1

FEATURES

DESCRIPTION

APPLICATIONS

V

IN

ENA

D1A

D2A

D1B

D2B

ENB

V

ENA

V

ENB

I

SET

V

BATT

TPS7510x

A3

A2

A1

C3

C2

C1

B1

B3

B2

TPS7510xYFF

9-BallWCSP

(TopView)

TPS7510x

SBVS080E – SEPTEMBER 2006 – REVISED JANUARY 2008

www.ti.com

Low Dropout, Two-Bank LED Driver with PWM Brightness Control

2

• Regulated Output Current with 2% LED-to-LED

The TPS7510x linear low dropout (LDO) matching

Matching

LED current source is optimized for low power

keypad

and

navigation

pad

LED

backlighting

• Drives up to Four LEDs at 25mA Each in a

applications. The device provides a constant current

Common Cathode Topology

to up to four unmatched LEDs organized in two banks

• 28mV Typical Dropout Voltage Extends Usable

of two LEDs each in a common-cathode topology.

Supply Range in Li-Ion Battery Applications

Without an external resistor, the current source

• Brightness Control Using PWM Signals

defaults to factory-programmable, preset current level

with ±0.5% accuracy (typical). An optional external

• Two 2-LED Banks with Independent Enable

resistor can be used to set initial brightness to

and PWM Brightness Control per Bank

user-programmable values with higher accuracy.

• No Internal Switching Signals—Eliminates EMI

Brightness can be varied from off to full brightness by

• Default LED Current Eliminates External

inputting a pulse width modulation (PWM) signal on

each Enable pin. Each bank has independent enable

Components

and brightness control, but current matching is done

–

Default values from 3mA to 10mA (in 1mA

to all four channels concurrently. The input supply

increments) available using innovative

range is ideally suited for single-cell Li-Ion battery

factory EEPROM programming

supplies and the TPS7510x can provide up to 25mA

–

Optional external resistor can be used for

per LED.

high-accuracy, user-programmable current

No internal switching signals are used, eliminating

• Over-Current and Over-Temperature

troublesome electromagnetic interference (EMI). The

Protection

TPS7510x is offered in an ultra-small, 9-ball, 0.4mm

ball-pitch wafer chip-scale package (WCSP), yielding

• Available in Wafer Chip-Scale Package

a very compact total solution size ideal for mobile

handsets and portable backlighting applications. The

• Keypad and Display Backlighting

• White and Color LEDs

• Cellular Handsets

• PDAs and Smartphones

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 © 2006–2008, 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.