ADP3610 Просмотр технического описания (PDF) - Analog Devices

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ADP3610

320 mA Switched Capacitor Voltage Doubler

Analog Devices 

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 × VMAIN – 6 × VDIODE ≈ 17 V.

CP1

2.2␮F

ADP3610

VIN = 3.0V TO 3.6V

1␮F

1␮F

ADP3610

1 VIN

VIN 16

2 SD

VIN 15

3 CM1 CP1 14

4 GND GND 13

5 GND

6 GND

7 CM2

VOUT 12

VOUT 11

CP2 10

8 VIN

VIN 9

CP2

2.2␮F

1␮F 1k⍀ 0.1␮F 25.5k⍀

1␮F

470⍀

TL431

24.9k⍀

2.2␮F 2.2␮F

1␮F

1␮F

1␮F 1␮F

2.2␮F

ADP3605

CP+

VIN

GND VOUT

CP–

NC

SD

VSNS

1␮F

2.2␮F

VGL = –5V @

30mA

NC = NO CONNECT

Figure 22. LCD Display Application

VMAIN = 5V @

150mA

VGH = 17V @

3mA

REV. A

–9–

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