Summary of STMICROELECTRONICS INTRODUCES STANDALONE VBUS-POWERED CONTROLLER FOR 5V USB-C CHARGING APPLICATIONS
The STUSB4500L is a compact, standalone USB-C controller IC from STMicroelectronics for pure 5 V sink-only applications. It integrates all required features for using USB-C as a universal 5 V power plug without code or extra MCU support, enabling quick implementation in low-voltage devices. Auto-powered from VBUS, it provides zero leakage, input over-voltage protection, dead-battery support, cold-socket behavior, source power-budget identification, and error-recovery to simplify safe USB-C charging designs.
Parts used in the STUSB4500L Project:
- STUSB4500L USB-C controller IC
- USB-C connector
- VBUS supply (connected source)
- Optional VBUS switch (internal behavior described)
- Low-voltage application load (e.g., Bluetooth speaker, USB dongle)
The STUSB4500L from STMicroelectronics is a small-footprint addition to the Company’s USB-C controller IC family designed and certified for pure 5 V sink-only applications. All mandatory features to use the USB-C connector as a 5 V 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 – up to 10,000 connect/disconnect cycles.
ST’s new USB-C controller IC is a stand-alone, plug-and-play interface product, targeting 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 20 V source from a USB PD AC adapter rather than the required 5 V supply.
Further features include ‘dead-battery’ support to ensure correct identification by the source when the battery is fully discharged, true cold-socket implementation which keeps the VBUS switch open by default until safe 5 V input power is supplied, source power-budget identification and error-recovery support to ensure correct re-starting when a fault is triggered.
Read more: STMICROELECTRONICS INTRODUCES STANDALONE VBUS-POWERED CONTROLLER FOR 5V USB-C CHARGING APPLICATIONS
- Can the STUSB4500L operate without external microcontroller code?
Yes, it is a stand-alone, plug-and-play interface that runs without additional code or microcontroller support. - Does the STUSB4500L require a local battery or on-board power to operate?
No, it is auto-powered via VBUS from the connected source and does not need local battery or on-board power. - What protection does the STUSB4500L provide against incorrect higher-voltage sources?
It includes input over-voltage protection to prevent damage if connected to higher voltages like a 20 V USB PD adapter. - Does the STUSB4500L draw leakage current when not charging?
No, it features zero leakage current to prevent draining the battery when not charging. - How does STUSB4500L behave with a fully discharged battery?
It offers dead-battery support to ensure correct identification by the source when the battery is fully discharged. - Does the STUSB4500L keep VBUS connected by default?
No, it implements true cold-socket behavior keeping the VBUS switch open by default until safe 5 V input is supplied. - What types of applications is the STUSB4500L targeted at?
It targets low-voltage applications such as Bluetooth speakers, computer accessories, Wi-Fi access points, point-of-sale equipment, LED lighting, USB dongles, single-board computers, and development kits. - Does the STUSB4500L assist with power budget and fault recovery?
Yes, it supports source power-budget identification and error-recovery to ensure correct restarting when a fault is triggered.
