Rapid 50W Qi Wireless-Charging IC For Electronic Devices

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It is quipped with efficient power delivery and accurate current delivery systems that allow high-power charge-sharing mode

Safe, wireless delivery of high power to charge personal electronics must address a range of challenges including efficiency, reliable communication, Foreign Object Detection (FOD) and thermal, over-voltage, and over-current protection.

Here’s introducing a fast Qi wireless charging IC, the STWLC88 that delivers as much as 50W of power (2x faster than the previous-generation device), enabling smartphones, tablets, laptops and other personal electronic devices to charge without cables in a safe, quick and efficient way.

With a fully integrated ultra-low impedance, high-voltage synchronous rectifier and low drop-out linear regulator, the STWLC88 achieves high efficiency and low power dissipation, critical for applications that are highly sensitive to unnecessary heat buildup. The power-charger chip features dedicated hardware and advanced algorithms that address challenges in ASK and FSK communication during high power delivery.

Moreover, the STWLC88 comes with highly accurate Foreign Object Detection (FOD) and an integrated accurate current-sensing system to ensure high power delivery is performed safely and in a controlled manner.

The STWLC88 can also operate in high-efficiency transmitter mode to allow high-power charge-sharing mode, coupled with the Q factor detection in a receiver device to ensure safe operation and protection to end-users.

An I2C interface allows firmware and platform developers to customise parameters in the device. The configuration can be programmed into the embedded FTP, which allows for more than 1000 times of re-programming. Additional firmware patching improves the IC’s application flexibility.

Addressing efficient charging challenges

The Qi wireless power-transfer system addresses challenges beyond the standard with hardware, cutting-edge signal processing algorithms and proprietary ST SuperCharge (STSC) protocol.

The STWLC88 incorporates multiple circuits that substantially reduces the external BoM (Bill of Materials), making it ideal for medium- to high-power wireless-charging applications and integration in a wide range of applications with restrictive PCB area requirements. Being WPC Qi 1.2.4 EPP compliant, the STWLC88 is fully compatible with all Qi EPP certified transmitters in the market.

“With the launch of the STWLC88 wireless-charging IC, ST has expanded the portfolio to cover a wide range of power levels to meet the increasing demand for higher-power chargers in the age of 5G communications,” said Francesco Italia, General Manager, Analog Custom Products Division, STMicroelectronics.

The STWLC88 is in production and available in a 4.0mm x 4.5mm x 0.6mm WLCPS 110-bumps 0.4mm pitch package. The STEVAL-ISB88RX evaluation board, containing the STWLC88 and a sophisticated GUI, is also available to simplify prototyping and significantly cut time to market with the 50W charger IC.

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