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ADP1614 SW pin Maximum Negative Voltage

What is the maximum negative voltage the SW pin can sustain?

Datasheet only states "21V" while all other pins have a voltage range, not a single value.  SW pin can usually sustain some negative voltage.

I have some undershoot at turn on.  Worst case is -2V .

Not good, not bad but I can't tell if it's acceptable for the part.  

Please advise.