by Anton Shilov
11/07/2012 | 12:11 PM
Texas Instruments has introduced its first single-chip wireless power receiver with integrated battery charger and a new "free-position" transmitter integrated circuit, which expands the charge area by 400%. Two bqTesla chips give smartphone users a simpler experience and help designers implement wireless power technology in more places, such as automotive consoles, charging pads and office furniture.
TI's 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 unique 20V receiver combines rectification, voltage conditioning, communication control and Li-Ion charging capability in a single, tiny integrated circuit, – eliminating 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% board space compared to a multi-stage implementation.
In addition to the receiver, TI's bq500410A is the first 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 70mm by 20mm, 400% larger compared to today's 18mm by 18mm "bull's-eye" charge space. The bq500410A achieves greater than 70% 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.
TI's receivers and bq500410A transmitter ICs are included in the new Nokia Lumia 920 and Nokia Lumia 820 smartphones and wireless charging accessories, such as the Nokia BH-220 Bluetooth headset and DT-38 cradle, JBL PowerUp Wireless Charging Speaker docking station with built-in NFC, and the Nokia Wireless Charging Pillow by Fatboy.
The bq51050B comes in a 1.9mm by 3.0mm WCSP package or 4.5mm by 3.5mm QFN, and is priced at $2.75 in 1000-unit quantities. A bq51051B version with 4.35V charge voltage is available. The bq500410A comes in a 48-pin, 7mm by 7mm QFN package, and is priced at $3.18 in 1000-unit quantities.