Overview

Features and Benefits

  • 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

Product Details

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

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Design Resources

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.

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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