TI Battery Charger and DC-DC Converter

Texas Instruments’ bq25010 is 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 supports a wide range of space-limited portable applications, such as Bluetooth headsets and accessories.

The 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 500mA, while the USB charge control limits the USB current to 100mA or 500mA. The bq25010 also 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% 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 is in volume production. It 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 come in a 3.5mm x 4.5mm QFN package and are priced at $2.20 each in quantities of 1,000 units.

For more information, visit www.ti.com