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LMR51430: OR-ing of output voltages

Part Number: LMR51430

Hi,

can the LMR51430 handle the situation when there is no input voltage but the output voltage (at the output capacitors) stays at a certain level, say 5 volts, which are supplied from another source? Or should I decouple the output using a diode in order to prevent any unwanted currents flowing back into the LMR51430, namely into the SW pin?

Thank you,

Frank