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Minus the plug: Receiver, transmitter allow faster charging

20 Nov 2014

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Here's something designers of industrial, medical and personal electronics will find interesting: a solution that promises to charge devices faster and more efficiently, while getting rid of all connectors.

Developed by Texas Instruments, the integrated 10W wireless charging receiver and corresponding transmitter, bq51025 and bq500215 respectively, provide a faster, cooler charge to one- and two-cell (1S and 2S) Li-Ion batteries. The charging solution is also compatible with any 5W Qi-compliant product in the market, allowing consumers the flexibility to charge in more places.

The bq51025 receiver supports a programmable output voltage ranging from 4.5V to 10V, and achieves up to 84 per cent charging efficiency at 10W when paired with TI's bq500215 wireless power transmitter. The fully contained wireless power receiver solution measures only 3.60mm x 2.89mm, and can be designed into many portable industrial designs, ranging from point-of-sale scanners to handheld medical diagnostic equipment, and personal electronics, such as tablets and ultra-books.

TI bq51025

The bq51025 functional diagram. (Source: TI)

The new 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 (FOD) method that detects objects before any power is transferred, and actively reduces power if excessive loss is detected.

TI bq500215

The bq51025 functional diagram. (Source: TI)

Qi-compliant communications and control ensures compatibility with any Wireless Power Consortium Qi-certified transmitter or receiver up to 5W. 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.

Both devices will be compatible with TI's future medium power Qi-compliant transmitters and receivers. They are available now in volume production. The bq51025 comes in a 42-ball, 3.6mm x 2.9mm x 0.5mm chip scale package and is priced at $4 in 1,000-unit quantities, while the bq500215 is housed in a 9mm x 9mm package, and costs the same as the bq51025.

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