LTC1998 2.5A, 1% Accurate SOT-23 Comparator and Voltage Reference for Battery Monitoring FEATURES DESCRIPTION n High Accuracy Trip Voltage: 1% Max Error Using The LTC 1998 is a micropower comparator and a precision External 1% Resistors adjustable reference in a 6-pin SOT-23 package that is n Adjustable Threshold Voltage and Hysteresis optimized for lithium-ion low battery detection circuits. n Quiescent Current: 2.5A Typ The LTC1998 features a voltage detection circuit with an n Output Swings Rail-to-Rail adjustable threshold voltage and hysteresis. The threshold n Thresholds Programmable from 2.5V to 3.25V voltage can be programmed from 2.5V to 3.25V with two n Output State Guaranteed for V 1.5V BATT external resistors. A 10mV to 750mV hysteresis can be n Low Pro le (1mm) ThinSOT Package added with a third external resistor. A proprietary internal architecture maintains 1% thresh- APPLICATIONS old voltage accuracy over temperature with low cost 1% n Lithium-Ion Battery-Powered Equipment external resistors. PDAs A separate power supply pin, V allows the battery-low LOGIC, Cell Phones logic output to operate below the battery voltage, allowing Handheld Instruments compatibility with low voltage microprocessors without a Battery Packs pull-up resistor. Power supply glitches are eliminated by Pagers preventing the cross-conducting current which occurs Palm Top Computers when the output changes state. POS Terminals The LTC1998 operates with battery or supply voltages L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other up to 5.5V and its battery-low output is valid for battery trademarks are the property of their respective owners. voltages above 1.5V. BLOCK DIAGRAM Threshold Voltage Error vs Temperature 1.0 BATT 0.9 V SET BY 1% V TH.A LOGIC 0.8 EXTERNAL R, 0.7 THRESHOLD = 3V 1.1R 0.6 V HYST.A V =1V 0.5 THRESHOLD TH.A BATTLO THRESHOLD = 3V R ADJUST 0.4 V TH.A V SHORTED TH.A 0.3 TO GROUND, 1.2V THRESHOLD = 2.5V 0.2 0.1 0 1998 BD 45 25 5 15 35 55 75 95 TEMPERATURE (C) 1998 TA02 1998fb 1 % ERRORLTC1998 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW Total Supply Voltage (BATT or V to GND) ............6V LOGIC BATT 1 6BATTLO Voltage GND 2 5 V LOGIC V , V ....................... BATT + 0.3V to GND 0.3V TH.A H.A V 3 4 V TH.A H.A BATTLO ..........................V + 0.3V to GND 0.3V LOGIC S6 PACKAGE Operating Temperature Range (Note 3).... 40C to 85C 6-LEAD PLASTIC TSOT-23 T = 150C, = 250C/W Speci ed Temperature Range (Note 4) JMAX JA LTC1998C ............................................ 40C to 85C LTC1998I.............................................. 40C to 85C Storage Temperature Range ................... 65C to 150C Lead Temperature (Soldering, 10 sec) .................. 300C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LTC1998CS6 PBF LTC1998CS6 TRPBF LTTY 6-Lead Plastic TSOT-23 40C to 85C LTC1998IS6 PBF LTC1998IS6 TRPBF LTTY 6-Lead Plastic TSOT-23 40C to 85C LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LTC1998CS6 LTC1998CS6 TR LTTY 6-Lead Plastic TSOT-23 40C to 85C LTC1998IS6 LTC1998IS6 TR LTTY 6-Lead Plastic TSOT-23 40C to 85C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container. For more information on lead free part marking, go to: