LP2950 LP2951
TYPICAL APPLICATIONS
Figure 18. Lithium Ion Battery Cell Charger
Figure 19. Low Drift Current Sink
+V = 2.0 to 30 V
Unregulated Input
6.0 to 10 Vdc
I
L
I
= 1.23/R
Load
L
8
V
1N4001
330 pF
4.2 V ± 0.025 V
in
1
2
5
Error
V
NC
out
8
0.1 µF
2.0 M
1.0%
NC
NC
SNS
V
in
1
Error
Output
5
3
LP2951CN
V
0.1 µF
Error
out
3
6
SD
V
T
O
2
6
SNS
806 k
1.0%
Lithium Ion
Rechargeable
Cell
Gnd
4
FB
2.2
µF
LP2951CN
Shutdown
Input
7
SD
V
T
O
50 k
Gnd
4
FB
7
Gnd
1.0 µF
R
Figure 20. Latch Off When Error Flag Occurs
Figure 21. 5.0 V Regulator with 2.5 V Sleep Function
+V
in
+V
in
CMOS
Gate
*Sleep
Input
8
470 k
470 k
V
8
in
47 k
Error
1
2
5
3
V
V
out
Error
out
V
2N3906
V
2N3906
out
in
1
2
470 k
5
V
out
Error
Output
NC
NC
SNS
LP2951CN
Reset
NC
NC
SNS
200 k
100 k
6
LP2951CN
R1
R2
SD
V
T
O
Shutdown
Input
3
6
3.3 µF
Normally
Closed
SD
V
T
O
Gnd
4
FB
1.0 µF
100 pF
7
Gnd
4
FB
7
100 k
Error flag occurs when V is too low to
in
maintain V , or if V
out out
excessive load current.
is reduced by
10
MOTOROLA ANALOG IC DEVICE DATA
MOTOROLA [ MOTOROLA ]
