LP2950/2951
Micrel
LP2950/2951
100mA Low-Dropout Voltage Regulator
General Description
Features
The LP2950 and LP295...
LP2950/2951
Micrel
LP2950/2951
100mA Low-Dropout Voltage
Regulator
General Description
Features
The LP2950 and LP2951 are micropower voltage
regulators with very low dropout voltage (typically 40mV at light loads and 380mV at 100mA), and very low quiescent current (75µA typical). The quiescent current of the LP2950/LP2951 increases only slightly in dropout, thus prolonging battery life. This feature, among others, makes the LP2950 and LP2951 ideally suited for use in battery-powered systems.
Available in a 3-Pin TO-92 package, the LP2950 is pincompatible with the older 5V
regulators. Additional system functions, such as programmable output voltage and logiccontrolled shutdown, are available in the 8-pin DIP and 8-pin SOIC versions of the LP2951.
Applications
Automotive Electronics Voltage Reference
Avionics
High accuracy 5V, guaranteed 100 mA output Extremely low quiescent current Low-dropout voltage Extremely tight load and line regulation Very low temperature coefficient Use as
regulator or reference Needs only 1µF for stability Current and thermal limiting
LP2951 Versions Only
Error flag warns of output dropout Logic-controlled electronic shutdown Output programmable from 1.24 to 29V
Block Diagram and Pin Configurations
UNREGULATED DC
+ 78
FEEDBACK
INPUT
1 OUTPUT
FROM CMOS OR TTL
3
SHUTDOWN
60 mV +
1.23 V + REF.
+
– ERROR AMPLIFIER
+
182 kΩ
60 kΩ
– ERROR DETECTION
COMPARATOR
5V 150 mA
MAX.
2 SENSE
6 5V TAP
5 ERROR
4 GROUND
+ 1...