rc2951mt Fairchild Semiconductor, rc2951mt Datasheet - Page 9

• Manufacturer Part Number: rc2951mt
• Description: Adjustable Micropower Voltage Regulator
• Manufacturer: Fairchild Semiconductor

PRODUCT SPECIFICATION
Typical Applications
REV. 1.0.1 4/8/02
For values shown, Regulator shuts down when V
*Optional Latch off when drop out occurs. Adjust R3 for C2 Switching when V
**Outputs go low whenV
**Sets disconnect Hysteresis
*Sets disconnect Voltage
+
≈ 400kΩ*
for 5.5V
in
6V
Sealed
Lead-Acid
Battery
Source
drops below designated thresholds.
Figure 12. Regulator with State-of-Charge Indicator
(continued)
+
120kΩ
FB
6V
Lead-Acid
Battery
C1-C4
LP339
in
< 5.5V and turns on again at 6.0V. Current drain in disconnected mode is ≈ 150 µA.
LM385
39kΩ
Figure 13. Low Battery Disconnect
–
+
*C4
+
–
100kΩ
1.5kΩ**
RESET
1%
1%
1%
1%
R
3
10kΩ
20kΩ
39kΩ
100
kΩ
1kΩ
1kΩ
1N457
3
5
3
SD
ERROR
+V
GND
SD
in
–
+
–
+
–
+
C1
C2
C3
is 6.0V.
IN
RC2951
GND
8
4
SENSE
RC2951
4
+V
V
TAP
V
IN
OUT
6
8
2
FB
SENSE
V
TAP
V
100kΩ
6
100kΩ
100kΩ
OUT
1
FB
7
1
2
7
+V
< 5.8V**
< 6.0V**
< 6.2V**
1µF
OUT
+
= 5V
+
1µF
+
Main V+
Memory V+
20Ω
Ni-cad
Backup
Battery
2950-14
RC2951
9