

120 mA

max. per

LED

0 - 25 mA

per LED

C

OUT

+

L1

V

WLED1

WLED2

WLED3

WLED4

WLED5

WLED6

FB

ROUT

GOUT

BOUT

LP3936

10 PH

10 PF

10 PF

Baseband

Processor

or

Microcontroller

I2C or

MicroWire/

SPI Interface

Main Display

Backlight

Sub Display

Backlight

0 - 25 mA

per LED

GND

4

4.1 - 5.3V

V

OUT =

MAX

I

MW_SEL

AIN

AREF

Optical

sensor

= 250 mA

V

IN

OUT

C

IN

DD

LP3936

www.ti.com

SNVS259D – NOVEMBER 2003 – REVISED MAY 2013

LP3936 Lighting Management System for Six White LEDs and One RGB or FLASH LED

Check for Samples: LP3936

1

FEATURES

APPLICATIONS

2

•

High Efficiency 250 mA Magnetic Boost DC-DC

•

Cellular Phones

Converter with Programmable Output Voltage

•

PDAs

•

PWM controlled RGB LED drivers with

programmable color, brightness, turn on/off

DESCRIPTION

slopes and blinking

LP3936 is a complete lighting management system

designed

for

portable

wireless

applications.

It

•

FLASH function with 3 drivers, each up to 120

contains a boost DC/DC converter, 4 white LED

mA current

drivers to drive the main LCD panel backlight, 2 white

•

4 constant current White LED drivers with

LED drivers for sub-LCD panel and 1 set of RGB

programmable 8-bit adjustment

LED drivers.

(0 … 25 mA/LED)

Both

WLED

groups

have

8-bit

programmable

•

2 constant current White LED drivers with

constant current drivers that are separately adjustable

programmable 8-bit adjustment

and matched to 1% (typ.). For efficient backlighting

(0 … 25 mA/LED)

the backlight intensity can be adjusted using the 8-bit

ADC with ambient light detection circuit.

•

8-bit ADC for ambient light sensor with

averaging

The

RGB

LED

drivers

are

PWM-driven

with

•

programmable color, intensity and blinking patterns.

serial interface

In addition, they feature a FLASH function to support

picture taking with camera-enabled cellular phones.

•

Low current Standby mode (software

controlled)

•

Low voltage digital interface down to 1.8V

•

Space efficient 32-pin TLGA laminate package

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 © 2003–2013, 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.