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TI rolls out battery fuel gauge with LDOs

Posted: 31 Jan 2008     Print Version  Bookmark and Share

Keywords:battery fuel gauge  embedded  LDOs 

bq27510

Texas Instruments Inc. has introduced two new battery fuel gauge devices with integrated low-dropout regulators (LDOs) for smart phones, mobile Internet devices and media players with embedded or removable batteries. The system-side and battery pack-side fuel gauges build on TI's popular family of ICs that predict battery life with 99 per cent accuracy to extend runtime, protect data and provide a better user experience.

The bq27510 system-side battery fuel gauge with Impedance Track technology incorporates an LDO and can be powered directly from the battery cell with less external circuitry, regardless of system voltage. In addition to simplifying design of the fuel gauge into the host system, it accurately measures remaining capacity data from a device's single-cell Li-ion battery to predict remaining battery capacity under all conditions, even as a battery ages.

In addition to the system-side battery fuel gauges, TI's bq27540 resides directly on the embedded or removable battery pack to intelligently manage available power that resides in the battery. The bq27540 will support SDQ, HDQ and I²C communication protocols to allow the system to read important information from the battery.

Power optimisation
Accurate fuel gauging helps systems intelligently manage available power, alert the user of system operating-time and extend the runtime of the system as far as possible. Mobile application processors, such as TI's OMAP 3 platform with SmartReflex power and performance technologies, rely on accurate battery data to better optimise the mobile device's complete power OS. As with bq27500, the bq27510 and bq27540 chips provide accurate reserve energy warning, which allows a system to save data to non-volatile memory before the system shuts down, so work is not lost when a battery runs to empty.

The bq27510 and the bq27540 are sampling today, with volume production expected in the second quarter of 2008. Available in a space-saving 12-pin, 2.5-by-4mm SON package, both devices' suggested retail price is Rs.53.30 ($1.35) each in 1,000-piece quantities. Evaluation modules of the bq27500, bq27510 and bq27540, design application notes, user guides and TI's bqEASY software design tool are available at TI's Website.




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