LM3503-44

Sw

En1

En2

Fb

Cntrl

AGND

PGND

L

22 PH

D

4.7 PF

1 PF

R1

MAIN:

2 to 5

LEDs

SUB:

2 to 5

LEDs

Logic

Voltage

Signal

Inputs

LM3503

www.ti.com

SNVS329E – JULY 2005 – REVISED MAY 2013

LM3503 Dual-Display Constant Current LED Driver with Analog Brightness Control

Check for Samples: LM3503

1

FEATURES

APPLICATIONS

2

•

Drives up to 4, 6, 8 or 10 White LEDs for Dual

•

Dual Display Backlighting in Portable devices

Display Backlighting

•

Cellular Phones and PDAs

•

>80% Peak Efficiency

DESCRIPTION

•

Output Voltage Protection Options: 16V, 25V,

The LM3503 is a white LED driver for lighting

35V & 44V

applications.

For

dual

display

backlighting

•

Input Under-Voltage Protection

applications,

the

LM3503

provides

a

complete

•

Internal Soft Start Eliminates Inrush Current

solution. The LM3503 contains two internal white LED

current bypass FET (Field Effect Transistor) switches.

•

1 MHz Constant Switching Frequency

The white LED current can be adjusted with a DC

•

Analog Brightness Control

voltage from a digital to analog converter or RC

•

Wide Input Voltage Range: 2.5V to 5.5V

filtered PWM (pulse-width-modulated) signal at the

•

Low Profile Packages: <1 mm Height

Cntrl pin.

–

10 Bump DSBGA

–

16 Pin WQFN

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 © 2005–2013, 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.