Texas Instruments (TI) introduced its next-generation wireless power transfer circuit to support the Wireless Power Consortium (WPC) 1.1 specification. The bq500212A transmitter, which is shipping in volume production, requires one-third fewer components than competitive solutions. The circuit allows designers to quickly take to market Qi-compliant wireless charge pads or stations that can operate from a USB port or 5-V power adapter.
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 like 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.
· Complete WPC 1.1 Qi-compliant design: bq500212A needs only five components, including two new CSD97376 Power Stage integrated circuits; while other products may require up to 15 devices.
· Intelligent power control: TI'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 <100 mW of standby power with no receiver on the pad and <50 mW once the receiver has finished charging.
· Hybrid capacitor scheme significantly reduces system bill of materials 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 new 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.