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I hope I'm right here. I have question concerning the TPS2020:
Datasheet says that output voltage must not be higher than input voltage by more than 0.3V:
It's referring to an enabled TPS2020 with an input source, Vin, and the output connected to a source Vin + 0.3V. This is done to protect ESD structures designed to withstand transient but not excessive DC voltage. TPS2020 will survive the examples you gave because the part is diabled or has input voltage removed.
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In reply to Bob Kando:
thanks for your fast response, I appreciate it!
So, if a sudden and heavy short at the input can occur, leaving the TPS2020 still enabled for a brief period, would you say it is better to have an external protection diode from output to input to protect the internal ESD protection scheme? Would a Schottky diode be sufficient then?
In reply to kai klaas:
You could do that with schottky diodes but the internal structures should be good enough. We sell a lot of these usb switches and I don't see other instances where customers feel the extra protection is needed.
Thank you so much!
Have a great weekend!
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