LTC1998| Datasheet

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FEATURES
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LTC1998 2.5uA, 1% Accurate SOT-23 Comparator and Voltage Reference for Battery Monitoring DESCRIPTION
The LTC 1998 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.

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

APPLICATIONS
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Lithium-Ion Battery-Powered Equipment PDAs Cell Phones Handheld Instruments Battery Packs Pagers Palm Top Computers POS Terminals

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.

BLOCK DIAGRAM
Threshold Voltage Error vs Temperature
BATT VLOGIC 1.1R VHYST.A VTH.A 1.2V % ERROR THRESHOLD ADJUST 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1
1998 BD

VTH.A SET BY 1% EXTERNAL R, THRESHOLD = 3V

R

BATTLO

VTH.A = 1V THRESHOLD = 3V VTH.A SHORTED TO GROUND, THRESHOLD = 2.5V

0 45 25

35 15 55 5 TEMPERATURE ( C)

75

95

1998 TA02

1998fa

1

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LTC1998 DATASHEET