Achieve 84% efficiency for 10W wireless charging

20th November 2014
Posted By : Barney Scott
Achieve 84% efficiency for 10W wireless charging

Texas Instruments provides a more efficient charging solution with what is claimed to be the industry’s first integrated 10W wireless charging receiver and corresponding transmitter. The bq51025 and bq500215 enable waterproof and dustproof portable designs and provide a faster, cooler charge to one- and two-cell (1S and 2S) Li-Ion batteries.

The bq51025 receiver supports a programmable output voltage of 4.5-10V and achieves up to 84% charging efficiency at 10W when paired with TI’s bq500215 wireless power transmitter, significantly improving thermal performance. The fully contained wireless power receiver solution measures only 3.60x2.89mm, and can be integrated into many portable industrial designs, ranging from POS scanners to handheld medical diagnostic equipment, and personal electronics, such as tablets and ultra-books.

The bq500215 is a dedicated, fixed-frequency 10W wireless power digital controller transmitter compatible with 5W Qi receivers. The transmitter features an enhanced foreign object detection method that detects objects before any power is transferred, and actively reduces power if excessive loss is detected. The wireless charging solution’s I2C communications interface allows better alignment of the receiver on the transmitter surface, as well as ability to send proprietary packets of data between the receiver and transmitter.

The charging solution is also compatible with any 5W Qi-compliant product in the market, allowing consumers the flexibility to charge in more places than ever before. Both devices will be compatible with TI’s future medium power Qi-compliant transmitters and receivers.

The bq51025EVM-649 wireless power receiver evaluation kit helps designers evaluate the operation and performance of the bq51025. The bq500215EVM-648 wireless power transmitter evaluation module provides all the basic functions of a Qi-compliant, wireless charger pad. The 12V input, single coil transmitter enables designers to speed time to market.

The bq51025 receiver and bq500215 transmitter are available in volume production. The bq51025 comes in a 42-ball, 3.6x2.9x0.5mm chip scale package and is priced at $4.00 in 1,000 unit quantities. The bq500215 comes in a 9x9mm package and is priced at $4.00 in 1,000 unit quantities.

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