LP2950, LP2951, NCV2951
TYPICAL APPLICATIONS
+V = 2.0 to 30 V
I
L
I = 1.23/R
L
Load
Unregulated Input
6.0 to 10 Vdc
8
0.1 mF
8
V
in
1
2
Error
Output
V
5
3
1N4001
330 pF
4.2 V ꢀ0.025 V
in
V
1
2
out
Error
5
Error
V
NC
out
SNS
LP2951CN
SD
2.0 M
1.0%
NC
NC
SNS
LP2951CN
0.1 mF
Shutdown
Input
6
3
6
V
O
T
SD
V
T
O
806 k
1.0%
GND FB
4
Lithium Ion
Rechargeable
Cell
GND FB
4
2.2 mF
7
7
50 k
1.0 mF
R
GND
Figure 21. Lithium Ion Battery Cell Charger
Figure 22. Low Drift Current Sink
+V
in
+V
in
CMOS
Gate
*Sleep
Input
8
470 k
V
in
1
2
5
3
V
V
out
out
Error
2N3906
470 k
470 k
Reset
8
47 k
Error
V
out
V
2N3906
NC
NC
in
SNS
LP2951CN
1
2
5
V
out
Error
Output
6
R1
R2
SD
V T
O
NC
NC
SNS
LP2951CN
200 k
100 k
Normally
Closed
GND FB
4
1.0 mF
Shutdown
Input
3
6
3.3 mF
SD
V T
O
7
100 pF
GND FB
4
7
Error flag occurs when V is too
in
100 k
low to maintain V , or if V is re-
out
out
duced by excessive load current.
Figure 23. Latch Off When Error Flag Occurs
Figure 24. 5.0 V Regulator with 2.5 V Sleep Function
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