Date: 16/09/2012

Wireless power transmitter for USB-connected charging pads

Texas Instruments (TI) has introduced wireless power transfer controller IC for Qi-compliant charging pad from any USB port or 5-V power adapter.

Designed for 5-V systems, the transmitter circuit allows the charging pad to safely engage with a Wireless Power Consortium (WPC) Qi-compliant device, such as a smartphone or other portable electronics device, receive packet communication and efficiently manage the power transfer. The bq500211 also features TI’s Dynamic Power Limit feature to optimize available power from a limited power source.

Features and benefits of bq500211 as per TI:
• Enhanced user experience: First integrated transmitter circuit to allow consumers to plug a wireless power pad into any USB port or 5-V power system.
• Intelligent control of wireless power transfer: TI’s Dynamic Power Limit technology optimizes available power from limited input supplies.
• Saves board space: The circuit can operate as a WPC A5 transmitter with a magnetic positioning guide or as an A11 transmitter without the need of a magnet.
• Fault detection for more reliable operation: Comprehensive charge status mode and fault indication features alert the user of any abnormal condition during power transfer.

Availability and pricing: The new bq500211 wireless power transmitter comes in a 48-pin, 7-mm by 7-mm QFN package with a suggested resale price of US$3.95 each in 1,000-unit quantities. The bq500211 is available in volume production through TI and its worldwide network of authorized distributors.