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Single-cell Impedance Track gas gauge

Posted: 17 Nov 2008     Print Version  Bookmark and Share

Keywords:bq27350  Impedance Track  Li-polymer batteries 

Texas Instruments bq27350 is an advanced, feature-rich battery gas gauge IC, designed for accurate reporting of available charge of Li-ion or Li-polymer batteries in single-cell applications. The bq27350 incorporates the patented Impedance Track technology, whose unique algorithm allows for real-time tracking of battery capacity change, battery impedance, voltage, current, temperature, and other critical information of the battery pack. Unlike the current integration- or voltage correlation-based gas gauge algorithms, the Impedance Track algorithm takes full advantage of battery response to electronic and thermal stimuli and therefore maintains the best capacity estimate accuracy over the lifetime of the battery. The bq27350 automatically accounts for charge and discharge rate, self-discharge, and cell ageing, resulting in excellent gas-gauging accuracy even when the battery ages. The IC also provides a variety of battery performance parameters to a system host over a standard serial communication bus.

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