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Original question:

TPS63806: True shutdown fuction

TPS63806: Correct to assume no risk of back-feeding or harming part with 5V on output when disabled?

Southern Engineering
Intellectual 715 points

Hi,

We have a node that needs to act as both source and sink in different use cases. We are looking at using TPS63806YFFR in the sourcing case, boosting minimum 3V to 5V/2A. That part is hopefully no problem. However, we wanted to ask what to expect in the other use case, where the TPS63806YFFR is disabled and another voltage regulator generates 5V. These 5V will then appear at the output of the TPS63806YFFR, which might have 0V at its input.

We read that TPS63806YFFR has "True shutdown function with load disconnect" but find no more details.

Is it correct to assume that we do not need to worry about the described case, that there is no risk of back-feeding through or harming TPS63806YFFR when it is disabled? No need to add additional HW (such as series pFET) to disconnect it from the 5V node?

Thanks!