STMicroelectronics STWLC99 wireless power receiver

STMicroelectronics has launched a wireless power receiver with a power rating of 100 watts. The STWLC99 device provides a fast wireless charging time and can also recharge high-end smartphones in less than 30 minutes.

In addition to enhancing user convenience, high-power wireless charging lets designers create industrial products that are free of power sockets and cords, which can deliver various advantages. Eliminating the charging socket can save space and allow sealing against water or dust ingress in challenging environments. Complications due to twisting or tangling of the cord can be avoided. Independently mobile devices such as robots and drones can recharge without a mechanism or human intervention to connect the cable.

Housed in a 4.859 x 4.859 mm wafer-level chip-scale package (WLCSP), the wireless power receiver is in production now. With an energy-efficient architecture comprising a synchronous rectifier with MOSFETs of low RDS (on) and a low-dropout regulator, the wireless power receiver directs the received energy to the charging battery with minimal loss and low thermal dissipation.

Compliant with Qi 1.2.4 and 1.3, it supports the Qi Extended Power Profile (EPP) and leverages ST’s optimised STSuperCharge (STSC) protocol for fast charging. The battery charging power reaches up to 100 W when combined with ST’s STWBC2-HP transmitter solution.

The wireless power receiver contains non-volatile memory for storing configuration parameters and provides an I2C interface for exchanging configuration data and charging control. A comprehensive set of safety features is built in, including foreign object detection with accurate current sensing, Q-factor detection in transmit mode, and overcurrent, overvoltage and thermal protection. The wireless power receiver is also capable of operating as a power transmitter up to 25 W for charging other devices.