STMicroelectronics STWBC-MC wireless battery-charger transmitter

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The STMicroelectronics STWBC-MC 15 W wireless battery-charger transmitter can control multiple charging coils, making charging less dependent on the precise position of the battery-powered device.

Compliant with the latest Qi 1.2.4 specification, the transmitter is specifically designed to support the Qi MP-A15 EPP (Extended Power Profile) topology. In addition to detecting a valid receiver and selecting the most efficient coil for power transfer, it ensures extended foreign object detection (FOD) through bidirectional communication with the receiver. The product also supports the proprietary wireless fast-charge extensions of leading smartphone manufacturers.

To ensure fast and stable charging for all types of devices, the transmitter monitors coil current and voltage. By integrating a digital DC-DC controller, it delivers the required power to the coil at a fixed frequency and so minimises interference with other systems inside smartphones and tablets. Given the EU’s intention to extend the scope of the Radio Equipment Directive (RED) to include wireless-charging transmitters and restrict H-field emissions above 145 kHz to -5 dBm, the unit’s low-EMI design eases compliance.

ST’s triple-path modulation technique for communication between the transmitter and receiver increases noise immunity and the IC’s low standby consumption minimises wasted energy when not charging.

For more information: www.st.com/wbc.