LTC1443

PRODUCTION

Ultralow Power Quad Comparators with Reference

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Overview

  • Ultralow Quiescent Current: 8.5μA Max
  • Reference Output Drives 0.01μF Capacitor
  • Adjustable Hysteresis (LTC1444/LTC1445)
  • Wide Supply Range
    Single: 2V to 11V
    Dual: ±1V to ±5.5V
  • Input Voltage Range Includes the Negative Supply
  • TTL/CMOS Compatible Outputs
  • Propagation Delay: 12μs (Typ) (10mV Overdrive)
  • No Crowbar Current
  • 40mA Continuous Source Current
  • Pin Compatible Upgrades for MAX924 (LTC1443)
  • Low Profile (5mm × 4mm × 0.8mm) DFN Package

The LTC1443/LTC1444/LTC1445 are ultralow power quad comparators with a built-in reference. The comparators feature less than 8.5μA supply current over temperature, an internal reference (1.182V ±1% for LTC1443 or 1.221V ±1% for LTC1444/LTC1445), programmable hysteresis LTC1444/LTC1445) and TTL/CMOS output (LTC1443/ LTC1445) that sinks and sources current (open-drain output for LTC1444). 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 (LTC1443). Comparator hysteresis is easily programmable using two resistors and the HYST pin (LTC1444/LTC1445). Each comparator’s input operates from the negative supply to within 1.3V of the positive supply. The LTC1443/LTC1445 comparator output stage can continuously source up to 40mA. By eliminating the cross-conducting current that normally happens when the comparator changes logic states, power supply glitches are eliminated.

The LTC1443/LTC1444/LTC1445 are available in the 16-pin SO, PDIP and DFN packages.

Applications

  • Battery-Powered System Monitoring
  • Threshold Detectors
  • Window Comparators
  • Oscillator Circuits
LTC1443
Ultralow Power Quad Comparators with Reference
Reference Settling Test Circuit Reference Settling Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 2

Data Sheet

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC1443
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