Standalone autopowered USB-C controller for 5V charging

March 19, 2020 //By Nick Flaherty
The STUSB4500L from STMicroelectronics has developed an autopowered USB-C controller for pure 5V sink-only applications.
The STUSB4500L from STMicroelectronics has developed an autopowered USB-C controller for pure 5V sink-only applications.

STMicroelectronics has developed an autopowered USB-C controller for pure 5V sink-only applications.

The STUSB4500L is a small-footprint USB-C controller designed and certified for pure 5V sink-only applications. All the mandatory features to use the USB-C connector as a 5V universal power plug are integrated, allowing designers to implement USB-C charging solutions quickly and easily without studying the standard or writing code.

USB-C is rapidly becoming established as a replacement for Micro-B or Mini-B plugs, for both power and data connections, as it offers the advantages of reversible orientation and greater robustness with up to 10,000 connect/disconnect cycles.

The USB-C controller is aimed at low-voltage applications such as Bluetooth speakers, computer accessories, Wi-Fi access points, point-of-sale equipment, LED lighting, and USB dongles. It can also be used for powering equipment such as single-board computers and hardware development kits. The controller IC runs without additional code and requires no external support from the microcontroller, which eases adoption of the USB-C connector standard by saving time-consuming design work.

The STUSB4500L is auto-powered via VBUS from the connected source and does not need to be supplied from a local battery or on-board power. Zero leakage current prevents draining the battery when not charging. Input over-voltage protection prevents low-voltage equipment being damaged if it is incorrectly connected, for example, to a 20V source from a USB PD AC adapter rather than the required 5V supply.

The USB-C controller includes ‘dead-battery’ support to ensure correct identification by the source when the battery is fully discharged as well as true cold-socket implementation which keeps the VBUS switch open by default until safe 5V input power is supplied. There is also source power-budget identification and error-recovery support to ensure correct re-starting when a fault is triggered.

The STUSB4500L is in production now, in a choice of 4mm x 4mm QFN-24 package or 2.6mm x 2.6mm CSP-25 chip-scale package, priced from $0.70 and $0.75 respectively for orders of 1000 pieces.

Next: Prototyping


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