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Wireless power receiver pushes mobile charging

Posted: 21 Nov 2012 ?? ?Print Version ?Bookmark and Share

Keywords:wireless power receiver? bqTESLA? bq51050B? WPC? Ethernet?

Texas Instruments Inc. (TI) has announced what it says is its first single-chip wireless power receiver with integrated battery charger. It also features a "free-position" transmitter IC that according to the company expands the charge area by 400 per cent. The two bqTESLA circuits give smartphone users a simpler, stress-free charging experience and help designers implement wireless power technology in places such as automotive consoles, charging pads and office furniture, added the company.

TI indicated that the bq51050B is the industry's first Wireless Power Consortium (WPC) 1.1 Qi-compliant wireless power receiver with integrated direct battery charger, and enables faster, more efficient charging of smartphones, wireless keyboards and other portable electronics. The 20V receiver combines rectification, voltage conditioning, communication control and Li-ion charging capability in a single, tiny ICeliminating the need for a separate battery charger circuit. The inductor-free, single-stage design delivers the industry's highest system efficiency and saves up to 60 per cent board space compared to a multi-stage implementation.

In addition to the receiver, TI's bq500410A touts WPC 1.1-ready wireless power transfer controller to support A6 transmitters. The controller allows a Qi-compliant smartphone or other portable device to charge in a surface area of at least 70 x 20mm, 400 per cent larger compared to today's 18 x 18mm "bull's-eye" charge space. The bq500410A achieves greater than 70 per cent efficiency, and relies on a unique parasitic metal and foreign object detection feature to safely protect the system and stop delivering power if a metal object is detected between the transmitter and receiver, noted TI.

Wireless power is an emerging technology that creates a better charging experience for consumers, just as WiFi replaced the need to use an Ethernet cable for Internet connectivity.

The bq51050B comes in a 1.9 x 3mm WCSP package or 4.5 x 3.5mm QFN, and is priced at $2.75 in 1,000-unit quantities. A bq51051B version with 4.35V charge voltage is available. The bq500410A comes in a 48-pin, 7 x 7mm QFN package, and is priced at $3.18 in 1,000-unit quantities.





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