STMicroelectronics is expanding its highly integrated and energy-efficient ST-ONE family of USB Power Delivery (USB-PD) digital controllers by introducing the ST-ONEMP, which supports two power outputs.
The ST-ONEMP builds on the industry-first ST-ONE architecture, combining an Arm Cortex-M0+ microcontroller, energy-efficient non-complementary active clamp flyback controller, and USB-PD 3.1 interface in a single package.
Using galvanic isolation between primary-side and secondary-side circuitry, the ST-ONE architecture greatly simplifies the design and assembly of USB-PD power adapters.
Now, by adding support for power sharing, the latest ST-ONEMP simplifies the implementation of a second output in addition to the USB-PD output to increase flexibility and convenience for end users.
Inside the ST-ONEMP, the Cortex-M0+ MCU is integrated on the secondary side and has 64 KB of Flash to customize the USB-PD protocol and power conversion firmware. PPS USB-PD 3.1 certified firmware is preloaded, enabling an out-of-the-box solution for standard applications. The MCU controls the synchronous rectifier and flyback converter and is optimized for zero-voltage switching non-complementary active clamp topology, which enables high power with higher efficiency than conventional quasi-resonant flyback.
ST-ONEMP is paired with ST's MasterGaN power technology, which contains ST's Gallium Nitride (GaN) broadband power transistors with integrated gate drivers. ST's GaN technology enables superior switching at higher frequencies than conventional silicon MOSFETs, enabling the adapters to deliver greater power density with high energy efficiency while meeting the latest green design codes.
ST has produced the EVLONEMP reference design leveraging ST-ONEMP and MASTERGAN4 to create a 65W + 10W AC/DC adapter with weight and bulk comparable to a 20W single-port smartphone charger. Maximum efficiency, 94%, is 2% higher than comparable conventional two-port adapters, while the PCB area is one-quarter the size.
OEMs can provide greener products that save energy and reduce the use of plastics, allowing for smaller cabinet sizes.