Component Pricing

Faster Charging Solutions for Mobile

30 November 2017

The STWBC-EP. Image credit: STMicroelectronics.The STWBC-EP. Image credit: STMicroelectronics.Faster charging of smartphones and tablets? Yes please.

The new industry standard for faster charging is the Qj Extended Power specification, which has recently been introduced by the Wireless Power Consortium (WPC). It raises maximum charging power from 5W to 15W, enabling devices to be charged up to three times more quickly. And STMicroelectronics, a mulit-national semiconductor manufacturer, has recently introduced one of the world’s first chips (the STWBC-EP) to support it.

The new chip combines best-in-class energy efficiency with unique features created to enhance the user experience. These include patented active-presence detection technology to wake the system quickly when a compatible object is presented for charging. The technology also enhances the performance of Foreign Object Detection (FOD), which cuts power to prevent overheating if metal-containing objects are brought too close to the charger.

The chip also offers a simplified charger design, along with flexibility – it is able to work with supply voltages from 5V USB power up to 12V. It consumes just 16mW in standby and is able to wirelessly transfer more than 80 percent of total input power.

In order to accelerate time-to-market for product developers, ST has created an associated reference design with a Qi 15W ready-built transmitter board and documentation to get started. Also available is a 15W receiver chip (STWLC33) for use in high-speed chargeable devices that developers can use to complete their applications. An evaluation kit, STEVAL-ISB044V1, includes a 15W Qi MP-A10 reference design; 12V 2A AC/DC adapter; USB/UART dongle for connection to the PC and USB cable; and pre-loaded firmware. A graphical PC-based configuration tool is provided to help customize settings.

The STWBC-EP is now available as a 32-lead QFN (5mm x 5mm) device, priced from $3.175 for 1,000 pieces.

For more information on ST’s wireless charging IC transmitter and receiver solutions, click here.

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