LP2950 Datasheet, PDF (10/13 Pages) National Semiconductor (TI) – Series of Adjustable Micropower Voltage Regulators

TYPICAL APPLICATIONS (continued)
+ 6V
SEALED
LEAD-
120kΩ
1.5kΩ
ACID
BATTERY
SOURCE _FB
SPX385
1N457
FOR 5.5 V
400kΩ
100kΩ
Figure 5. Low Battery disconnect
LP2950/LP2951
3
SD
8
+V IN
1
V OUT
LP2951
SENSE
2
GND
4
MAIN V+
+
1µF
MEMORY V+
20kΩ
NI-CAD
BACKUP
BATTERY
39k^Ω ..
RESET
8
5 __+_V_^I_^N_
ERROR
2
SENSE
1
V_OUT
-
LP2951
3
C4
SD
7
+
FB
39k^Ω ..
GND
TAP
4
6
+V_OUT = 5V
+
1uF
1% 100k^Ω ..
-
C1
+
6V
LEAD-
1k^Ω ..
ACID
1%
BATTERY
-
C2
+
100k^Ω ..
100k^Ω ..
<5.8V**
1% _1kΩ _.. ^-
C3
+
10k ^Ω ..
R₃
1% _20k Ω _..
100k^Ω ..
<6.0V**
<6.2V**
* OPTIONAL LATCH OFF WHEN DROPOUT OCCURS. ADJUST R3 FOR C2 SWITCHING WHEN
V_IN IS 6.0V
* OUTPUTS GO LOW WHEN V _IN DROPS BELOW DESGNATED THRESHHOLDS
Figure 6. Regulator with State-of Charge Indicator
Rev. 8/10/01
LP2950/51 100mA Low Dropout Voltage Regulators
10
©Copyright 2001 Sipex Corporation