MAX8739 Просмотр технического описания (PDF) - Maxim Integrated

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MAX8739

TFT, LCD, DC-DC Converter with Operational Amplifiers

Maxim Integrated 

MAX8739

TFT, LCD, DC-DC Converter with

Operational Amplifiers

Typical Application Circuit

The MAX8739 typical application circuit (Figure 1) gener-

ates 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 components 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

0.1µF

C15

0.1µF

C16

0.1µF

L1

3.0µH

D1

LX

IN

FB

MAX8739

FREQ

COMP

NEG1

OUT1

NEG2

OUT2

LDO

AGND

PGND

SUP

POS1

POS2

D4

C17

C18

D3

0.1µF

0.1µF

R1

169kΩ

1%

R2

30.9kΩ

1%

C2

4.7µF

10V

C3

4.7µF

10V

C10

0.1µF

R5*

R7*

C11

C12

R6*

R8*

0.1µF

0.1µF

DEL

SRC

DRN

CTL

COM

R9

5kΩ

VGON

+22V/10mA

*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

VMAIN

+8V/250mA

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