Features and Benefits
- Measures Accumulated Battery Charge and Discharge
- 3.6V to 60V Operating Range for Multiple Cells
- 14-Bit ADC Measures Voltage, Current and Temperature
- 1% Voltage, Current and Charge Accuracy
- ±50mV Sense Voltage Range
- High Side Sense
- I2C Interface/SMBus Interface
- General Purpose Measurements for Any Battery Chemistry and Capacity
- Configurable Alert Output/Charge Complete Input
- Quiescent Current Less Than 150μA
- Small 8-Lead 3mm × 3mm DFN Package
The LTC2944 measures battery charge state, battery voltage, battery current and its own temperature in portable product applications. The wide input voltage range allows use with multicell batteries up to 60V. A precision coulomb counter integrates current through a sense resistor between the battery’s positive terminal and the load or charger. Voltage, current and temperature are measured with an internal 14-bit No Latency ΔΣ™ ADC. The measurements are stored in internal registers accessible via the on-board I2C/SMBus Interface.
The LTC2944 features programmable high and low thresholds for all four measured quantities. If a programmed 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 LTC2944 requires only a single low value sense resistor to set the measured current range.
- Electric and Hybrid Electric Vehicles
- Power Tools
- Electric Bicycles, Motorcycles, Scooters
- High Power Portable Equipment
- Photo Voltaics
- Backup Battery Systems
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Demonstration circuit 1812A-B features the LTC2944. Demonstration circuit 1812A-C features the LTC2943-1. The LTC2943/LTC2943-1 has an operating range of 3.6V to 20V, while the LTC2944 has an operating range of 3.6V to 60V, making all three devices perfectly suited for multicel battery applications. A precision analog coulomb counter integrates current measured through a sense resistor between the battery’s positive terminal and the load or charger. The LTC2943/LTC2943-1 measures voltage, current and temperature with an internal 14-bit No Latency ∆∑™ ADC. The LTC2944 measures voltage, current and temperature with an internal 16-bit No Latency ∆∑ADC. The measurements are stored in internal registers accessible via the onboard SMBus/I2C interface.
Documentation & Resources
R567 Reliability Data3/23/2018122K
DC1812A - Demo Manual12/8/2015500K
60V Battery Gas Gauge7/13/2017605K
Power and Thermal Monitoring1/9/20171M
Tools & Simulations
Linduino is Analog Devices’ Arduino compatible system for developing and distributing firmware libraries and example code for our integrated circuits. Each Linduino-supported product includes an example main program, defined in the LTSketchbook/Part Number folder and driver code, defined in the LTSketchbook/libraries folder.
Linduino code repository on GitHub and instructions on how to use the code.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
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Buy Now Pricing
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.