Texas Instruments Inc. (TI, Dallas, TX) announced its new bq25010, a highly integrated charge and power management device that combines a single-cell lithium-ion USB/ac charger with a high-efficiency, synchronous dc-dc power converter. The integrated circuit (IC) supports a wide range of space-limited portable applications, such as Bluetooth headsets and accessories.
The new bq25010 device gives portable designers the ability to charge a battery either from the ac adapter or USB with autonomous power source selection. The IC integrates a power FET and current sensor to deliver up to 500 mA, while the USB charge control limits the USB current to 100 mA or 500 mA. The bq25010 also incorporates a 100 mA step-down dc-dc converter for high power efficiency. Under nominal load current, operating at a fixed switching frequency of 1 MHz, the device achieves up to 95% 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 integrated charger is in volume production. The bq25010 has an adjustable output voltage of 0.7 V to 4.2 V. Another family member, the bq25012, comes with a fixed output voltage of 1.8 V. Both devices are packaged in a small, 3.5 mm x 4.5 mm QFN package, and are priced at $2.20 each in quantities of 1,000 units.