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Wireless power chip eases dev't of Qi charging stations

Posted: 13 Sep 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Qi charging? wireless charge pads? WPC?

Texas Instruments (TI) has rolled out its next-generation wireless power transfer circuit to support the Wireless Power Consortium (WPC) 1.1 specification. The bq500212A transmitter requires one-third fewer components than competitive solutions, stated the company. It also allows designers to quickly take to market Qi-compliant wireless charge pads or stations that can operate from a USB port or 5V power adapter, the firm added.

With more Qi charging stations available in the marketplace, consumers of Qi-enabled smartphones, smartwatches and many other "enclosed" portable consumer electronics will be able to keep their batteries charged longer. Products such as the Kickstarter-born AGENT Smartwatch are using TI's bqTESLA wireless power products including the bq500212A and a bq51050B receiver, to ensure wireless power capability.

According to TI, bq500212A needs only five components, including two CSD97376 Power Stage ICs while other products may require up to 15 devices. The company's Dynamic Power Limit technology enables the transmitter to work from either a USB port or low-power adapter. The device's standby mode ensures The hybrid capacitor scheme of the circuit, the company said, significantly reduces system BOM cost by using a combination of X7R and COG capacitors instead of only relying on COG capacitors. Foreign Object Detection, as mandated by the WPC1.1 specification, comes standard on the bq500212A, which features an improved algorithm with greater accuracy of error sensing.

The bq500212A wireless power transmitter comes in a 48-pin, 7-mm by 7-mm QFN package with a suggested resale price of US$2.78 each in 1,000-unit quantities. The bq500212A is available in volume production through TI and its worldwide network of authorised distributors.





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