MAX881R
Low-Noise Bias Supply in µMAX
with Power-OK for GaAsFET PA
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 3, V
IN
= +3.6V, FB = GND, R
L
= ∞, SHDN = IN, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 2)
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.
IN to GND .................................................................-0.3V to +6V
SHDN to GND...........................................................-0.3V to +6V
POK to GND ...........................................................-0.3V to +12V
C1+ to GND.................................................-0.3V to (V
IN
+ 0.3V)
C1-, NEGOUT, OUT, FB to GND ....................-6V to (V
IN
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10s) .................................+300°C
V
IN
= 3V, R
L
= 500Ω, V
SHDN
= 0 to V
IN
,
POK goes low
V
IN
≥ 2.5V, I
OUT
= 0 to 4mA
Connected to IN or GND
V
IN
= 2.5V
V
IN
≥ 2.7V, I
OUT
= 0 to 4mA
V
IN
= 5.5V
V
POK
= 11V
I
OUT
= 4mA, circuit of Figure 3b
V
IN
≥ 2.7V, I
OUT
= 0 to 4mA
V
IN
≥ 2.5V, sinking 1mA
SHDN = GND
V
FB
= -0.5V
FB = OUT
CONDITIONS
ms1t
START
Startup Time
pF10C
IN
SHDN Input Capacitance
µA±1I
SHDN
SHDN Input Current
V0.35V
IL
SHDN Input Low Voltage
V2.2V
IH
SHDN Input High Voltage
µA1
POK Off Leakage Current
mV100
POK Output Level
% of
V
OUT
90 92.5 95
POK Threshold
kHz80 100 120f
OSC
Oscillator Frequency
V-(V
IN
- 0.6) -0.5V
OUT
Adjustable Output Voltage
Range
V-2.1 -2.0 -1.9V
OUT
V2.5 5.5V
IN
Supply Voltage Range
Preset Output Voltage
mVp-p1Output Ripple
mV/mA26Output Load Regulation
µA0.05 1I
SHUT
Shutdown Supply Current
V
-0.515 -0.5 -0.485
V
FB
FB Voltage
nA-10 -100FB Input Current
µA500 950I
Q
Supply Current (Note 3)
UNITSMIN TYP MAXSYMBOLPARAMETER
Note 1: The output may be shorted to NEGOUT or GND if the package power dissipation is not exceeded. Typical short-circuit
current is 35mA.
-0.525 -0.475
-0.535 -0.465
V
IN
≥ 2.5V,
I
OUT
= 0 to 4mA
T
A
= +25°C
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
Note 2: Specifications to -40°C are guaranteed by design, not production tested.
Note 3: MAX881R may draw high supply current during startup, up to the minimum operating supply voltage. To guarantee proper
startup, the input supply must be capable of delivering 90mA more than the maximum load current.
