Easy to Design, Highly Efficient bq25010 Integrates USB/AC Charge Management and Low-Power DC/DC
TI's 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 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.
In addition to the integrated battery charger, Bluetooth headset designers can take advantage of longer talk time using TI's 50-mW stereo headphone driver, TPA6100A2. The amplifier supports an input voltage range of 1.6 V to 3.6 V, offering a low supply current of 0.75 mA and shutdown current of only 50 nA. The TPA6100A2 amplifier also provides excellent audio quality by achieving total harmonic distortion plus noise as low as 0.04 percent at 1 kHz.
The bq25010 integrated charger is in volume production from TI and its authorized distributors. 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. Evaluation modules, application notes and TI's VIP selection tool are available through http://power.ti.com/ .
Texas Instruments Incorporated provides innovative DSP and analog technologies to meet our customers' real world signal processing requirements. In addition to Semiconductor, the company's businesses include Sensors & Controls, and Educational & Productivity Solutions. TI is headquartered in Dallas, Texas, and has manufacturing, design or sales operations in more than 25 countries. Texas Instruments is traded on the New York Stock Exchange under the symbol TXN. More information is located on the World Wide Web at http://www.ti.com/ .
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