"Leading the way among semiconductor manufacturers, ST is now able to deliver USB-IF-certified reference designs and chips to meet customers’ demands for a high-power, industry-standard universal charger/adapter," says Matteo Lo Presti, Executive Vice President Analog Sub-Group, Analog, MEMS and Sensors Group, STMicroelectronics. "By moving quickly to support USB PD EPR and achieve certification, we are accelerating the replacement of custom power plugs and DC barrels in numerous applications with a USB-C connector. This allows charging with a universal AC or DC adapter, reducing cost and environmental impact."
Certified by the USB-IF to deliver up to 140W (28V@5A), the REF_STUSB140W (sink) and the ST-ONEHP (source) represent two halves of the complete USB PD reference design for the solution. The sink reference design assures designers of an efficient, cost-effective working solution for seamless USB PD integration. The ST-ONEHP is supplied pre-loaded with certified USB PD 3.1 EPR firmware.
Together, the new USB solutions enable a larger universe of applications to adopt a USB-C connector and hence allow charging from a universal AC to DC adapter. This reduces the number of adapters the end user needs to carry and cuts e-waste, while also lowering transportation costs and CO2 emissions.
"The USB PD 3.1 specification represents a significant breakthrough to satisfy the charging demands of a wider range of applications beyond 100W," says Jeff Ravencraft, USB-IF President and COO. "As one of the first USB PD EPR reference designs to achieve USB-IF Certification, ST’s latest ICs will accelerate the industry’s transition from proprietary power connectors to USB Type-C."
An active contributor to the USB PD 3.1 specification which includes the Extended Power Range (EPR) definition, the ST solutions are among the first designs certified.
ST’s application (sink) side reference design is based on an STM32, an STUSB1602 analog front-end IC, high-voltage protection devices, and a dedicated software stack. The design supports protocol fine tuning and addresses a large range of applications.
The adapter (source) side design delivers up to 140W (28V@5A) output from an ST-ONEHP digital controller specifically designed for USB PD 3.1 EPR chargers. The controller integrates an Arm Cortex M0+ core, an offline programmable controller with synchronous rectification, and a USB PD PHY in a single package. It pairs with ST’s MasterGaN power stage to create the highest power density chargers for battery powered devices, exceeding 25W/in.3 with 140W output power and 94% peak efficiency.
As the third controller in the ST-ONE family, the ST-ONEHP has 28V output capability to simplify building chargers and power adapters rated up to 140W. Sharing the ST-ONE architecture, the converter is a non-complementary active-clamp-flyback zero-voltage-switching (ZVS) topology that ensures superior efficiency at high power output and switching frequency. Essential features including secondary regulation and the USB PD communication interface are integrated, saving bill-of-materials costs as well as PCB size and complexity. Built-in synchronous rectification helps maximize efficiency and reinforced galvanic isolation permits a solution that is both compact and safe.
Samples of the ST-ONEHP are already available in a SSOP36 leaded package, priced from $3.90 for orders of 1000 pieces. Evaluation boards of the SINK and SOURCE solutions are available on request.
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