Datasheet

MAX1982/MAX1983
Low-Voltage, Low-Dropout Linear Regulators
with External Bias Supply
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 3, V
IN
= 1.8V, I
LOAD
= 1mA, C
LOAD
= 10µF, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 3, V
IN
= 1.8V, I
LOAD
= 1mA, C
LOAD
= 10µF, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
SYM B O L
CONDITIONS
MIN TYP MAX UNITS
LOGIC AND I/O
SHDN Input High Voltage V
IH
2.4 V
SHDN Input Low Voltage V
IL
0.8 V
SHDN Input Current -1 +1 µA
PGOOD Output Low Voltage PGOOD sinking 1mA 0.1 V
PGOOD Output
High Leakage Current
0 < V
PGOOD
< V
IN
-1 +1 µA
DYNAMICS
Positive Load Step t
RISE
I
LOAD
= 1mA to full load, C
LOAD
= 10µF 10 µs
Negative Load Step t
FALL
I
LOAD
= full load to 1mA, C
LOAD
= 10µF 50 µs
Ripple Rejection at V
IN
10Hz < f < 10kHz, I
LOAD
= 300mA,
C
LOAD
= 10µF
-60 dB
Startup Response Time t
ON
I
LOAD
= 300mA, C
LOAD
= 10µF, 0% to 90%
of nominal output voltage
100
µs
Startup Overshoot I
LOAD
= 300mA, C
LOAD
= 10µF 0.5 %
Falling edge, 3mV under trip threshold 10 µs
PGOOD Propagation Delay t
PD
Rising edge within 5% of regulation level 1 4 ms
PARAMETER
SYM B O L
CONDITIONS
MIN MAX
UNITS
Input Voltage V
IN
1.25
5.5 V
BIAS Voltage V
BIAS
4.5 5.5 V
V
OUT
Voltage Range V
OUT
MAX1983 0.8 2.0 V
BIAS Input Undervoltage Lockout
3.8 4.2 V
Shutdown Supply Current I
IN
1.25V < V
IN
< 5.5V 5 µA
Quiescent BIAS Current I
Q
4.5V < V
BIAS
< 5.5V 250 µA
Shutdown BIAS Current I
SHDN
4.5V < V
BIAS
< 5.5V 5 µA
MAX1982: V
IN
= open, V
OUT
= 1.20V
30
V
OUT
Input Bias Current
MAX1983: V
IN
= open, 0.8V < V
OUT
< 2.0V
2
µA
REGULATOR CHARACTERISTICS
Line Regulation
ΔV
OUT
/
ΔV
IN
I
LOAD
= 10mA, 1.5V < V
IN
< 5.5V
-0.15 +0.15
%/V
MAX1982 1.20V
Output Voltage Accuracy
V
OUT
I
OUT
= 1mA to 300mA,
V
OUT
+ 0.5V < V
IN
< 5.5V
-3 +3 %