Rainbow-electronics MAX1885 Manual do Utilizador descarregar pdf (Página 35)

the Typical Operating Characteristics. Set the resistive

divider to precharge BUFOUT, matching the buffer’s

output set voltage:

These resistor values are selected to charge the output

capacitor close to the output set voltage before the

buffer starts up:

CRR

BUFOUT

OSC

(||) 34

5000

≈

SUPB

BUFOUT

34 1 =













−













MAX1778/MAX1880–MAX1885

Quad-Output TFT LCD DC-DC

Converters with Buffer

______________________________________________________________________________________ 35

PART

STEP-UP

SWITCHING

FREQUENCY

(Hz)

DUAL

CHARGE

PUMPS

LINEAR

REGULATOR

MAX1778 1M Yes Yes

MAX1880 1M Yes No

MAX1881 500k Yes Yes

MAX1882 500k Yes No

MAX1883 1M No Yes

MAX1884 500k No Yes

MAX1885 500k No No

Selector Guide

BUFFER OUTPUT

BUFOUT

= V

SUPB

SHDN

SUPB

6.8µH

INPUT

= 3.3V

0.22µF

OUT

(2) 4.7µF

4.7µF

274kΩ

49.9kΩ

BUFOUT

GND

BUF+

BUF-

REF

INTG

PGND

REF

0.22µF

MAX1778

SUPB

1.0µF

BUF

1.0µF

10kΩ

MAIN

= 8V

R3 = R4

[(

)

-1

]

SUPB

BUFOUT

Figure 11. VCOM Buffer Soft-Start;

1 2 ... 30 31 32 33 34 35 36 37 38

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Rainbow-electronics MAX1885 Manual do Utilizador Página 35

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