Wireless charging is fast becoming the ideal platform for charging mobile devices. With the onset of 5G communications and the demand for higher power and efficiency, manufacturers are looking for new wireless charging ICs that can handle those demands. To that end, STMicroelectronics has introduced a new wireless charging IC for upcoming technologies. generation of those manufacturers.
The company’s STWLC68 IC enables fast power transfer and power sharing via FOD (Foreign Object Detection), which can function as a power transmitter and receiver, managing up to 5W of output power.
Because the STWLC68 offers a maximum power input of 5W, the device only supports a baseline power profile as illustrated. Image used courtesy of STMicroelectronics
In addition to a built-in 27V synchronous rectifier with 98% efficiency (typical), the device also features a low-dropout linear regulator with input voltage and output current control loops.
Additional features of the STWLC68 include: Six configurable GPIO 8-channel / 10-bit AD converter 400 kHz I2C interface Output overvoltage clamping protection On-chip thermal protection and management (overvoltage / overcurrent) Enhanced power dissipation capability Chip-Scale Package (CSP) STMicroelectronics claims that the chip can be accessed via I2C and its modified and custom parameters for custom settings to meet any wireless charging application. Once the parameters have been set, they can be saved to the chip’s OTP memory and automatically recalled upon power-up, allowing the STWLC68 to act as a standalone device.
Block diagram of STWLC68. Image used courtesy of STMicroelectronics
The STWLC68 is designed to support Qi 1.2.4 inductive protocol and BPP (Base Power Profile), making it compatible with all Qi devices on the market.
Availability and support tools
STMicroelectronics’ STWLC68 Wireless Charging IC is available now, along with a pair of evaluation boards, STEVAL-ISB68RX and STEVAL-ISB68WA. The STEVAL-ISB68RX and STEVAL-ISB68WA are designed for rapid prototyping for 5 standard applications. PCBA-sensitive 2.5W low-power applications, respectively.