Hi,
I'm planning on using TPS82130 part for my step-down power conversion needs and there is a strong possibility that the output of the device might see an external voltage applied to it when the output power rail is driven by another source. It might happen for variety of reasons including intentionally utilizing a back-up power source.
The TPS82130 device under these conditions will be disabled by pulling EN pin down to GND so that the one and only one power source connected to the Vout rail is active at any given time. Additionally, it will also still have its input supplied by the appropriate voltage source, most likely +5Vdc, so there is no concern about reverse current flow from the device's output pit to its input through the internal switching MOSFET's body diode. However, all internal circuits related to the output pin will face that externally applied voltage. This external voltage will be in a range from 0 to +5V with the most likely value be either +1.2Vdc or +1.8Vdc.
Q: Will TPS82130 part tolerate such a mode with external voltage applied to its output pin, while disabled through EN pin, or should I take some steps to protect the part from exposure to that condition?
Please clarify this situation for me.
Regards, Michael
