1A IC Battery Gas Gauge with Internal Sense Resistor

The LTC2941-1 measures battery charge state in battery-powered 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 an internal 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 LTC2941-1 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.

Integrated Sense Resistor

LTC2941

No

LTC2941-1

Yes

Applications

* Low Power Handheld Products

* Cellular Phones

* MP3 Player

* Cameras

* GPS

* Indicates Accumulated Battery Charge and Discharge

* SMBus/I2C Interface

* Integrated 50mΩ High Side Sense Resistor

* ±1A Sense Current Range

* High Accuracy Analog Integration

* 1% Charge Accuracy

* 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