Datasheet LTC1841, LTC1842, LTC1843 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | Ultralow Power Dual Comparators with Reference |
| Páginas / Página | 12 / 1 — FEATURES. DESCRIPTION. Ultralow Quiescent Current: 3.5. A Typ. Open-Drain … |
| Formato / tamaño de archivo | PDF / 232 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. Ultralow Quiescent Current: 3.5. A Typ. Open-Drain Outputs Typically Sink. Greater Than 20mA
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LTC1841/LTC1842/LTC1843 Ultralow Power Dual Comparators with Reference
U FEATURES DESCRIPTION
■
Ultralow Quiescent Current: 3.5
µ
A Typ
The LTC®1841/LTC1842/LTC1843 are ultralow power dual ■
Open-Drain Outputs Typically Sink
comparators with built-in reference (LTC1842/LTC1843).
Greater Than 20mA
The comparators feature less than 5.7µA supply current ■ 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 ■ Input Voltage Range Includes the Negative Supply up to 0.01µF without oscillation. ■
Reference Output Drives 0.01
µ
F Capacitor
The LTC1841 operates from a single 2V to 11V supply or ■
Adjustable Hysteresis
a dual ±1V to ±5.5V supply. The LTC1842/LTC1843 ■ 12µs Propagation Delay with 10mV Overdrive operate from a single 2.5V to 11V supply or a dual ±1.25V ■ No Current Spike When Switching to ±5.5V supply. The LTC1842/LTC1843 hysteresis is
U
easily programmed by using two resistors and the HYST
APPLICATIONS
pin. The comparators’ input operates from the negative supply to within 1.3V of the positive supply. The compara- ■ Battery-Powered System Monitoring tors’ output stage can typically sink greater than 20mA. By ■ Threshold Detectors eliminating the cross-conduction current that normally ■ Window Comparators happens when the comparators change logic states, power ■ 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.
U TYPICAL APPLICATION Single Li-Ion Cell to 5V Supply LTC1843 Supply Current
1-CELL
vs Supply Voltage
+ L1 C1 R6 Li-Ion 10 D1 µH 100µF 25k BATTERY 5 7 TA = 25°C R1 6 7 V 1.5M CC LTC1843 OUTPUT 4 IN B – – VIN SW 5V 4 LT1302-5 Si9924DY 600mA OUT B 8 3 µA) SHDN I 8 T 4 + R2 PGND SENSE 3 + 100k V C2 C GND 100µF 2 1 2 3 IN A+ RC + 20k R7 OUT A 1 500k SUPPLY CURRENT ( R3 CC 1M 1 0.0 6 REF µF – LBO 1841/43 TA01 0 R4 C1, C2: SANYO OS-CON 0 2 4 6 8 10 12 20k V – HYST D1: MOTOROLA MBRS130LT3 SUPPLY VOLTAGE (V) R5 L1: COILTRONICS CTX10-3 2 5 1841/43 TA02 1.1M 1
U FEATURES DESCRIPTION
■
Ultralow Quiescent Current: 3.5
µ
A Typ
The LTC®1841/LTC1842/LTC1843 are ultralow power dual ■
Open-Drain Outputs Typically Sink
comparators with built-in reference (LTC1842/LTC1843).
Greater Than 20mA
The comparators feature less than 5.7µA supply current ■ 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 ■ Input Voltage Range Includes the Negative Supply up to 0.01µF without oscillation. ■
Reference Output Drives 0.01
µ
F Capacitor
The LTC1841 operates from a single 2V to 11V supply or ■
Adjustable Hysteresis
a dual ±1V to ±5.5V supply. The LTC1842/LTC1843 ■ 12µs Propagation Delay with 10mV Overdrive operate from a single 2.5V to 11V supply or a dual ±1.25V ■ No Current Spike When Switching to ±5.5V supply. The LTC1842/LTC1843 hysteresis is
U
easily programmed by using two resistors and the HYST
APPLICATIONS
pin. The comparators’ input operates from the negative supply to within 1.3V of the positive supply. The compara- ■ Battery-Powered System Monitoring tors’ output stage can typically sink greater than 20mA. By ■ Threshold Detectors eliminating the cross-conduction current that normally ■ Window Comparators happens when the comparators change logic states, power ■ 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.
U TYPICAL APPLICATION Single Li-Ion Cell to 5V Supply LTC1843 Supply Current
1-CELL
vs Supply Voltage
+ L1 C1 R6 Li-Ion 10 D1 µH 100µF 25k BATTERY 5 7 TA = 25°C R1 6 7 V 1.5M CC LTC1843 OUTPUT 4 IN B – – VIN SW 5V 4 LT1302-5 Si9924DY 600mA OUT B 8 3 µA) SHDN I 8 T 4 + R2 PGND SENSE 3 + 100k V C2 C GND 100µF 2 1 2 3 IN A+ RC + 20k R7 OUT A 1 500k SUPPLY CURRENT ( R3 CC 1M 1 0.0 6 REF µF – LBO 1841/43 TA01 0 R4 C1, C2: SANYO OS-CON 0 2 4 6 8 10 12 20k V – HYST D1: MOTOROLA MBRS130LT3 SUPPLY VOLTAGE (V) R5 L1: COILTRONICS CTX10-3 2 5 1841/43 TA02 1.1M 1