Features

• 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

Typical Application

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 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 onboard 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.