True fault protection also reduces solution size, says Maxim Integrated

Solution for High-Speed USB Ports and Industrial Voltage Applications

Designers can eliminate USB port damage from all faults, including ground potential differences, up to ±40V, says Maxim Integrated of its MAX22505 fault protector. This can be achieved without the tradeoffs required by competing solutions, says the company. MAX22505 eliminates port damage from all faults, including ground potential differences, up to ±40V and is also claimed to reduce solution size by more than 50 per cent.

The MAX22505 ±40V high-speed USB fault protector protects data and power lines from industrial equipment powered at 24V AC and 40V DC, while also reducing solution size by more than 50 per cent for industrial voltage applications.

To reduce footprint, industrial applications have adopted USB rather than RS232 on automation equipment due to its 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 (PLCs), or supporting camera vision systems, USB ports require fault protection from over-voltage and ground differences while balancing the need to support high-speed data rates up to 480Mbit per second. Damage to both the host and device side can occur in these systems, requiring high levels of fault protection. Existing USB fault protection compromises either USB operating speed or voltage/current limit protection on a device’s data and power lines. Consequently, they are costlier and incapable of providing fault protection at high-speed USB performance.

The MAX22505 is believed to be the industry’s only solution that combines high-speed USB fault protection (480Mbits per second) for industrial voltages, while being flexible enough to support either host or device applications including USB on-the-go (OTG). It protects equipment from over-voltage or negative voltage on power and data lines, as well as ground potential differences between devices.

It is housed in a 24-pin 4.0 x 4.0mm TQFN package and operates over the -40 to +105 degree C temperature range. Applications include building automation, industrial PCs, PLCs, and diagnostic USB ports.

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