SUPPLY CURRENT (mA) LT1120 Micropower Regulator with Comparator and Shutdown FEATURES DESCRIPTIO 40A Supply Current The LT 1120 is a combination micropower positive regu- 125mA Output Current lator and free collector comparator on a single monolithic 2.5V Reference Voltage chip. With only 40A supply current, the LT1120 can Reference Output Sources 2mA and Sinks 2mA supply over 125mA of output current. Input voltage range Open Collector Comparator Sinks 10mA is from 4.5V to 36V and dropout voltage is 0.6V at 125mA. Logic Shutdown Dropout voltage decreases with lower load currents. Also 0.2V Dropout Voltage included on the chip is a class B output 2.5V reference that Thermal Limiting can either source or sink current. A shutdown pin allows Available in 8-Lead DIP and SO Packages logic shutdown of the output. U The comparator can be used for system or battery moni- APPLICATIO S toring. For example, the comparator can be used to warn of low system voltage. Frequency compensation of the Battery Systems comparator for amplifier applications can be obtained by Battery-Backup System adding external output capacitance. Portable Terminals The 2.5V reference will source or sink current. This allows Portable Instruments it to be used as a supply splitter or auxiliary output. Memory Keep-Alive , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATIO Dropout Voltage and Supply Current 1.00 10 5V Regulator 5 4 V > 5.2V IN V V 5V IN OUT I = 40A Q 0.001F1M LT1120 0.10 1 + + 2 10F FB 25F SHDN GND 1M 3 1 SHUTDOWN 1120 TA01 0.01 0.1 0.1 1 10 100 1000 OUTPUT CURRENT (mA) 1120 TA02 1120fd 1 DROPOUT VOLTAGE (V) U ULT1120 ABSOLUTE AXI U RATI GS (Note 1) Input Voltage ........................................................... 36V Operating Temperature Range NPN Collector Voltage ............................................. 36V LT1120C ................................................ 0C to 100C Output Short-Circuit Duration .......................... Indefinite LT1120I ................................................ 40 to 100C Power Dissipation............................... Internally Limited Storage Temperature Range ................. 65C to 150C UUW PACKAGE/ORDER I FOR ATIO ORDER PART ORDER PART TOP VIEW TOP VIEW NUMBER NUMBER INPUT GND 1 8 INPUT LT1120CN8 8 LT1120CH GND 1 7 COMPOUT FB 2 7 COMPOUT LT1120CS8 SHDN 3 6 REF LT1120IN8 FB 2 6 REF V 4 V 5 OUT IN LT1120IS8 SHDN 3 5 V IN S8 PACKAGE 4 N8 PACKAGE S8 PART MARKING 8-LEAD PLASTIC SO 8-LEAD PDIP V OUT T = 110C, = 130C/W (N) JMAX JA H PACKAGE 1120 T = 110C, = 150C/W (S) JMAX JA 8-LEAD TO-5 METAL CAN 1120I T = 150C, = 150C/W, = 45C/W JMAX JA JC ORDER PART J8 PACKAGE NUMBER 8-LEAD CERDIP T = 150C, = 100C/W (J) JMAX JA LT1120CJ8 OBSOLETE PACKAGES Consider the N8 and S8 Packages for Alternate Source Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25C. T = 25C. A 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 2mA I 2mA, V = 12V 0.3 0.6 % REF IN Output Source Current V = 5V 2 4 mA IN Output Sink Current V = 5V 2 4 mA IN Temperature Stability 1% Regulator Supply Current V = 6V, I 100A4580 A IN OUT V = 36V, I 100 A 75 100 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 = 100A 0.02 0.05 V OUT I = 125mA 0.4 0.65 V OUT 1120fd 2 U WWW