ST-ONE Architecture, Increased User Flexibility and Convenience
USB-PD 3.1 PPS Certified Firmware Pre-loaded

STMicroelectronics (hereinafter ST) has released a digital controller that supports the easy design of high-efficiency 2-port USB-PD adapters.

ST announced on the 2nd that it has expanded its ST-ONE family of highly integrated, power-saving USB-PD (Power Delivery) digital controllers by releasing the ST-ONEMP, which supports two power outputs.

ST-ONEMP is implemented based on the ST-ONE architecture, which integrates the industry's first Arm® Cortex®-M0+ microcontroller, an energy-efficient non-complementary active clamp flyback controller, and a USB-PD 3.1 interface into a single package.

The ST-ONE architecture uses galvanic isolation between the primary and secondary circuits, which greatly simplifies the design and assembly of USB-PD power adapters.

The latest ST-ONEMP enhances flexibility and convenience for end users by additionally supporting power sharing, thereby enabling simple implementation of auxiliary output in addition to USB-PD output.

ST-ONEMP has a Cortex-M0+ MCU built into the secondary side and 64KB of flash memory to allow the user to adjust the USB-PD protocol and power conversion firmware.

USB-PD 3.1 PPS certified firmware is pre-loaded, making it usable as a turnkey solution that supports standard applications.

The MCU controlling the synchronous rectifier and flyback converter is optimized for the Zero-Voltage Switching (ZVS) non-compensated active clamp topology and provides high power with higher efficiency than conventional quasi-resonant flybacks.

ST-ONEMP can be used with ST's MasterGaN power technology, including ST's GaN (Gallium Nitride) wide bandgap power transistors with integrated gate drivers.

ST's GaN technology provides superior switching performance at higher frequencies than conventional silicon MOSFETs, enabling adapters with excellent power density and high energy efficiency that comply with the latest eco-friendly design regulations.

ST created the EVLONEMP reference design using ST-ONEMP and MASTERGAN4 and implemented a 65W + 10W AC/DC adapter with the weight and volume comparable to a 20W single-port smartphone charger.

The maximum efficiency is 94%, which is 2% higher than existing 2-port adapters of the same class, while the PCB area is only one-quarter.

This enables OEMs to provide more eco-friendly products that save energy and reduce plastic usage with smaller enclosure sizes.