LTC3450

1

3450fa

, LTC and LT are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

The LTC

small thin film transistor (TFT) liquid crystal display (LCD)

panels. The device operates from a single Lithium-Ion cell,

2- to 3-cell alkaline input or any voltage source between

1.5V and 4.6V.

The synchronous boost converter generates a low noise,

high efficiency 5.1V, 10mA supply. Internal charge pumps

are used to generate 10V, 15V, and –5V, –10V or –15V.

Output sequencing is controlled internally to insure proper

initialization of the LCD panel.

A master shutdown input reduces quiescent current to

<2µA and quickly discharges each output for rapid turn off

of the LCD panel. The LTC3450 is offered in a low profile

(0.75mm), 3mm × 3mm 16-pin QFN package, minimizing

the solution profile and footprint.

■

Cellular Handsets with Color Display

5.1V at 10mA

– 5V, –10V, or –15V at 500µA

10V or 15V at 500µA

Shutdown

Blank Mode

Triple Output Power Supply

for Small TFT-LCD Displays

0.1µF

2.2µF

1.5V TO

4.6V

5.1V/10mA

15V/500µA

VGL

–10V/500µA

3450 TA01

0.1µF

0.1µF

11

7

8

10

14

13

V2X

V3X

SHDN

MODE

SW

LTC3450

GND

12

15

16

1

2

3

6

5

OFF ON

BLANK SCAN

47µH

4

9

2.2µF

0.47µF

0.1µF

0.1µF

5.1V, –10V, 15V Triple Output TFT-LCD Supply

1.5

100

95

90

85

80

75

70

3.0

4.0

3450 TA01b

2.0

2.5

3.5

4.5

5.0

100µH

47µH

5mA LOAD