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PRODUCT SPECIFICATION
RC2951
9
Typical Applications
(continued)
6V
Lead-Acid
Battery
+
+
+
–
+
–
+
–
RC2951
V
OUT
+V
OUT
= 5V
V
TAP
R
3
+V
IN
GND
FB
SD
SENSE
V
OUT
V
TAP
+V
IN
GND
FB
SD
SENSE
RC2951
8
1
2
7
1
μ
F
6
4
3
RESET
1
μ
F
39k
39k
100k
< 5.8V**
< 6.0V**
< 6.2V**
*Optional Latch off when drop out occurs. Adjust R3 for C2 Switching when V
in
is 6.0V.
**Outputs go low whenV
in
drops below designated thresholds.
For values shown, Regulator shuts down when V
in
< 5.5V and turns on again at 6.0V. Current drain in disconnected mode is
150
μ
A.
*Sets disconnect Voltage
**Sets disconnect Hysteresis
100
k
1%
C1
C1-C4
LP339
+
–
*C4
C2
C3
100k
1k
1%
100k
1k
1.5k
**
1N457
FB
+
–
10k
20k
120k
100k
20
Main V+
Memory V+
400k
*
for 5.5V
1%
1%
2
8
5
3
4
6
7
1
ERROR
Figure 12. Regulator with State-of-Charge Indicator
Figure 13. Low Battery Disconnect
6V
Sealed
Lead-Acid
Battery
Source
Ni-cad
Backup
Battery
+
+
+
LM385
2950-14