LTC2944CDD#PBF

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1. Description

The LTC®2944 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 counterintegratescurrentthrough a senseresistorbetween 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 onboard I2C/SMBus Interface. TheLTC2944featuresprogrammablehighandlowthresholds 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

2. Features

    1. Measures Accumulated Battery Charge and Discharge

    2. 3.6V to 60V Operating Range for Multiple Cells

    3. 14-Bit ADC Measures Voltage, Current and Temperature

    4. 1% Voltage, Current and Charge Accuracy

    5. ±50mV Sense Voltage Range

    6. High Side Sense

    7. I2C Interface/SMBus Interface

    8. General Purpose Measurements for Any Battery Chemistry and Capacity

    9. Configurable Alert Output/Charge Complete Input

  10. Quiescent Current Less Than 150µA

  11. Small 8-Lead 3mm × 3mm DFN Package

3. Applications

    1. Electric and Hybrid Electric Vehicles

    2. Power Tools

    3. Electric Bicycles, Motorcycles, Scooters

    4. High Power Portable Equipment

    5. Photo Voltaics

    6. Backup Battery Systems

4. Pin Configuration

5. Package overview