MAX844CSLASHD datasheet(2/10 Pages) MAXIM

2 / 10 page

Low-Noise, Regulated, -2V GaAsFET Bias

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ABSOLUTE MAXIMUM RATINGS

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.)

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.

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.

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

C4 = 10µF

VIN = 3.6V,

RL = ∞ or 500Ω

MAX844, VIN ≤ 3.6V, SHDN = 0V

MAX844, VIN = 10V, SHDN = 0V

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

MAX843/MAX844, VCONT = 0V

MAX843/MAX844,

VCTRL = 2V

MAX840, VFB = 0V

MAX840, VFB = -0.5V

MAX840, no load

CONDITIONS

mVp-p

VOUT Ripple

mV/mA

VOUT Load Regulation

µA

175

300

ISHUT

Shutdown Supply Current

940

±1

±100

ICONT

CONT Leakage Current

±1

±100

IFB

FB Leakage Current

-0.516

-0.5

-0.484

VFB

FB Voltage

-2.1

-2.0

-1.9

2.5

VIN

Supply Voltage Range

-0.5 to

(VIN - 0.6)

VOUT

Output Voltage Adjust Range

-2.05

-2.0

-1.95

VOUT

Output Voltage

-2.1

-2.0

-1.9

-2.05

-2.0

-1.95

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

100

120

Oscillator Frequency

FOSC

VIN = 3.6V,

TA = +25°C

kHz

Input High Voltage

VIH

SHDN

2.2

VIN ≥ 2.7V,

IOUT = 0mA to 4mA

VIN ≥ 2.5V,

IOUT = 0mA to 3mA

VIN ≥ 2.5V,

IOUT = 0mA to 3mA

VIN ≥ 2.7V,

IOUT = 0mA to 4mA

MAX840, VFB = 0V

MAX843/MAX844,

VCTRL = 2V

Input Low Voltage

VIL

SHDN

0.35

Input Current

IIN

SHDN

-1

µA

Input Capacitance

CIN

SHDN

MAX840/MAX843/

MAX844

MAX844, SHDN = 0V

No load, VIN ≤ 3.6V

Supply Current

µA

750

1300

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