TI unveils transmitter circuit with foreign object detection for Qi wireless charging stations

Integrated WPC 1.1-compliant controller cuts component count in half, gives smartphone users greater flexibility to charge from 5-V or 12-V charging stations

News provided by

Texas Instruments

Jan 21, 2014, 09:05 ET

DALLAS, Jan. 21, 2014 /PRNewswire/ -- Texas Instruments (TI) (NASDAQ: TXN) today introduced its next-generation wireless power transfer circuit with foreign object detection that will allow designers to bring to market 3-coil, 5-V and 12-V A6 charging stations compliant with the Wireless Power Consortium (WPC) 1.1 specification. The bq500412 controller, which is shipping in volume production, requires half the components compared to other solutions. To order samples and a development kit, visit: www.ti.com/bq500412-pr.

Giving smartphone users an improved charging experience, the bq500412 integrates all functions required to control wireless power delivery from the charging station to a receiver circuit used in a Qi-enabled smartphone or other device. In addition to 12-V charging pads, the circuit can be combined with a boost converter to create a 3-coil, 5-V USB charging pad, while taking advantage of a Dynamic Power Limit™ feature to ensure quality operation independent of the power capability of the port. The bq500412 also supports an enhanced foreign object detection scheme, which makes it easier for designers to implement the requirements of the WPC 1.1 specification.

Features and benefits of bq500412:

Complete WPC 1.1 Qi-compliant design for 12-V, A6 charging stations with a minimum 70-mm by 20-mm: bq500412 needs minimal components, including a CSD97374 power stage integrated circuit.
Foreign object detection, as mandated by the WPC 1.1 specification, comes standard on the controller, which features an improved algorithm with greater accuracy of error sensing.
Intelligent power delivery: TI's Dynamic Power Limit technology allows the transmitter to work from either a USB port or low-power adapter.

TI and wireless power
TI's wireless power management products and support fuel design engineers' imaginations to develop innovative, efficient wireless charging capabilities for smartphones, tablets and other portable electronics, and design wireless power charging transmitters ranging from stand-alone charging pads to those embedded in cars and furniture. The company is the leading developer of power integrated circuits that support WPC's Qi standard. TI also is a member of the Alliance for Wireless Power (A4WP) and Power Matters Alliance (PMA).

Availability and pricing
The new bq500412 wireless power transmitter, which is available in volume production through TI and its worldwide network of authorized distributors, comes in a 48-pin, 7-mm by 7-mm QFN package with a suggested resale price of US$2.93 each in 1,000-unit quantities.

Find out more about TI's wireless power solutions, application notes and evaluation modules:

Download a white paper to learn about different wireless power design requirements, including the differences between WPC, A4WP and PMA.
Order the new bq500412EVM-584 evaluation module and download an application schematic to get started on Qi-compliant wireless power transmitter design.
Video of TI's wireless power demonstrations at CES2014 in Las Vegas.
Join the TI E2E™ Power Community to ask questions and help solve problems with fellow engineers.

TI analog for consumer electronics
TI's broad range of power management and analog signal chain products offers design engineers the high performance, low power and integration they need to create innovative and differentiated consumer electronics. TI is engineering the future with gesture recognition, touch feedback, advanced battery charging, audio, health technology and more. Learn how analog products improve how we live, work and play with TI Analog Solutions for Consumer.

About Texas Instruments
Texas Instruments Incorporated (TI) is a global semiconductor design and manufacturing company that develops analog ICs and embedded processors. By employing the world's brightest minds, TI creates innovations that shape the future of technology. TI is helping more than 100,000 customers transform the future, today. Learn more at www.ti.com.

Trademarks
TI E2E, Dynamic Power Limit and bqTESLA are trademarks of Texas Instruments. All registered trademarks and other trademarks belong to their respective owners.

SOURCE Texas Instruments