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Dev board for 100W USB-C Fast Charging in embedded designs

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By Nick Flaherty

STMicroelectronics is aiming to drive USB-C fast charging into embedded applications with a new development board.

The latest USB-C PD chargers can have power ratings up to 100W and can optimize charging by dynamically adjusting current and voltage thanks to the USB Programmable Power Supply (PPS) feature of USB PD. A wide range of designs such as smart speakers, power tools, wearables, robots, power banks, and drones traditionally recharge at 5V through older USB micro-B or proprietary connectors. These can now use the interoperability of USB-C technology while charging faster.

To support this migration, ST has created a USB Implementers Forum (USB-IF) certified evaluation board for up to 100W PPS USB Power Sinking Devices (PSD) that helps developers accelerate new designs and supports certification of the end product.

 “Using our USB-IF-certified development board, customers can now quickly add all of the USB-C benefits and reuse a solid platform for certification of their own board, contributing to a safe and reliable USB Type-C and USB PD ecosystem,” said Ricardo de Sa Earp, Group Vice President, Microcontrollers Division General Manager, STMicroelectronics.

“The unmatched capabilities of USB PD over USB Type-C cables and connectors is driving rapid innovation in a variety of USB charging applications and markets,” said Jeff Ravencraft, USB-IF President and COO. “Inventive solutions, such as ST’s new evaluation board, are vital to support the continued growth of USB-IF-certified USB PD and USB Type-C devices that consumers can rely on.”

The certified device (USB-IF TID: 3036) combines ST’s Nucleo-G071RB and X-Nucleo-USBPDM1 development boards. The Nucleo-G071RB features an STM32G0 microcontroller, the industry’s first general-purpose microcontroller to integrate a USB Type-C Power Delivery controller on-chip, enabling greater system integration as well as the possibility to support new application use cases. The X-Nucleo-USBPDM1 board contains ST’s TCPP01-M12 companion chip for port protection.

Designers can use the tools and software of the STM32 ecosystem to complete their projects quickly and easily. This allows applications already using a microcontroller with legacy 5V USB charging can be updated to USB Type-C with only a small number of external components.

The STM32G0 MCU and TCPP01-M12 enable an efficient and economical two-chip solution capable of controlling and protecting the USB PD capable USB Type-C port as well as hosting the embedded application. The TCPP01-M12 companion high-voltage analogue front end integrates a charge pump to control the gate of an external power switch, which lets designers choose from economical N-channel MOSFETs that have lower RDS(on) than P-channel alternatives. There is also a low-power mode that draws 0nA when no cable is attached, enabling longer battery runtime.

The protection features built into the TCPP01-M12 include adjustable 5V to 22V overvoltage protection on VBUS, short-to-VBUS protection on configuration channel pins, dead-battery management, and IEC 61000-4-2 ESD protection up to ±8kV on VBUS and CC lines.  The TCPP01-M12’s QFN12 package occupies 80% less board space than a discrete implementation.

The Nucleo-G071RB ($10.32) and X-Nucleo-USBPDM1 ($23.50) are available now from st.com or distributors.

For further information on X-Nucleo-USBPDM1, please visit www.st.com/x-nucleo-usbpdm1

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