Rainbow-electronics MAX758A Manual do Utilizador descarregar pdf (Página 9)

saturation region. When shut down, the input voltage

exceeds the emitter voltage so the inactive transistor

provides high-impedance isolation between the input

and output. Efficiency will be slightly degraded due to

the PNP transistor saturation voltage and base current.

0.8V TO

OUT

NEG

-19V

2.4V TO

5.5V

D3**

D2*

D1*

240k

16.5k

OFF

SHDN

LIM

GND

MAX1605

10µH

0.1µF

0.01µF

1000pF

1µF

1Ω

1µF

*D1, D2 =

CENTRAL SEMICONDUCTOR

CMPD7000 DUAL

**D3 =

CENTRAL SEMICONDUCTOR

CMSD4448 (1N4148)

Figure 4. Negative Voltage for LCD Bias

MAX1605

28V Internal Switch LCD Bias Supply

in SOT23

_______________________________________________________________________________________ 9

= 0.8V TO V

OUT

R3 = 180k

= 2.4V TO 5.5V

OUT

= 18V

OFF

SHDN

2N2907A

SET

= 18.3V

OUT

+0.3V)

LIM

GND

MAX1605

10µH

Figure 5. Output Disconnected in Shutdown

Chip Information

TRANSISTOR COUNT: 2329

1 2 3 4 5 6 7 8 9 10 11 12

TOP VIEW 1
ABSOLUTE MAXIMUM RATINGS 2
ELECTRICAL CHARACTERISTICS 2
OUT(NOM) 5
Pin Description 6
Detailed Description 6
Shutdown ( 7
Applications Information 8
Design Procedure 8
Chip Information 9
Package Information 10

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