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LTC1843 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1843 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LTC1841/LTC1842/LTC1843 Ultralow Power Dual Comparators with Reference LTC1843 Supply Current vs Supply Voltage SUPPLY VOLTAGE (V) 0 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 5.7 µA 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 0.01 µF 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. The LTC1841/LTC1842/LTC1843 are available in SO-8 packages. FEATURES DESCRIPTION s Ultralow Quiescent Current: 3.5 µA Typ s Open-Drain Outputs Typically Sink Greater Than 20mA s Wide Supply Range: (LTC1841) Single: 2V to 11V Dual: ±1V to ±5.5V s Input Voltage Range Includes the Negative Supply s Reference Output Drives 0.01 µF Capacitor s Adjustable Hysteresis s 12 µs Propagation Delay with 10mV Overdrive s No Current Spike When Switching R4 20k RC 20k CC 0.0 µF R7 500k OUTPUT 5V 600mA LBO R5 1.1M R3 1M R2 100k R1 1.5M C1 100 µF 1-CELL Li-Ion BATTERY R6 25k 7 8 67 D1 L1 10 µH 4 8 3 1 2 1 6 C1, C2: SANYO OS-CON D1: MOTOROLA MBRS130LT3 L1: COILTRONICS CTX10-3 25 1841/43 TA01 3 4 + C2 100 µF Si9924DY + – + VCC OUT B LTC1843 OUT A REF V – HYST IN A+ IN B – VIN SW LT1302-5 SHDN PGND IT SENSE VC GND TYPICAL APPLICATION Single Li-Ion Cell to 5V Supply , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATIONS s Battery-Powered System Monitoring s Threshold Detectors s Window Comparators s Oscillator Circuits |
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