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Features
- Ultralow Quiescent Current: 2.1µA Typ
- Reference Output Drives 0.01µF Capacitor
- Adjustable Hysteresis
- Wide Supply Range:
- Single: 2V to 11V
- Dual: ±1V to ±5.5V
- Input Voltage Range Includes the Negative Supply
- TTL/CMOS Compatible Outputs
- 12µs Propagation Delay with 10mV Overdrive
- No Crowbar Current
- 40mA Continuous Source Current
- Pin Compatible Upgrades for MAX921/931
- 3mm × 3mm × 0.75mm DFN Package
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The LTC1440 is an ultralow power comparator with a built-in voltage reference. The comparator features less than 4.0µA supply current over temperature. The internal reference is 1.182V with ±1% accuracy. The LTC1440 has programmable hysteresis and TTL/CMOS outputs that sink and source current. The reference output can drive a bypass capacitor of up to 0.01µF without oscillation.
The comparators operate from a single 2V to 11V supply or a dual ±1V to ±5.5V supply. Comparator hysteresis is easily programmed by using two resistors and the HYST pin. Each comparator’s input operates from the negative supply to within 1.3V of the positive supply. The comparator output stage can continuously source up to 40mA. By eliminating the cross-conducting current that normally happens when the comparator changes logic states, the power supply glitches are eliminated.
The LTC1440 is available in a 3mm × 3mm × 0.75mm DFN package, as well as 8-pin PDIP and SO-8.
Applications
- Battery-Powered System Monitoring
- Threshold Detectors
- Window Comparators
- Oscillator Circuits
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LTC1440
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Application Note 2
Design Note 6
DN142 - Ultralow Quiescent Current DC/DC Converters for Light Load Applications
Design Note 142: Ultralow Quiescent Current DC/DC Converters for Light Load Applications
Design Note 123: Ultralow Power Comparators Include Reference
Design Note 163: 1µA Op Amp Permits Precision Portable Circuitry
Design Note 137: New Comparators Feature Micropower Operation Under All Conditions
Design Note 161: The Smart Rock
Technical Articles 4
Unique Analog Multiplier Continuously Monitors Instantaneous Power and Simplifies Design of Power Control Loops
Wide Input Range, High Efficiency Step-Down Switching Regulators
Comparator Circuit Provides Automatic Shutdown of the LT1795 High Speed ADSL Power Amplifier
Micropower, Precision Current Sense Amplifier Operates from 2.5V to 60V
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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
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Jun 5, 2024
- 24_0004
Epoxy Change from Henkel 8290 to 8290A for MSOP (3)
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Feb 3, 2020
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Migrating Bottom Trace Code Marking to Top Side Laser Marking for PDIP Package
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Oct 11, 2022
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Epoxy Change from Henkel 8290 to 8290A for PDIP Package
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Aug 6, 2022
- 22_0172
Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG]
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PRODUCTION
Oct 12, 2022
- 22_0255
Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)
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LTC1440CS8#TRPBF
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Jun 16, 2021
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Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM
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Epoxy Change from Henkel 8290 to 8290A for MSOP (3)
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Feb 3, 2020
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Migrating Bottom Trace Code Marking to Top Side Laser Marking for PDIP Package
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Oct 11, 2022
- 22_0241
Epoxy Change from Henkel 8290 to 8290A for PDIP Package
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Aug 6, 2022
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Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG]
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LTC1440IN8#PBF
PRODUCTION
Oct 12, 2022
- 22_0255
Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)
LTC1440CS8#PBF
PRODUCTION
LTC1440CS8#TRPBF
PRODUCTION
LTC1440IS8#PBF
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LTC1440IS8#TRPBF
PRODUCTION
Jun 16, 2021
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Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM
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PRODUCTION
LTC1440CS8#TRPBF
PRODUCTION
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Software & Part Ecosystem
Tools & Simulations 1
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
Lt Spice
