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Fast-charge tech squeezes more juice out of Li-ion cell

Posted: 11 Jun 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Li-ion? fast-charge technology? battery?

Texas Instruments Inc. (TI) has unveiled a pair of power management chipsets featuring the company's patented MaxLife fast-charge technology that lets consumers charge single-cell Li-ion batteries faster and experience longer battery life. The bq27530 and bq27531 fuel gauge circuits, coupled with TI's bq2416x and bq2419x chargers, optimise battery performance using the highest possible charge rates with minimal battery degradation stated TI.

The MaxLife technology leverages an innovative degradation modelling system to minimise charge time while extending battery service life, as much as 30 per cent according to lab tests, the firm indicated. Based on TI's Impedance Track battery capacity measurement technology, the MaxLife algorithm accurately predicts and avoids charge conditions that could degrade the battery.

Traditional software-controlled battery management systems, whether implemented with an MCU, PMIC or digital signal processor, are limited in their ability to predict accurate battery capacity and translate that information into run time. The bq27530 and bq24160 chipset for 2.5A charge rates and the bq27531 and bq24192 chipset for 4.5A charge rates give designers greater flexibility by having the gauge control the charger directly, added TI. This autonomous battery management system claims to reduce software overhead, improve battery safety and security, provide better thermal management and allow a designer to adapt the charging algorithm to support different platforms and newer higher capacity batteries.

A Li-ion fast-charge development kit is available, which features the bq27531 fuel gauge directly communicating with the bq24192 charger via an I2C interface. Input operating range for the evaluation kit is 4.2-10V.

The bq27530 and bq27531 battery fuel gauges with charger control are available in a 2 x 1 x 0.65mm, 15-pin wafer chipscale (WCSP) package, and are priced at $2.07 in 1,000-unit quantities. The bq24192 4.5-A battery charger comes in a 24-pin, 4 x 4mm QFN package and is priced at $2.50 in quantities of 1,000. The bq24160 dual-input 2.5A charger comes in a 24-pin QFN package and a 2.8 x 2.8mm, 49-ball WCSP package, and is priced at $2.50 in 1,000-unit quantities.

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