STMicroelectronics has launched the STUSB4531, a hybrid USB Power Delivery (PD) sink controller designed to simplify the creation of full-feature USB-C sink devices for high-end applications. Its patented hybrid mode allows optional USB PD features to be integrated easily into USB-powered or USB-chargeable products.
The STUSB4531 combines a certified, hardwired USB PD protocol stack with ST’s AUTORUN algorithms, enabling autonomous power negotiation, monitoring, and management without requiring software. This makes it easier to develop VBUS-powered or battery-operated devices such as portable audio systems, wearables, set-top boxes, wireless access points, medical equipment, and smart lighting.
Recent algorithm updates allow optimized power delivery from AC adapters, including adjustable voltage supply (AVS) and fast-charging capabilities for devices with depleted batteries.
The hybrid mode also lets an external processor communicate with the PD stack to leverage advanced USB PD features, such as battery messaging, data-role swaps, Alternate modes, and vendor-defined messaging (VDM), while keeping software complexity low and accelerating development.
By handling power negotiation and protocol management in hardware, the STUSB4531 ensures fast and reliable USB PD communication with minimal involvement from the host microcontroller. Its lightweight software layer supports customization and feature expansion without affecting system design.
Applications include devices that combine USB power and data, such as portable drives, point-of-sale terminals, printers, drones, and industrial devices. VR headsets, infotainment systems, portable displays, and gaming consoles can also use Alternate modes like DisplayPort or Thunderbolt, while VDM enables product differentiation in consumer and medical devices.
With its fast hardware design and flexible software, the STUSB4531 promotes broader adoption of USB-C for powering and charging devices and supports global eco-design goals by reducing electronic waste. It complies with USB-C 2.4, USB PD 3.2, and IEC 62680 standards.
ST offers a full development ecosystem, including evaluation boards (EVAL-SCS007V1, EVAL-SCS006V1), software tools (STSW-STUSB020 GUI, STSW-STUSB021 NVM flasher), and an upcoming open-source library (STSW-STUSB022). The STUSB4531 is available in a 3mm × 3mm QFN16 and 2.3mm × 2.3mm CSP16 package. More details are available on ST’s website.
