Maxim: fault protection solution for high-apeed USB ports and industrial voltage applications

With the MAX22505 ±40V high-speed USB fault protector from Maxim Integrated Products, designers can now eliminate USB port damage from all faults, including ground potential differences, up to ±40V without the tradeoffs required by competing solutions. It protects data and power lines from industrial equipment powered at 24VAC and 40VDC, while also reducing solution size by more than 50% for industrial voltage applications.

Industrial environments continue striving to reduce solution footprint to increase productivity and throughput while demanding system robustness and increased uptime. As a result, there has been a trend to adopt USB vs. RS232 on automation equipment due to a much smaller connector size. As industrial environments adopt USB to provide faster communication for applications such as real-time diagnostics, programming/service ports on programmable logic controllers, or supporting camera vision systems, USB ports require fault protection from overvoltage and ground differences while balancing the need to support high-speed data rates up to 480Mbps. Damage to both the host and device side can occur in these systems, requiring a unique solution that achieves high levels of fault protection. Existing USB fault protection solutions on the market today compromise either USB operating speed or voltage/current limit protection on a device’s data and power lines. Consequently, current solutions on the market are costlier and incapable of providing fault protection at high-speed USB performance.

The MAX22505 answers this market need as the industry’s only solution that combines high-speed USB fault protection (480Mbps) for industrial voltages, while being flexible enough to support either host or device applications including USB On-The-Go. It protects equipment from overvoltage or negative voltage on power and data lines, as well as ground potential differences between devices. It reduces solution size by more than 50% compared to competing solutions and ensures robust communications in harsh environments cost-effectively in a simpler design. Housed in a 24-pin 4 x 4mm TQFN package, it operates over the -40 to +105°C temperature range. Applications include building automation, industrial PCs, PLCs, and diagnostic USB ports. 


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