LP2950 Datasheet, PDF (12/14 Pages) National Semiconductor (TI) – Series of Adjustable Micropower Voltage Regulators

LP2950/2951
+V _IN
8
470k
+V _IN
5
ERROR
470k
VOUT ¹
3
SD
RESET
LP2951
GND
7
FB
4
VOUT
R1
+
1µF
R2
Latch Off When Error Flag Occurs
Micrel
4
20mA
1N
4001
0.1µF
8
VIN
VOUT ¹
MIC2951
7
FB
GND
4
1N457
+5V
4.7mA
OUTPUT*
1
5
4
2
* HIGH FOR
360 ^{IL < 3.5mA}
MIN. VOLTAGE 4V
Open Circuit Detector for 4mA to 20mA Current Loop
8
2
39kΩ
+VIN SENSE
5 _ERROR
VOUT ¹
RESET
LP2951
–
C4
3 _SD
+
FB ⁷
39kΩ ^{GND TAP}
4
6
+VOUT = 5V
+
1µF
+ _6V
LEAD-
1%
100
kΩ
ACID
BATTERY
1%
1
kΩ
C1-C4
LP339
1%
1
kΩ
–
100kΩ
C1
+
<5.8V**
–
100kΩ
C2
+
<6.0V**
–
100kΩ
C3
+
<6.2V**
10kΩ
R3
1% 20kΩ
*OPTIONAL LATCH OFF WHEN DROP OUT OCCURS. ADJUST R3 FOR C2
SWITCHING WHEN V_IN IS 6.0V
**OUTPUTS GO LOW WHEN V_IN DROPS BELOW DESIGNATED THRESHOLDS.
Regulator with State-of-Charge Indicator
3-46
February 1999