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LM5116: is it ok to apply voltage on Vout if device is unpowered (e.g. for battery backup)?

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Part Number: LM5116

we are doing a design with 48 volt input, 9 volt output,  and would like to have a diode-mixed battery 9-volt battery backup.  Can the chip handle the Vout node being powered if the chip itself is un-powered?

Thanks!

-Michael


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