Product category:
Power Supply ICs and Controllers
News Release from: Texas Instruments (April 2001-March 2006) | Subject: bq25010
Edited by the Electronicstalk Editorial
Team on 01 April 2005
Single-chip battery charger is smallest
yet
Highly integrated charge and power management device combines a single-cell Li-ion USB/AC charger with a high efficiency, synchronous DC/DC power convertor.
Texas Instruments has 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 convertor The simple-to-design integrated circuit (IC) supports a wide range of space-limited portable applications, such as Bluetooth headsets and accessories
This article was originally published on Electronicstalk on 8 Nov 2004 at 8.00am (UK)
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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 500mA, while the USB charge control limits the USB current to 100 or 500mA.
The bq25010 also incorporates a 100mA step-down DC/DC convertor 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 convertor 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 50mW stereo headphone driver, TPA6100A2.
The amplifier supports an input voltage range of 1.6 to 3.6V, offering a low supply current of 0.75mA and shutdown current of only 50nA.
The TPA6100A2 amplifier also provides excellent audio quality by achieving total harmonic distortion plus noise as low as 0.04% at 1kHz.
The bq25010 integrated charger is in volume production from TI and its authorised distributors.
The bq25010 has an adjustable output voltage of 0.7 to 4.2V.
Another family member, the bq25012, comes with a fixed output voltage of 1.8V.
Both devices are packaged in small, 3.5 x 4.5mm QFN packages, and are priced at $2.20 each in quantities of 1000 units.
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