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MAX840/MAX843/MAX844

Low-Noise, Regulated, -2V GaAsFET Bias

_______________________________________________________________________________________

-2.040

010

OUTPUT VOLTAGE 

vs. OUTPUT CURRENT

-2.050

MAX840-01

OUTPUT CURRENT (mA)

OUTPUT VOLTAGE (V)

-2.070

-2.060

24 8

13579

-2.040

OUTPUT VOLTAGE vs. INPUT VOLTAGE

OVER TEMPERATURE

-2.050

-2.045

MAX840-02

INPUT VOLTAGE (V)

OUTPUT VOLTAGE (V)

-2.065

-2.060

-2.055

10624 83579

= +85°C

= +25°C

= -40°C

MAXIMUM OUTPUT CURRENT 

vs. INPUT VOLTAGE

MAX840-03

INPUT VOLTAGE (V)

MAXIMUM OUTPUT CURRENT (mA)

120

100

24 83579

OUT

< -1.95V

(CIRCUIT OF FIG 2a)

OUT

< -1.95V

(CIRCUIT OF FIG 2d)

OUT

< 2mVp-p RIPPLE

(CIRCUIT OF FIG 2d)

OUT

< 2mVp-p RIPPLE

(CIRCUIT OF FIG 2a)

High-current operation not

recommended for extended

periods of time.

N0-LOAD SUPPLY CURRENT

vs. INPUT VOLTAGE

MAX840-05

INPUT VOLTAGE (V)

NO-LOAD SUPPLY CURRENT (mA)

24 83579

NEGOUT CURRENT vs. INPUT VOLTAGE

MAX840-04

INPUT VOLTAGE (V)

NEGOUT CURRENT (mA)

24 83579

NEGOUT

= 0.9 x V

NEGOUT(NO LOAD)

SHUTDOWN

(MAX844)

SUPPLY CURRENT vs. TEMPERATURE

MAX840-06

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

-40 0 80-20 20 60 100

= 10V

= 3.6V

0.4

START-UP TIME vs. INPUT VOLTAGE

1.6

1.2

0.8

MAX840-07

INPUT VOLTAGE (V)

START-UP TIME (ms)

2.8

2.4

2.0

24 8357910

__________________________________________Typical Operating Characteristics

(Circuit of Figure 2a, V

= 3.6V, T

= +25°C, unless otherwise noted.)

1 2 3 4 5 6 7 8 9 10

MAX840/MAX843/MAX844 1

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