Datasheet

MAX1818
500mA Low-Dropout
Linear Regulator in SOT23
4 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
IN
= (V
OUT
+ 500mV) or +2.5V, whichever is greater; SHDN = IN, C
IN
= 1µF, C
OUT
= 3.3µF, T
A
= +25°C, unless otherwise noted.)
0
60
30
120
90
150
180
0 0.20.1 0.3 0.4 0.5
MAX1818 toc04
LOAD CURRENT (A)
DROPOUT VOLTAGE (mV)
V
OUT
= 3.3V
DROPOUT VOLTAGE
vs. LOAD CURRENT
T
A
= +85
°
C
T
A
= +25
°
C
T
A
= -40
°
C
-3.0
-2.0
-2.5
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
2.5
3.0
MAX1818 toc05
LOAD CURRENT (A)
OUTPUT VOLTAGE ACCURACY (%)
0 0.2 0.3 0.40.1 0.5 0.6 0.7 0.90.8 1.0
OUTPUT VOLTAGE ACCURACY
vs. LOAD CURRENT
3.3V OUTPUT
2.5V OUTPUT
1.8V OUTPUT
-3.0
-2.0
-2.5
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
2.5
3.0
-40 -15 10 35 60 85
MAX1818 toc06
TEMPERATURE (°C)
OUTPUT VOLTAGE ACCURACY (%)
OUTPUT VOLTAGE ACCURACY
vs. TEMPERATURE
V
OUT
= 1.5V TO 5.0V
I
LOAD
= 150mA
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX1818 toc07
80
0
20
10
PSRR (dB)
40
30
50
60
70
0.01 0.1 1 10 100 1000
FREQUENCY (kHz)
C
OUT
= 3.3
μ
F
V
OUT
= 3.3V
R
LOAD
= 100
Ω
LINE TRANSIENT
MAX1818 toc08
V
IN
V
OUT
2.5V 10mV/div
3.5V
100
μ
s/div
500mV/div
LOAD-TRANSIENT RESPONSE
MAX1818 toc09
I
OUT
V
OUT
500mA
100mA
20mV/div
40
μ
s/div
V
IN
= 3.3V
V
OUT
= 2.5V
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
MAX1818 toc10
V
OUT
100mV/div
200mA
0
I
OUT
10μs/div
V
IN
= V
OUT
+ 100mV
V
OUT
= 3.3V
POWER-ON RESET
MAX1818 toc11
V
IN
V
POK
V
OUT
0
0
0
2V/div
10ms/div