SUPPLY CURRENT (mA) LT1020 Micropower Regulator and Comparator FEATURES DESCRIPTIO n Input Voltage Range: 4.5V to 36V The LT 1020 is a combination micropower positive regu- n 40m A Supply Current lator and free collector comparator on a single monolithic n 125mA Output Current chip. With only 40m A supply current, the LT1020 can n 2.5V Reference Voltage supply over 125mA of output current. Input voltage range n Reference Output Sources 1mA and Sinks 0.5mA is from 4.5V to 36V and dropout voltage is 0.6V at 125mA. n Dual Output Comparator Dropout voltage decreases with lower load currents. Also n Comparator Sinks 10mA included on the chip is a class B output 2.5V reference that n Dropout Detector can either source or sink current. A dropout detector n 0.2V Dropout Voltage provides an output current to indicate when the regulator n Thermal Limiting is about to drop out of regulation. n Available in SO Package The dual output comparator can be used as a comparator for system or battery monitoring. For example, the com- U parator can be used to warn of low system voltage while APPLICATIO S the dropout detector shuts down the system to prevent n Battery Systems abnormal operation. Frequency compensation of the com- n Battery Backup Systems parator for amplifier applications can be obtained by n Portable Terminals adding external output capacitance. Dual output or posi- n Portable Instruments tive and negative regulators can also be made. The 2.5V reference will source or sink current. This allows it to be used as a supply splitter or auxiliary output. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO 5V Regulator Dropout Voltage and Supply Current 1 10 3 2 V > 5.2V IN V V 5V IN OUT I = 40m A Q 0.001m F LT1020 1M + + 11 FB 10m F 10m F GND 9 1M 0.1 1 1020 TA01 0.01 0.1 0.1 1 10 100 1000 OUTPUT CURRENT (mA) 1020 TA02 sn1020 1020fcs 1 DROPOUT VOLTAGE (V) U ULT1020 (Note 1) ABSOLUTEXAI U RATI GS Input Voltage .......................................................... 36V Operating Temperature Range NPN Collector Voltage ............................................ 36V LT1020C............................................. 0 C to 100 C PNP Collector Voltage ............................. Supply 36V LT1020I ........................................ 40 C to 100 C Output Short Circuit Duration ......................... Indefinite LT1020M (OBSOLETE) .................. 55 C to 125 C Power Dissipation.............................. Internally Limited Lead Temperature (Soldering, 10 sec).................. 300 C Storage Temperature Range ................ 65 C to 150 C / PACKAGE ORDER I FOR ATIO TOP VIEW ORDER PART ORDER PART NUMBER NUMBER 1 14 NC NC TOP VIEW DROPOUT 2 13 V OUT DETECTOR LT1020CN LT1020CSW NC 1 16 NC 3 12 SHUTDOWN V IN DROPOUT LT1020IN LT1020ISW V 2 15 OUT 4 11 FEEDBACK REF OUT DETECTOR CURRENT VI 3 14 SHUTDOWN N 5 10 COMP PNP LIMIT REF OUT 4 13 FEEDBACK 6 9 GND COMP NPN CURRENT COMP PNP 5 12 7 8 INPUT +INPUT LIMIT COMP NPN 6 11 GND N PACKAGE +INPUT 7 10 INPUT 14-LEAD PDIP T = 110 C, q = 130 C/W NC 8 9 JMAX JA NC J PACKAGE 14-LEAD CERDIP LT1020CJ SW PACKAGE T = 150 C, q = 80 C/W JMAX JA 16-LEAD PLASTIC (WIDE) SO LT1020IJ T = 110 C, q = 150 C/W JMAX JA LT1020MJ OBSOLETE PACKAGE Consider the N14 Package for Alternate Source Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS T = 25 C J PARAMETER CONDITIONS MIN TYP MAX UNITS Reference Reference Voltage 4.5V V 36V 2.46 2.50 2.54 V IN Line Regulation 4.5V V 36V 0.01 0.015 %/V IN Load Regulation 0.5mA I 1mA, V = 12V 0.2 0.3 % REF IN Output Source Current V = 5V 1 4 mA IN Output Sink Current V = 5V 0.5 2 mA IN Temperature Stability 1% Regulator Supply Current V = 6V, I 100mA4580 m A IN OUT V = 36V, I 100m A 75 120 m A IN OUT V = 12V, I = 125mA 11 20 mA IN OUT Output Current (V V ) 1V, V 6V 125 mA IN OUT IN Load Regulation (V V ) 1V, V 6V 0.2 0.5 % IN OUT IN Line Regulation 6V V 36V 0.01 0.015 %/V IN Dropout Voltage I = 100m A 0.02 0.05 V OUT I = 125mA 0.4 0.65 V OUT sn1020 1020fcs 2 U WU U W W W