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APPLICATIONS

DESCRIPTION

Vin

SW

Gnd

SEL2

SEL1

ISET1

IFB1

R1

Iout

IFB2

ISET2

R2

2.5Vto6V

Input

L110 H

m

C1

1 F

m

C2

1 F

m

TPS61150, TPS61151

SLVS625A – FEBRUARY 2006 – REVISED MARCH 2007

DUAL OUTPUT BOOST WLED DRIVER

USING SINGLE INDUCTOR

In addition to the small inductor, small capacitor and

3 mm x 3 mm QFN package, the built-in MOSFET

• 2.5-V to 6-V Input Voltage Range

and diode eliminate the need for any external power

• Two Outputs Each up to 27 V

devices. Overall, the IC provides an extremely

compact solution with high efficiency and plenty of

• 0.7-A Integrated Switch

flexibility.

• Built-In Power Diode

• 1.2-MHz Fixed PWM Frequency

• Individually Programmable Output Current

• Input-to-Output Isolation

• Built-In Soft Start

• Overvoltage Protection

• Up to 83% Efficiency

• Up to 30 kHz PWM Dimming Frequency

• Available in a 10 Pin, 3 × 3 mm QFN Package

• Sub and Main Display Backlight in Clam Shell

Phones

• Display and Keypad Backlight

• Up to 14 WLED Driver

The TPS61150/1 is a high frequency boost converter

with

two

regulated

current

outputs

for

driving

WLEDs. Each current output can be individually

programmed through external resistors. There is

dedicated selection pin for each output, so the two

outputs

can

be

turned

on

separately

or

simultaneously. The output current can be reduced

by a pulse width modulation (PWM) signal on the

select pins or an analog voltage on the ISET pin,

resulting in PWM dimming of the WLEDs. The boost

regulator runs at 1.2 MHz fixed switching frequency

to reduce output ripple and avoid audible noises

associated with PFM control.

The two current outputs are ideal for driving WLED

backlight for the sub and main displays in clam shell

phones. The two outputs can also be used for driving

display and keypad backlights. When used together,

the two outputs can drive up to 14 WLED for one

large display.

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.

PRODUCTION DATA information is current as of publication date.

Copyright © 2006–2007, 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.