LP2950 Datasheet, PDF (13/14 Pages) National Semiconductor (TI) – Series of Adjustable Micropower Voltage Regulators

LP2950/2951
Micrel
+ _6V
SEALED
120kΩ
1.5kΩ** _1N457
LEAD-
ACID
BATTERY
FB
SOURCE
LM385
–
≈ 400kΩ*
FOR 5.5V
100kΩ
3 _SD
* Sets disconnect voltage
** Sets disconnect hysteresis
8
+VIN
VOUT ¹
LP2951
SENSE ²
GND
4
1µF+
MAIN V+
MEMORY V+
20Ω
+ _NI-CAD
BACKUP
BATTERY
Low Battery Disconnect
For values shown, Regulator shuts down when V_IN < 5.5 V and turns on again at 6.0 V. Current drain in disconnected mode is 150µA.
+VIN
8
+VIN
10kΩ
AUX. SHUTDOWN
INPUT
3 _SD
ERROR ^{5 5° PRE-SHUTDOWN FLAG}
3
OFF
MIC2951
ON
VOUT ¹
+
TEMP. LM34 OR
SENSOR LM35
–
GND
4
FB
7
8.2kΩ
EXTERNAL CIRCUIT
PROTECTED FROM
OVER TEMPERATURE
OR
(V+ GOES OFF WHEN
TEMP.> 125°)
RELAY
LM34 for 125°F Shutdown
LM35 for 125°C Shutdown
System Over Temperature Protection Circuit
February 1999
3-47