LTC1841/LTC1842/LTC1843 Ultralow Power Dual Comparators with Reference FEATURES DESCRIPTION n Ultralow Quiescent Current: 3.5A Typ The LTC 1841/LTC1842/LTC1843 are ultralow power dual n Open-Drain Outputs Typically Sink comparators with built-in reference (LTC1842/LTC1843). Greater Than 20mA The comparators feature less than 5.7A supply current n Wide Supply Range: (LTC1841) over temperature, a 1.182V 1% reference, program- Single: 2V to 11V mable hysteresis and open-drain outputs that sink cur- Dual: 1V to 5.5V rent. The reference output can drive a bypass capacitor of n Input Voltage Range Includes the Negative Supply up to 0.01F without oscillation. n Reference Output Drives 0.01F Capacitor The LTC1841 operates from a single 2V to 11V supply or n Adjustable Hysteresis a dual 1V to 5.5V supply. The LTC1842/LTC1843 n 12s Propagation Delay with 10mV Overdrive operate from a single 2.5V to 11V supply or a dual 1.25V n No Current Spike When Switching to 5.5V supply. The LTC1842/LTC1843 hysteresis is easily programmed by using two resistors and the HYST U APPLICATIONS pin. The comparators input operates from the negative supply to within 1.3V of the positive supply. The compara- n Battery-Powered System Monitoring tors output stage can typically sink greater than 20mA. By n Threshold Detectors eliminating the cross-conduction current that normally n Window Comparators happens when the comparators change logic states, power n Oscillator Circuits supply glitches are eliminated. The LTC1841/LTC1842/LTC1843 are available in SO-8 , LTC and LT are registered trademarks of Linear Technology Corporation. packages. TYPICAL APPLICATION Single Li-Ion Cell to 5V Supply LTC1843 Supply Current vs Supply Voltage 1-CELL + L1 R6 C1 Li-Ion D1 10H 25k 100F BATTERY 5 7 T = 25C A R1 67 V CC LTC1843 OUTPUT 1.5M V SW 4 IN B IN 5V 4 LT1302-5 Si9924DY 600mA OUT B 8 3 SHDN I T 8 4 + PGND SENSE R2 3 + 100k C2 V GND C 100F 2 1 + 2 3 IN A R C R7 + 20k 500k OUT A 1 R3 C C 1 1M 0.0F 6 REF LBO 1841/43 TA01 0 C1, C2: SANYO OS-CON R4 0 2 4 6 8 10 12 V HYST 20k D1: MOTOROLA MBRS130LT3 SUPPLY VOLTAGE (V) L1: COILTRONICS CTX10-3 R5 25 1841/43 TA02 1.1M 1 SUPPLY CURRENT (A) U ULTC1841/LTC1842/LTC1843 ABSOLUTE MAXIMUM RATINGS (Note 1) + OUT Short-Circuit Duration (V 5.5V) ...... Continuous Voltage + Power Dissipation............................................. 500mW V to V ................................................12V to 0.3V + + IN , IN , HYST ................. (V + 0.3V) to (V 0.3V) Operating Temperature Range + LTC1841C/LTC1842C/LTC1843C ........... 0C to 70C REF ................................... (V + 0.3V) to (V 0.3V) LTC1841I/LTC1842I/LTC1843I .......... 40C to 85C OUT ................................................ 12V to (V 0.3V) Current Storage Temperature Range ................ 65C to 150C + Lead Temperature (Soldering, 10 sec).................. 300C IN , IN , HYST ................................................. 20mA REF ................................................................... 20mA OUT .................................................................. 50mA PACKAGE/ORDER INFORMATION TOP VIEW TOP VIEW TOP VIEW OUT A OUT B OUT A 1 8 OUT B 1 8 OUT A 1 8 OUT B + + + V 2 7 V V 2 7 V V 2 7 V + + + + IN A 3 IN B IN A 3 6 REF IN A 3 6 REF 6 + IN B 4 HYST IN A 4 5 IN B 5 IN B 4 5 HYST S8 PACKAGE S8 PACKAGE S8 PACKAGE 8-LEAD PLASTIC SO 8-LEAD PLASTIC SO 8-LEAD PLASTIC SO T = 150C, = 125C/ W T = 150C, = 125C/ W T = 150C, = 125C/ W JMAX JA JMAX JA JMAX JA S8 PART ORDER PART S8 PART ORDER PART S8 PART ORDER PART MARKING NUMBER NUMBER MARKING NUMBER MARKING 1843 LTC1841CS8 1841 LTC1842CS8 1842 LTC1843CS8 1843I LTC1841IS8 1841I LTC1842IS8 1842I LTC1843IS8 Consult factory for Military grade parts. + ELECTRICAL CHARACTERISTICS V = 5V, V = 0V, T = 25C unless otherwise noted. A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Power Supply + V Supply Voltage Range LTC1841 l 2.0 11 V LTC1842/LTC1843 l 2.5 11 V I Supply Current HYST = REF (Note 2) l 3.5 5.7 A CC Comparator V Comparator Input Offset Voltage (Note 3) l 3 10 mV OS + + I Input Leakage Current (IN , IN)IN = IN = 2.5V (LTC1841), l 0.01 1.0 nA IN + IN = IN = V (LTC1842/LTC1843) REF + V Comparator Input Voltage Range l V V 1.3V V IN + PSRR Power Supply Rejection Ratio V = 2V to 11V (LTC1841), 0.1 1 mV/V + V = 2.5V to 11V (LTC1842/LTC1843) + CMRR Common Mode Rejection Ratio V = V to (V 1.3V) LTC1841 l 0.1 1 mV/V CM V Hysteresis Input Voltage Range LTC1842/LTC1843 l V 50mV V V HYST REF REF 2 U W U W U WW