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TI IC tailored for portable apps

Posted: 01 Apr 2005 ?? ?Print Version ?Bookmark and Share

Keywords:texas instruments? ti? ic? power management ic? power management?

Texas Instruments Inc. (TI) announced a highly integrated charge and power management device that combines a single-cell Li-ion USB/AC charger with a high efficiency, synchronous dc-dc power converter. The simple-to-design IC supports a wide range of space-limited portable applications, such as Bluetooth headsets and accessories, said TI.

The bq25010 integrates a power FET and current sensor to deliver up to 500mA, while the USB charge control limits the USB current to 100mA or 500mA. It also gives portable designers the ability to charge a battery either from the AC adapter or USB with autonomous power source selection.

The new chip incorporates a 100mA step-down dc-dc converter for high power efficiency. Under nominal load current, operating at a fixed switching frequency of 1MHz, the device achieves up to 95 percent conversion efficiency. At lighter load currents, it enters a "power save mode" with reduced switching frequency and a minimum quiescent current to maintain high efficiency. The converter also operates directly from the battery and regulates the output voltage, even when the input supply is removed.

The bq25010 has an adjustable output voltage of 0.7V to 4.2V. Another family member, the bq25012, comes with a fixed output voltage of 1.8V. Both devices are packaged in a 3.5-by-4.5mm QFN package, and are priced at $2.20 each in quantities of 1,000 units.




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