Datasheet

MAX1982/MAX1983
Low-Voltage, Low-Dropout Linear Regulators
with External Bias Supply
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(Circuit of Figure 3, T
A
= +25°C, unless otherwise noted.)
POWER-SUPPLY REJECTION RATIO (V
BIAS
)
vs. FREQUENCY
MAX1982/83 toc12
FREQUENCY (Hz)
PSRR (dB)
100k10k1k100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-100
10 1M
V
BIAS
= 5V
V
P-P
= 0.6V
I
LOAD
= 0
RIPPLE REJECTION RATIO (V
IN
)
vs. FREQUENCY
MAX1982/83 toc13
FREQUENCY (Hz)
PSRR (dB)
100k10k1k100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-100
10 1M
V
IN
= 3V
V
P-P
= 0.4V
I
L
= 300mA
I
L
= 200mA
I
L
= 100mA
LINE TRANSIENT (NO LOAD)
MAX1982/83 toc14
100μs/div
2.4V
1.8V
1mV/div
V
OUT
V
IN
500mV/
div
1mV/
div
LOAD TRANSIENT (1mA TO 300mA)
MAX1982/83 toc15
10μs/div
300mA
I
LOAD
V
OUT
200mA/
div
10mV/
div
LOAD TRANSIENT (300mA TO 1mA)
MAX1982/83 toc16
10μs/div
300mA
I
LOAD
V
OUT
200mA/
div
10mV/
div
LOAD TRANSIENT IN DROPOUT
MAX1982/83 toc17
20μs/div
300mA
I
LOAD
V
OUT
200mA/
div
50mV/
div