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FEATURES

DESCRIPTION

APPLICATIONS

TYPICAL APPLICATION

Vin

GND

SEL V

SELI

ISET

L1 10 H

m

IFB

VFB

Vout

Iout

SW

R3

R1

R2

C1

4.7 F

m

C2

4.7 F

m

C3

1 F

m

3 V to 6 V Input

TPS61140

TPS61141

SLVS624A – JANUARY 2006 – REVISED FEBRUARY 2006

DUAL OUTPUT BOOST REGULATOR USING SINGLE INDUCTOR

•

3V to 6 V Input Voltage Range

The TPS61140/1 is a dual output boost converter IC.

It is intended to be configured as a highly integrated

•

Two Outputs Each up to 27 V

power

solution

providing

regulated

voltage

and

•

0.7 A Integrated Switch

current output with one boost converter. This device

•

Built-in Power Diode

is ideal for driving the OLED sub display and WLED

•

1.2 MHz PWM for WLED Driver

backlight for the LCD main display in clam shell

phones. The voltage and current can be individually

•

PFM for OLED Supply

programmed through external resistors. There is a

•

Individually Programmable Output

dedicated selection pin for each output, so the two

•

Input to Output Isolation

outputs

can

be

turned

on

separately

or

simultaneously. When only the voltage output is

•

Short-Circuit Protection

enabled, the boost converter is controlled by pulse

•

Built-in Soft Start

frequency modulation (PFM) in order to achieve high

•

Overvoltage Protection

efficiency over a wide load range. If the current output

is selected, the device adopts a 1.2 MHz pulse width

•

Up to 82% Efficiency

modulation

control

(PWM)

method

in

order

to

•

Up to 30 kHz PWM Dimming Frequency

maximize output current. Applying an external PWM

•

Available in a 10 Pin, 3

× 3 mm QFN Package

signal to the select pin (SELI) reduces the output

current thereby allowing WLED dimming.

The TPS61140/1 has a built-in power MOSFET and

•

Clamshell Phone With OLED/LCD Screen

power diode; thereby, eliminating the needs for any

external active power components. In addition, the

high

switching

frequency

reduces

the

external

inductor and capacitor sizes. Overall, the IC provides

a highly compact solution with high efficiency and

plenty of flexibility.

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, 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.