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1LTC1841 LTC1842 LTC1843 Ultralow Power Dual

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Description

1LTC1841/LTC1842/LTC1843 Ultralow Power Dual Comparators with Reference LTC1843 Supply Current vs Supply Voltage SUPPLY VOLTAGE (V) 0 SU PP LY C UR RE NT (µ A) 3 4 5 8 1841/43 TA02 2 1 0 2 4 6 10 12 TA = 25°C The LTC®1841/LTC1842/LTC1843 are ultralow power dual comparators with built-in reference (LTC1842/LTC1843). The comparators feature less than 5.7µA supply current over temperature, a 1.182V ±1% reference, program- mable hysteresis and open-drain outputs that sink cur- rent. The reference output can drive a bypass capacitor of up to 0.01µF without oscillation. The LTC1841 operates from a single 2V to 11V supply or a dual ±1V to ±5.5V supply. The LTC1842/LTC1843 operate from a single 2.5V to 11V supply or a dual ±1.25V to ±5.5V supply. The LTC1842/LTC1843 hysteresis is easily programmed by using two resistors and the HYST pin. The comparators' input operates from the negative supply to within 1.3V of the positive supply. The compara- tors' output stage can typically sink greater than 20mA. By eliminating the cross-conduction current that normally happens when the comparators change logic states, power supply glitches are eliminated.

  • output load

  • power dual

  • ±10 mv

  • psrr power

  • supply voltage

  • mv

  • µa comparator

  • comparator response

  • current


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FEATURESnUltralow Quiescent Current: 3.5mA TypnOpen-Drain Outputs Typically SinkGreater Than 20mAnWide Supply Range: (LTC1841)Single: 2V to 11VDual: ±1V to ±5.5VnInput Voltage Range Includes the Negative SupplynReference Output Drives 0.01mF CapacitornAdjustable Hysteresisn12ms Propagation Delay with 10mV OverdrivenNo Current Spike When SwitchingAPPLICATIONSnBattery-Powered System MonitoringnThreshold DetectorsnWindow ComparatorsnOscillator Circuits, LTC and LT are registered trademarks of Linear Technology Corporation.LTC1841/LTC1842/LTC1843ComparaUtlotrrsa lwoiwth  PRoewfeerr eDnucaelDESCRIPTIONThe LTC®1841/LTC1842/LTC1843 are ultralow power dualcomparators with built-in reference (LTC1842/LTC1843).The comparators feature less than 5.7mA supply currentover temperature, a 1.182V ±1% reference, program-mable hysteresis and open-drain outputs that sink cur-rent. The reference output can drive a bypass capacitor ofup to 0.01mF without oscillation.The LTC1841 operates from a single 2V to 11V supply ora dual ±1V to ±5.5V supply. The LTC1842/LTC1843operate from a single 2.5V to 11V supply or a dual ±1.25Vto ±5.5V supply. The LTC1842/LTC1843 hysteresis iseasily programmed by using two resistors and the HYSTpin. The comparators’ input operates from the negativesupply to within 1.3V of the positive supply. The compara-tors’ output stage can typically sink greater than 20mA. Byeliminating the cross-conduction current that normallyhappens when the comparators change logic states, powersupply glitches are eliminated.The LTC1841/LTC1842/LTC1843 are available in SO-8packages.TYPICAL APPLICATIONSingle Li-Ion Cell to 5V Supply1-CELL +R6 L1 BATLTi-EIRoYn 1C010 mF25k10mHD171.5RM1 VCCLTC184367OUTPUT 4IN BVINSW5V OUT B83LT1302-5Si9924DY600mASHDNITR2 8PGNDSENSE4+100kVCGNDC2 21100mF3IN A++RC R7 R3 OUT A120CkC 500k1M6REF0.0mF1841/43 TA01LBOR4 C1, C2: SANYO OS-CON 20kVHYSTD1: MOTOROLA MBRS130LT3 R5 25L1: COILTRONICS CTX10-3M1.1LTC1843 Supply Currentvs Supply Voltage5TA = 25¡C43210024681012SUPPLY VOLTAGE (V)1841/43 TA021