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1

1 MW

C1

100 nF

C3

L

VIN

SW

DO

FB

L1

D1

MBR0530

GND

CTRL

PGND

Enable / LCD bias control

C2

4.7uF

R2

R1

R3

Cff

22 pF

4.7 mH

2.2 MW

1 mF

16.2 V to 18.9 V/ 10 mA

180 kW

1

2

5

6

8

3

4

7

TPS61045

SLVS440A – JANUARY 2003 – REVISED SEPTEMBER 2003

DIGITALLY ADJUSTABLE LCD BOOST CONVERTER

FEATURES

DESCRIPTION

•

Input Voltage Range . . . 1.8 V to 6.0 V

The TPS61045 is a high frequency boost converter with

digitally programmable output voltage and true shut-

•

Up to 85% Efficiency

down. During shutdown the output is disconnected

•

Digitally Adjustable Output Voltage Control

from the input by opening the internal input switch. This

•

Disconnects Output From Input During Shut-

allows a controlled power up/down sequencing of the

display. The output voltage can be increased or de-

down

creased in digital steps by applying a logic signal to the

•

Switching Frequency . . . Up to 1 MHz

CTRL pin. The output voltage range, as well as the

•

No Load Quiescent Current . . . 40 µA Typ

output voltage step size, can be programmed with the

feedback divider network. With a high switching fre-

•

Thermal Shutdown Mode

quency of up to 1 MHz the TPS61045 allows the use of

•

Shutdown Current . . . 0.1 µA Typ

small external components and together, with the small

•

Available in Small 3mm

× 3mm QFN package

8-pin QFN package, a miminum system solution size is

achieved.

APPLICATIONS

•

LCD Bias Supply For Small to Medium LCD

Displays

•

OLED Display Power Supply

– PDA, Pocket PC, Smart Phones

– Handheld Devices

– Cellular Phones

Figure 1. Typical Application

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 © 2003, Texas Instruments Incorporated

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily in-

clude testing of all parameters.