REV. A

ADP3610

–9–

TFT LCD System Design

The ADP3610 is very useful for applications like notebook LCD

displays which require a low profile solution. Figure 22 shows a

typical LCD display application. A TFT LCD display requires

+5 V main voltage and +17 V and –5 V auxiliary voltages. The

ADP3610 doubles the input voltage, which is then fed through a

discrete linear regulator to generate +5 V. The main voltage is

also fed to the ADP3605, which inverts the input voltage to

generate –5 V. The CP+ node of the ADP3605 pump capacitor

is fed to a diode-capacitor ladder network to quadruple the main

voltage, i.e., 4

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

SD

CM1

GND

GND

GND

CM2

CP1

GND

CP2

ADP3610

1 F

1 F

CP1

2.2 F

1 F

CP2

2.2 F

2.2 F

2.2 F

1 F

1 F

1 F

1 F

0.1 F

1 F

25.5k

24.9k

1k

470

150mA

3mA

CP+

GND

SD

NC

CP–

2.2 F

1 F

30mA

NC = NO CONNECT

ADP3605

2.2 F

TL431

Figure 22. LCD Display Application