LTC1998

PRODUCTION

2.5µA, 1% Accurate SOT-23 Comparator and Voltage Reference for Battery Monitoring

Data Sheet Product Selection Table
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Overview

  • High Accuracy Trip Voltage: 1% Max Error using External 1% Resistors
  • Adjustable Threshold Voltage and Hysteresis
  • Quiescent Current: 2.5µA Typ
  • Output Swings Rail-to-Rail
  • Thresholds Programmable from 2.5V to 3.25V
  • Output State Guaranteed for VBATT ≥ 1.5V
  • Low Profile (1mm) ThinSOT™ Package

The LTC1998 is a micropower comparator and a precision adjustable reference in a 6-pin SOT-23 package that is optimized for lithium-ion low battery detection circuits.

The LTC1998 features a voltage detection circuit with an adjustable threshold voltage and hysteresis. The threshold voltage can be programmed from 2.5V to 3.25V with two external resistors. A 10mV to 750mV hysteresis can be added with a third external resistor.

A proprietary internal architecture maintains 1% threshold voltage accuracy over temperature with low cost 1% external resistors.

A separate power supply pin, VLOGIC, allows the battery-low logic output to operate below the battery voltage, allowing compatibility with low voltage microprocessors without a pull-up resistor. Power supply glitches are eliminated by preventing the cross-conducting current which occurs when the output changes state.

The LTC1998 operates with battery or supply voltages up to 5.5V and its battery-low output is valid for battery voltages above 1.5V.

Applications

  • Lithium-Ion Battery-Powered Equipment
    • PDAs
    • Cell Phones
    • Handheld Instruments
    • Battery Packs
    • Pagers
    • Palm Top Computers
    • POS Terminals
LTC1998
2.5µA, 1% Accurate SOT-23 Comparator and Voltage Reference for Battery Monitoring
Threshold Voltage Error vs Temperature Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 1

Data Sheet

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC1998
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