Chip protects USB interfaces against overvoltage

December 14, 2020 // By Christoph Hammerschmidt
Chip protects USB interfaces against overvoltage
With the increasing use of smartphones and similar consumer devices in cars, the prevalence of in-car USB ports for these devices is growing. Diodes, Inc. has developed a suitable protector chip. The AEC-Q100 qualified, and PPAP capable DPO2039DABQ 4-channel protection solution for USB Type-C ports is targeted for use in applications like automotive head units, rear seat entertainment units and in-car charging. 

There has been increasing adoption of the USB Type-C interface, particularly by automotive manufacturers keen to provide future-proof ports for smart devices and other peripherals. As a result, many design engineers are now looking for simple but effective solutions to provide in-line protection for the data lines of USB Type-C ports. 

Part of Diodes’ Discrete Dataline Protection  series, the DPO2039DABQ is used in line with the CC1, CC2, and D+ and D- or SBU signals of a USB Type-C port to protect the device from electrostatic discharge (ESD), faults caused by the presence of an excessive voltage or short circuit to VBUS on any of the four data lines, or an over-temperature event. 

The device features low insertion loss, with an on-resistance of typically 300mΩ and equivalent capacitance of 50pF or less, meaning it has no negative impact on the bandwidth of the data lines. It’s high level of ESD protection also removes the need for external transient voltage suppressors. 

The chip integrates high-performance MOSFETs, gate drivers, and control logic to isolate the data lines if a fault condition is detected. The typical overvoltage fault detection response time is 100ns. Thermal shutdown is preconfigured with a threshold of +150°C and +20°C hysteresis. 

More information: DPO2039DABQ 

 


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