LP3982
SNVS185D –FEBRUARY 2002–REVISED APRIL 2013
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TYPICAL PERFORMANCE CHARACTERISTICS
Unless otherwise specified, VIN = VO + 0.5V, CIN = COUT = 2.2 μF, CCC = 33 nF, TJ = 25°C, VSHDN = VIN.
Dropout Voltage vs. Load Current
(For Different Output Voltages)
Dropout Voltage vs. Load Current
(For Different Output Temperatures)
160
140
120
100
80
140
120
100
80
V
= 2.77V
O
25°C
85°C
V
= 2.5V
O
V
= 3.3V
O
-40°C
60
60
40
40
20
0
20
0
50
100
150
200
250
300
50
100 150
200
250 300
0
0
LOAD CURRENT (mA)
LOAD CURRENT (mA)
Figure 2.
Figure 3.
FAULT Detect Threshold vs. Load Current
180
Supply Current vs. Input Voltage
= 0mA
240
220
200
180
160
140
120
100
80
I
L
160
140
FAULT = HIGH
T
A
= 85°C
120
100
80
60
40
20
0
T
= 25°C
A
FAULT = LOW
60
T
= -40°C
A
40
20
0
0
50
100
150
200
250
300
0
2
3
4
5
6
1
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
Figure 4.
Figure 5.
Supply Current vs. Load Current
Power Supply Rejection Ratio vs. Frequency
0
250
200
150
100
50
85°C
-10
-20
-30
-40
-50
-60
-70
25°C
-40°C
0
0
50
100
150
200
250
300
10
10k
100k
100
1k
LOAD CURRENT (mA)
FREQUENCY (Hz)
Figure 6.
Figure 7.
4
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