LTC2941-1 - 1A I2C 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.

Features

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

Typical Application

Applications

Low Power Handheld Products
Cellular Phones
MP3 Player
Cameras
GPS

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC2941CDCB-1#PBF	2x3 DFN-6	C	$2.40
LTC2941CDCB-1#TRMPBF	2x3 DFN-6	C	$2.41	$1.70
LTC2941CDCB-1#TRPBF	2x3 DFN-6	C		$1.65
LTC2941IDCB-1#PBF	2x3 DFN-6	I	$2.87
LTC2941IDCB-1#TRMPBF	2x3 DFN-6	I	$2.88	$2.03
LTC2941IDCB-1#TRPBF	2x3 DFN-6	I		$1.98