Coulomb Counter (Battery Fuel Gauge)

Analog Devices’ battery management gas gauges and coulomb counters accurately measure and report battery capacity in single cell or multicell handheld applications. Charge accuracy is uncompromised thanks to a variety of unique sensing techniques that appear seamless to the user. High-side current sensing allows downstream failure detection and avoids ground disturbance. Analog integrators digitize charge directly, resulting in cancelled amplifier offsets, minimal gain error, and better overall charge accuracy. Some models also provide battery voltage and temperature, while others integrate a sense resistor to minimize component count and increase accuracy even further. All devices have small footprints and provide simple digital interfacing with a host processor.
Product Selection Table

Coulomb Counter (Battery Fuel Gauge)

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(min)
(V)
Vin
(max)
(V)
Sense ResistorADCCommentsPrice (1000+)
($ US)
1LTC2944 3.6 60 External 14-Bit 60V Battery Gas Gauge with Temperature, Voltage and Current Measurement $2.85 (LTC2944CDD#PBF)
2LTC2943-1 3.6 20 Integrated 1A Rsense 14-Bit 1A Multicell Battery Gas Gauge with Temperature, Voltage and Current Measurement $2.70 (LTC2943CDD-1#PBF)
3LTC3335 1.8 5.5 Integrated 250mA Rsense- Nanopower Buck-Boost DC/DC with Integrated Coulomb Counter $3.35 (LTC3335EUDC#PBF)
4LTC4015 4.5 35 External 14-Bit Multichemistry Buck Battery Charger Controller with Digital Telemetry System $5.95 (LTC4015EUHF#PBF)
5LTC2943 3.6 20 External 14-Bit Multicell Battery Gas Gauge with Temperature, Voltage and Current Measurement $2.35 (LTC2943CDD#PBF)
6LTC2942-1 2.7 5.5 Integrated 1A Rsense 14-Bit 1A Battery Gas Gauge with Internal Rsense and Temp/Voltage Measurement $1.85 (LTC2942CDCB-1#TRPBF)
7LTC2941-1 2.7 5.5 Integrated 1A Rsense- 1A I2C Battery Gas Gauge with Internal Sense Resistor $1.65 (LTC2941CDCB-1#TRPBF)
8LTC2942 2.7 5.5 External 14-Bit Battery Gas Gauge with Temperature, Voltage Measurement $1.50 (LTC2942CDCB#TRPBF)
9LTC2941 2.7 5.5 External- Battery Gas Gauge with I2C Interface $1.30 (LTC2941CDCB#TRPBF)
10LTC4150 2.7 8.5 External- Coulomb Counter/Battery Gas Gauge $1.50 (LTC4150CMS#PBF)