MAX1748 查看數據表（PDF） - Maxim Integrated

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MAX1748

Triple-Output TFT-LCD DC-DC Converters

Maxim Integrated 

Triple-Output TFT-LCD

DC-DC Converters

SUPN

VSUPN = 2.7V TO 13V

OSC

D4

C5

DRVN

D5

+

-

MAX1748

MAX8726 GND

FBN

- VREF

+ 1.25V

REF

PGND

Figure 2. Negative Charge-Pump Block Diagram

R5

R6

VNEG

C6

CREF

0.22μF

VPOS = (R5 / R6) x VREF

VREF = 1.25V

SUPP

VSUPP = 2.7V TO 13V

OSC

D2

C3

DRVP

D3

-

FBP

+

+ VREF

- 1.25V

MAX1748

MAX8726

GND

PGND

Figure 3. Positive Charge-Pump Block Diagram

R3

R4

VPOS

C4

VPOS = [1 + (R3 / R4)] x VREF

VREF = 1.25V

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