ADUM5230 Undervoltage Lockouts

The ADUM5230 has several undervoltage lockouts. One of these requires VDDB to be at around 12-18v for the lockout to be disabled. I only require the high side of the driver, and so do not need to use VDDB/VOB/GNDB. Does the rest of the chip function normally - except the low side output VOB, if VDDB is left floating or tied to ground? If not, I would presumably need to provide a 12-18v supply to it? The ADUM5230 would be used in a situation where its output is only switched relatively rarely, perhaps several times a day.

Thanks for any help

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