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MAX843ESA

Low-Noise, Regulated, -2V GaAsFET Bias

Maxim Integrated 

Low-Noise, Regulated, -2V GaAsFET Bias

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, VIN to GND ..................................-0.3V to 10.5V

VNEGOUT to GND ...................................................-10.5V to 0.3V

VIN to VNEGOUT.........................................................-0.3V to 21V

VOUT to GND (Note 1).......................................VNEGOUT to 0.3V

V SHDN to GND ............................................-0.3V to (VIN + 0.3V)

Continuous Power Dissipation (TA = +70°C)

SO (derate 5.88mW/°C above +70°C) .........................471mW

Operating Temperature Ranges

MAX84_I_ _A ...................................................-25°C to +85°C

MAX84_E_ _A ..................................................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10sec) .............................+300°C

Note 1: The output may be shorted to NEGOUT or GND if the package power dissipation is not exceeded. Typical short-circuit

current from 4V to GND is 40mA.

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(Figures 2a and 2c, 2.5V ≤ VIN ≤ 10V, VOUT = -2V, GND = 0V, RL = ∞, SHDN = VIN, TA = TMIN to TMAX, unless otherwise noted.

Typical values are measured at VIN = 3.6V and TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

Supply Voltage Range

VIN

2.5

10

V

Output Voltage

VIN ≥ 2.5V,

IOUT = 0mA to 3mA

-2.1

-2.0

-1.9

MAX840, VFB = 0V

VIN ≥ 2.7V,

IOUT = 0mA to 4mA

-2.1

-2.0

-1.9

VOUT

V

MAX843/MAX844,

VIN ≥ 2.5V,

IOUT = 0mA to 3mA

-2.05 -2.0 -1.95

VCTRL = 2V

VIN ≥ 2.7V,

IOUT = 0mA to 4mA

-2.05 -2.0 -1.95

Output Voltage Adjust Range

VOUT

-0.5 to

(VIN - 0.6)

V

FB Voltage

FB Leakage Current

CONT Leakage Current

Supply Current

Shutdown Supply Current

VOUT Load Regulation

VFB

IFB

ICONT

IQ

ISHUT

MAX840, no load

MAX840, VFB = -0.5V

MAX843/MAX844, VCONT = 0V

No load, VIN ≤ 3.6V

MAX840/MAX843, VIN = 10V, SHDN = 0V

MAX844, VIN = 10V, SHDN = 0V

MAX844, VIN ≤ 3.6V, SHDN = 0V

VIN = 3.6V,

RL = ∞ or 500Ω

MAX840, VFB = 0V

MAX843/MAX844,

VCTRL = 2V

-0.516 -0.5

±1

±1

750

940

175

3

2

-0.484

±100

±100

1300

1

300

8

8

V

nA

nA

µA

µA

mV/mA

VOUT Ripple

C4 = 10µF

1

mVp-p

Oscillator Frequency

Input High Voltage

Input Low Voltage

Input Current

Input Capacitance

FOSC

VIH

VIL

IIN

CIN

VIN = 3.6V,

TA = +25°C

SHDN

SHDN

SHDN

SHDN

MAX840/MAX843/

MAX844

80

MAX844, SHDN = 0V 14

2.2

-1

100

120

kHz

20

26

V

0.35

V

1

µA

10

pF

2 _______________________________________________________________________________________

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