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High current output chipset for free positioning wireless charging

Toshiba Electronics Europe has launched a free positioning wireless charging chipset consisting of a high efficiency power transmitter and receiver for charging smartphones and other mobile products anywhere on the battery charging pad.

The new chipset is fully compliant with the Wireless Power Consortium Qi interface specification, A4, A8, A12 and A14. It includes the TB6865FG power transmitter and TB6860WBG receiver and features a two coil control architecture for cost effective battery charging.

The position of a mobile device is detected by the TB6865FG and only one of the coils is energised for charging, thereby preserving efficiency and allowing product freedom of placement.

As a result, Toshiba says end users can place a Qi capable mobile product on a Qi compliant charging surface and achieve up to 74% better efficiency across a majority of the charging area. In addition, the design flexibility of the TB6865FG is said to allow the control of two coils, so two mobile products can be charged simultaneously.

The new chipset is built with the company's microcontroller and analogue ic technology and features high levels of integration to reduce component count, board space and cost in wireless charging applications.

The TB6865FG transmitter integrates both microcontroller and analogue elements including pwm circuitry, switching control, on board filter and a pre-driver circuit. The TB6860WBG receiver combines modulation and control circuitry with a rectifier power pickup, built in high performance dc/dc buck converter and protection functions.

The TB6860WBG offers a programmable charging profile via I2C control. The latter provides an integrated dc/dc converter for high efficiency, high current charging with a charge current of up to 1.2A. Integrated protection for the receiver ic covers input voltage, output current, over temperature conditions and metal detection.

The TB6865FG is supplied in a LQFP100 14 x 14mm package while the TB6860WBG is supplied as a WCSP39 4.29 x 2.69mm device.

Laura Hopperton

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