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LM46001: Will the LDO automatically switch to VIN when VOUT < 3.3V?

Part Number: LM46001

I would like to operate VOUT at 1.8V instead of 3.3V during system inactivity.

The BIAS uses the output for improved efficiency, but requires 3.3V minimum.

Will the LDO automatically switch to VIN when VOUT < 3.3V?

Or do I need to ground BIAS and loose the efficiency boost when VOUT = 3.3V?

Thank you.