STWBC-WA charging-transmitter controller and STWLC04 wireless battery-charger receiver

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A miniaturised wireless battery-charging chipset from STMicroelectronics saves space, simplifies enclosure design and sealing, and accelerates time to market for ultracompact sports wearables, wellness monitors, medical sensors and remote controllers.

The combination of ST’s STWBC-WA charging-transmitter controller and STWLC04 wireless battery-charger receiver enables power transfers up to 1 W with 11 mm-diameter coils on the receive side and 20 mm for the transmitter, enabling tinier, slimmer form factors. Power-transfer capability can be increased to 3 W by using larger coils and a full-bridge circuit on the transmitter side. Eliminating any need for a conventional charging connector simplifies enclosure design and eases sealing to prevent contamination by dirt or moisture.

The fully featured chipset supports wireless charging for Li-ion or Li-polymer battery chemistries and includes safety mechanisms such as foreign-object detection (FOD), active transmitter-presence detection and receiver thermal protection.

 The transmitter chip has integrated drivers and native support for half-bridge and full-bridge topologies. It comes with an easily configurable firmware option for a quick turnkey solution or customised applications. The receiver supports direct battery charging, which allows smaller circuit-board size. It features a 32-bit microcontroller core, an efficient buck converter with synchronous rectification and integrated drivers.

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