V

IN

ENA

D1A

D2A

D1B

D2B

ENB

V

ENA

V

ENB

I

SET

V

BATT

TPS7510x

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

TPS75100, TPS75103, TPS75105

SBVS080J – SEPTEMBER 2006 – REVISED NOVEMBER 2016

TPS7510x Low Dropout, Two-Bank LED Driver With PWM Brightness Control

1

1 Features

1

•

Regulated Output Current with 2% LED-to-LED

Matching

•

Drives Up to Four LEDs at 25 mA Each in a

Common Cathode Topology

•

28-mV Typical Dropout Voltage Extends Usable

Supply Range in Li-Ion Battery Applications

•

Brightness Control Using PWM Signals

•

Two 2-LED Banks With Independent Enable and

PWM Brightness Control per Bank

•

No Internal Switching Signals—Eliminates EMI

•

Default LED Current Eliminates External

Components

–

Default Values from 3 mA to 10 mA (in 1-mA

Increments) Available Using Innovative Factory

EEPROM Programming

–

Optional External Resistor can be Used for

High-Accuracy, User-Programmable Current

•

Over current and Over temperature Protection

•

Available in Wafer Chip-Scale Package

or 2.50-mm × 2.50-mm WSON-10

2 Applications

•

Keypad and Display Backlighting

•

White and Color LEDs

•

Cellular Handsets

•

PDAs and Smartphones

3 Description

The TPS7510x linear low dropout (LDO) matching

LED current source is optimized for low-power

keypad

and

navigation

pad

LED

backlighting

applications. The device provides a constant current

to up to four unmatched LEDs organized in two banks

of two LEDs each in a common-cathode topology.

Without an external resistor, the current source

defaults to a factory-programmable, preset current

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

external resistor can be used to set initial brightness

to user-programmable values with higher accuracy.

Brightness can be varied from off to full brightness by

inputting a pulse width modulation (PWM) signal on

each enable pin (ENx, where x indicates LED bank A

or B). Each bank has independent enable and

brightness control, but current matching is done to all

four channels concurrently. The input supply range is

ideally suited for single-cell Li-Ion battery supplies

and the TPS7510x can provide up to 25 mA per LED.

No internal switching signals are used, eliminating

troublesome electromagnetic interference (EMI). The

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

ball-pitch wafer chip-scale package (WCSP) and a

2.50-mm × 2.50-mm, 10-pin WSON package, yielding

a very compact total solution size ideal for mobile

handsets and portable backlighting applications. The

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

TPS7510x

WSON (10)

2.50 mm × 2.50 mm

DSBGA (9)

1.208 mm x 1.208 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application Diagram