LTC2944IDD#PBF

LTC2944 is a battery gas gauge with temperature, voltage and current measurement. It measures battery charge state, battery voltage, battery current and its own temperature in portable product applications. 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. It 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. It is used in application such as electric and hybrid electric vehicles, power tools, electric bicycles, motorcycles, scooters, high power portable equipment, photo voltaics, backup battery systems etc.

• Measures accumulated battery charge and discharge
• Supply voltage range is 3.6V to 60V
• 1% voltage, current and charge accuracy
• Sense voltage differential input range is ±50mV max at (VSENSE+ -VSENSE- TA = 25°C)
• High side sense, general purpose measurements for any battery chemistry and capacity
• Configurable alert output/charge complete input
• Quiescent current is 150µA max at (battery gas gauge on, ADC sleep, TA = 25°C)
• Undervoltage lockout threshold is 3.5V typical at (VSENSE+ falling, TA = 25°C)
• Operating ambient temperature is -40°C to 85°C
• Package style is 8-lead plastic DFN

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party