MAX840/MAX843/MAX844
Low-Noise, Regulated, -2V GaAsFET Bias
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Figures 2a and 2c, 2.5V ≤ V
IN
≤ 10V, V
OUT
= -2V, GND = 0V, R
L
= ∞, SHDN = V
IN
, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are measured at V
IN
= 3.6V and T
A
= +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, V
IN
to GND ..................................-0.3V to 10.5V
V
NEGOUT
to GND...................................................-10.5V to 0.3V
V
IN
to V
NEGOUT
.........................................................-0.3V to 21V
V
OUT
to GND (Note 1).......................................V
NEGOUT
to 0.3V
V
SHDN
to GND ............................................-0.3V to (V
IN
+ 0.3V)
Continuous Power Dissipation (T
A
= +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
V
IN
= 3.6V,
R
L
= ∞ or 500Ω
MAX844, V
IN
≤ 3.6V, SHDN = 0V
MAX844, V
IN
= 10V, SHDN = 0V
MAX840/MAX843, V
IN
= 10V, SHDN = 0V
MAX843/MAX844, V
CONT
= 0V
MAX843/MAX844,
V
CTRL
= 2V
MAX840, V
FB
= 0V
MAX840, V
FB
= -0.5V
MAX840, no load
CONDITIONS
mVp-p1V
OUT
Ripple
mV/mA
28
V
OUT
Load Regulation
38
µA
175 300
I
SHUT
Shutdown Supply Current
940
1
nA±1 ±100I
CONT
CONT Leakage Current
nA±1 ±100I
FB
FB Leakage Current
V-0.516 -0.5 -0.484V
FB
FB Voltage
-2.1 -2.0 -1.9
V2.5 10V
IN
Supply Voltage Range
-0.5 to
(V
IN
- 0.6)
V
OUT
Output Voltage Adjust Range
V
-2.05 -2.0 -1.95
V
OUT
Output Voltage
-2.1 -2.0 -1.9
-2.05 -2.0 -1.95
UNITSMIN TYP MAXSYMBOLPARAMETER
80 100 120
Oscillator Frequency F
OSC
V
IN
= 3.6V,
T
A
= +25°C
14 20 26
kHz
Input High Voltage V
IH
SHDN 2.2 V
V
IN
≥ 2.7V,
I
OUT
= 0mA to 4mA
V
IN
≥ 2.5V,
I
OUT
= 0mA to 3mA
V
IN
≥ 2.5V,
I
OUT
= 0mA to 3mA
V
IN
≥ 2.7V,
I
OUT
= 0mA to 4mA
V
MAX840, V
FB
= 0V
MAX843/MAX844,
V
CTRL
= 2V
Input Low Voltage V
IL
SHDN 0.35 V
Input Current I
IN
SHDN -1 1 µA
Input Capacitance C
IN
SHDN 10 pF
MAX840/MAX843/
MAX844
MAX844, SHDN = 0V
No load, V
IN
≤ 3.6VI
Q
Supply Current µA750 1300
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