LP2950

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...