Analysis of USB Type-C solutions that make ultra-high-speed transmission and fast charging standard for mobile devices

Early smartphone interfaces used Micro USB and Mini USB to solve data transmission and charging functions. The former can solve the problems of short interface life and large size, and is also compatible with the USB1.1/2.0 standard and OTG function at the time, so it has been used to this day. As mobile phone manufacturers have increasingly stringent requirements for the body, the body is getting thinner and thinner, and the transmission speed and charging speed requirements are getting higher and higher, it seems that Micro USB is no longer the only solution.

Therefore, we have seen the emergence of a new interface in the mobile phone industry in the past two years - USB Type-C, which has the strong compatibility of Micro USB and realizes the unification of data transmission and power supply. It has low power consumption, small footprint, faster transmission and charging speeds, and strong scalability to bring you a *** experience.

As the leader in the semiconductor industry, ON Semiconductor's products have always attracted much attention from domestic hardware manufacturers. Recently, Mr. Li Wenhui, senior field application engineering manager of mobile market at ON Semiconductor, interpreted the latest USB standards and market trends, and shared a complete solution for USB Type-C on mobile devices.

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Wenhui Li, Senior Field Application Engineering Manager for Mobile Market at ON Semiconductor

As mobile devices are used more and more frequently, and there are no breakthroughs in battery technology, people have higher and higher requirements for charging speeds. Therefore, with the development of technology, USB Type-C and Quick Charge (QC) have become the standards for fast charging of mobile devices.

Of course, not all Type-C interfaces support the true fast charging standard. For Type-C interfaces that only support the USB 2.0 standard, fast charging cannot be achieved. ON Semiconductor's USB Type-C solution not only supports the standard USB 3.1 interface, but also supports the USB-PD protocol and a power controller that regulates the voltage according to the power requirements of the device.

According to reports, ON Semiconductor can implement multiple fast charging protocols, including USB-PD/QC2.0/QC3.0, through this NCP81239 USB-PD synchronous buck-boost controller. It has a four-switch single-inductor buck-boost function, adapts to a wide input and output voltage range, and is designed through the I2C bus, making it safe and reliable to adjust the output voltage. The internal feedback reference voltage is set through the built-in 9-bit DAC, and the output voltage range can be set through external feedback. The output voltage or output voltage compensation can be conveniently set using the I2C interface.

ON Semiconductor's NCP81239 has unique features and perfect protection functions, making it very suitable for high-reliability applications that require wide voltage input and adjustable voltage output. It solves the problem of inconvenient or unreliable voltage regulation in traditional H-bridge buck-boost, and supports an input and output voltage range of 4.5-28V. The dynamically programmable operating frequency ranges from 150kHz to 1.2MHz, which facilitates the design of different applications.

USB PD/Charging/Super Speed/Audio Solutions

ON Semiconductor provides a full range of flexible USB Type-C solutions that not only support high-current charging, but also support 10Ghz ultra-high-speed data channels, and achieve the industry's lowest power consumption and a footprint that is 95% smaller than MCU solutions on the market. Li Wenhui said that in terms of data transmission, the transmission rate under USB3.0 and Type-C environments can reach 5Gbps or 10Gbps, which requires a single-channel redriver to reduce inter-code crosstalk and reduce unwanted signal distortion that affects transmission, in order to meet the USB 3.x eye diagram height and total jitter specifications.

Compared with other similar competing devices on the market, ON Semiconductor's single device can simultaneously support USB3.1 Gen 1 (5Gbps) and Gen 2 (10Gbps) data rates, with a 20% increase in eye height and a 20% reduction in jitter.

Comparison of Competitive Single-Channel Redrivers

From the above figure, we can see that other competing device solutions only support 5Gbps, and are inferior to ON Semiconductor in terms of eye height and jitter. On the active cable, ON Semiconductor can also ensure the signal strength and performance by adding a redriver.

This is actually thanks to the FUSB340: 10Gbps USB3.1 SuperSpeed ​​Switch, which is used in USB SuperSpeed ​​Gen1 with 5Gbps data and Gen2 with 10 Gbps data and Type-C applications where reversible cables require switches. In addition to providing excellent performance for various high-speed data transmission protocols, it also has eight major features:

• USB 3.1 (Gen 2) – 10Gbps
• 10GHz bandwidth
• VDD: 1.5V – 5.0V
• 2KV HBM ESD protection
• -1dB insertion loss (at 2.5GHz)
• Low active power consumption < 12uA
• Low shutdown power consumption < 1uA
• 18-pin TMLP, 0.4 mm pitch

(2.0mm x 2.8mm x 0.4mm)

The FUSB340 super-speed switch not only complies with the USB 3.1 standard, but is also at least 40% smaller than competing solutions. It is not only suitable for mobile phones, but can also be used in the reversible Type-C USB 3.1 connectors required by tablets and laptops. ***, Li Wenhui also revealed that ON Semiconductor is currently developing USB 3.1 type C connector protection technology, which can be used to protect super-speed lines through two ON Semiconductor ESD8704 devices. Let us wait and see.