LTC1998 Datasheet | Linear Technology

LTC1998 2.5µA, 1% Accurate SOT-23 parator and Voltage Reference for Battery Monitoring Features s s s s s s s DESCRIPTIO 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) Thin SOTTM Package The LTC®1998 is a micropower parator 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 10m V to 750m V 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 batterylow logic output to operate below the battery voltage, allowing patibility 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. U APPLICATIO S s Lithium-Ion Battery-Powered Equipment PDAs Cell Phones Handheld Instruments Battery Packs Pagers Palm Top puters POS Terminals , LTC and LT are registered trademarks of Linear Technology Corporation. Thin SOT is a trademark of Linear Technology Corporation. BLOCK DIAGRA Threshold Voltage Error vs Temperature 1.0 BATT VLOGIC 1.1R VHYST.A VTH.A 1.2V % ERROR THRESHOLD ADJUST 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 1998 BD BATTLO - 45 - 25 VTH.A SET BY 1% EXTERNAL R, THRESHOLD = 3V VTH.A = 1V THRESHOLD = 3V VTH.A SHORTED TO GROUND,...