Wireless charging receiver offers dual-battery functionality

06 February 2018

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One of STMicroelectronics' (ST) Wireless Power Transfer solutions, the STWLC33, is an integrated, multi-mode wireless power-receiver solution optimised for portable high-speed chargeable applications – up to 15W.

The dual-mode receiver operates with both the Wireless Power Consortium’s (WPC) Qi 1.2 and PMA-SR1 AirFuel inductive wireless standard communication protocols, enabling it to quickly start charging mobile devices regardless of protocol.

The ST STWLC33 inductive wireless power receiver, available from Mouser Electronics (links to product page), greatly simplifies the implementation of dual-function handheld devices and provides an improved user experience, faster wireless charging, and outstanding total system efficiency over other solutions.

The STWLC33 is also the only 15W receiver from ST that is capable of acting like a 3W transmitter, using the same coil to provide power to another receiver: users can charge one device wirelessly while also using that same device to charge another. In addition, the product is one of the first wireless receivers on the market that is capable of providing an output voltage that can charge two-cell lithium-ion batteries.

At the core of the STWLC33 is a 32-bit, 32 MHz Arm Cortex-M microcontroller with 32 Kbytes of firmware/read-only memory (ROM) memory and 8 Kbytes of RAM. The device delivers a total system efficiency of up to 80 percent and low power dissipation, through features such as its integrated low impedance synchronous rectifier and low drop-out linear regulator.

The ST STWLC33 inductive wireless power receiver

Moreover, the receiver offers patented features that help enhance user experience, including active presence detection to wake the system quickly when a compatible object is presented for charging, and special functionality to enhance the performance of foreign object detection (FOD) to cut power and prevent overheating. Other features include a 32 MHz PWM timer, eight-channel analog-to-digital converter (ADC), and configurable general-purpose inputs and outputs (GPIOs).

ST’s STWLC33 inductive wireless power receiver is ideal for very compact wireless applications, including tablets, power banks, phones, medical equipment, and wearable devices. Designers can also combine the STWLC33 receiver with the STWBC-EP wireless charging controller transmitter to complete their high-speed chargeable devices. The STWLC33 is supported by the STEVAL-ISB042V1 evaluation board, which includes STWLC firmware that allows engineers to modify parameters and settings to ensure proper integration of the STWLC33 power receiver into the final application.

To learn more, visit this link from Mouser Electronics.

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