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LTC2941 - Battery Gas Gauge with I2C Interface

The LTC2941 measures battery charge state in battery-supplied handheld PC and portable product applications. Its operating range is perfectly suited for single-cell Li-Ion batteries. A precision coulomb counter integrates current through a sense resistor between the battery’s positive terminal and the load or charger. The measured charge is stored in internal registers. An SMBus/I2C interface accesses and configures the device.

The LTC2941 features programmable high and low thresholds for accumulated charge. If a threshold is exceeded, the device communicates an alert using either the SMBus alert protocol or by setting a flag in the internal status register.

The LTC2941 requires only a single low value external sense resistor to set the current range.

Features Indicates Accumulated Battery Charge and Discharge High Accuracy Analog Integration High Side Sense 1% Charge Accuracy ±50mV Sense Voltage Range SMBus/I2C Interface Configurable Alert Output/Charge Complete Input 2.7V to 5.5V Operating Range Quiescent Current Less Than 100μA Small 6-Pin 2mm × 3mm DFN Package Typical Application

Applications Low Power Handheld Products Cellular Phones MP3 Player Cameras GPS Packaging

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