LP2950
Figure 5. Dropout Voltage versus
Output Current
Figure 6. Dropout Voltage versus Temperature
400
350
550
500
450
400
350
300
55
50
45
40
35
30
T = 25°C
A
300
250
200
150
100
50
R = 50
L
R = 50 k
L
0
0.1
1.0
10
100
– 50
0
50
T, TEMPERATURE (°C)
100
150
I , OUTPUT CURRENT (mA)
O
Figure 7. Error Comparator Output
Figure 8. Line Transient Response
5.0
4.0
3.0
2.0
1.0
0
4.0
8.0
7.5
7.0
6.5
6.0
5.5
V
in
LP2951C
R = 330 k
T = 25°C
A
L
2.0
V Decreasing
in
0
V
out
V Increasing
in
– 2.0
– 4.0
– 6.0
T = 25°C
C = 1.0 µF
I = 1.0 mA
V = 5.0 V
A
L
L
O
4.70
4.74
4.78
4.82
4.86
4.90
0
100
200
300
400
500
600
700
800
V , INPUT VOLTAGE (V)
in
t, TIME (µs)
Figure 9. LP2951 Enable Transient
Figure 10. Load Transient Response
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
200
150
100
50
C = 1.0 µF
L
C = 1.0 µF
L
400
200
0
V
= 5.0 V
out
T = 25°C
A
V
out
C = 10 µF
L
T = 25°C
A
I = 10 mA
L
– 200
– 400
V = 8.0 V
in
out
I
Load
V
= 5.0 V
0
Shutdown Input
–1.0
–100
– 50
0
100
200
300
400
0
50
100
150
200
250
300
350
400
t, TIME (µs)
t, TIME (ms)
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