LTC4150 Coulomb Counter/ Battery Gas Gauge FEATURESDESCRIPTION n Indicates Charge Quantity and Polarity The LTC®4150 measures battery depletion and charging n ±50mV Sense Voltage Range in handheld PC and portable product applications. The n Precision Timer Capacitor or Crystal Not Required device monitors current through an external sense resistor n 2.7V to 8.5V Operation between the battery’s positive terminal and the battery’s n High Side Sense load or charger. A voltage-to-frequency converter trans- n 32.55Hz/V Charge Count Frequency forms the current sense voltage into a series of output n 1.5μA Shutdown Current pulses at the interrupt pin. These pulses correspond to a n 10-Pin MSOP Package fi xed quantity of charge fl owing into or out of the battery. The part also indicates charge polarity as the battery is APPLICATIONS depleted or charged. The LTC4150 is intended for 1-cell or 2-cell Li-Ion and n Battery Chargers 3-cell to 6-cell NiCd or NiMH applications. n Palmtop Computers and PDAs n Cellular Telephones and Wireless Modems L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode are registered trademarks and ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATIONIntegral Nonlinearity, % of Full Scale 0.5 0.4 R CHARGER SENSE LOAD + 0.3 0.2 4.7μF 0.1 RL RL 0 SENSE– SENSE+ VDD C + –0.1 F INT 4.7μF LTC4150 CLR CHG μP –0.2 C – F DISCHG ERROR (% FULL SCALE) POL –0.3 SHDN GND –0.4 –0.5 4150 TA01a –50 –25 0 25 50 CURRENT SENSE VOLTAGE (mV) 4150 TA01b 4150fc 1 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM TIMING DIAGRAMS OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS
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