MAX8739(2006) Просмотр технического описания (PDF) - Maxim Integrated

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MAX8739
(Rev.:2006)

TFT, LCD, DC-DC Converter with Operational Amplifiers

Maxim Integrated 

TFT, LCD, DC-DC Converter with

Operational Amplifiers

Typical Application Circuit

The MAX8739 typical application circuit (Figure 1) gen-

erates a +8V source-driver supply and approximately

+22V and -7V gate-driver supplies for TFT displays.

The input-voltage range for the IC is from +1.8V to

+5.5V but the Figure 1 circuit is designed to run from

1.8V to 2.7V. Table 1 lists the key recommended com-

ponents and Table 2 lists the contact information of the

component suppliers.

VGOFF

-7V/20mA

VIN

+1.8V TO +2.7V

C1

10µF

6.3V

100kΩ

C13

0.1µF

R4

10Ω

C4

1µF

C5

220pF

R3

100kΩ

C6

33pF

TO VCOM

BACKPLANE

C7

1µF

C8

0.033µF

FROM TCON

D2

C14

0.1mF

C15

0.1mF

C16

0.1mF

L1

3.0µH

D3

D1

R1

LX

169kΩ

1%

IN

FB

R2

MAX8739

30.9kΩ

1%

FREQ

AGND

COMP

NEG1

OUT1

NEG2

OUT2

LDO

PGND

SUP

POS1

POS2

C10

0.1µF

C11

0.1µF

D4

C17

0.1µF

C18

0.1µF

C2

4.7µF

10V

C3

4.7µF

10V

R5*

R7*

C12

R6*

R8*

0.1µF

DEL

SRC

DRN

CTL

COM

VGON

+22V/10mA

R9

5kΩ

VMAIN

+8V/250mA

*THE RATIO OF THE VOLTAGE DIVIDER DEPENDS ON THE EXACT APPLICATION REQUIREMENTS. USE

RESISTORS IN THE 100kΩ AND 500kΩ RANGE.

Figure 1. Typical Application Circuit

______________________________________________________________________________________ 11

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