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Part Number: TPS2553
we've used the TPS2553DRV in at least two designs that I've tested now. Applying 5.5V to the output pin while the device is enabled doesn't cause the device to turn off or pull the FAULT# pin low. Instead I can happily feed the overvoltage back up through our power tree.
I'm testing this in circuit by using a jumper wire from EN to 3V3 and then applying a voltage of 5V5+ on the output.
In reply to Michael Tan:
yes, I fully understand the conditions for which the reverse voltage protection should be working. Which is why I opened this ticket. The input is 5V and as my ticket suggests, I can apply 5.5V and not have the protection function work. I tried with 6.5V as well just to be sure.
I don't understand your suggestion of adding an extra resistor in parallel with the input cap. Surely the protection circuit should function correctly without extra components not detailed in the data sheet?
In reply to Shareef Jalloq7:
OK, perhaps I'm not understanding the feature. I assumed that the reverse voltage protection was designed to protect any upstream regulators from this fault condition. But you're saying this feature doesn't work under normal operating conditions unless you add a loading resistor to slow the rise time on the input voltage. Shouldn't this information be detailed in the data sheet and the typical application sections be updated?
So is there an official solution to this issue? Would a TVS diode on the input be suitable rather than a resistor?
You also mentioned that this is an old part, is there an equivalent newer version that actually has reverse voltage protection that works?
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