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LTC1998 - 2.5µA, 1% Accurate SOT-23 Comparator and Voltage Reference for Battery Monitoring

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.

Features 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 > or = 1.5V Low Profile (1mm) ThinSOT™ Package Typical Application

Applications Lithium-Ion Battery-Powered Equipment PDAs Cell Phones Handheld Instruments Battery Packs Pagers Palm Top Comp Packaging