I am of two minds on this one:
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It is a lot of current (an extra 220mA with the 15ohm) for the little on-board regulator, but it only draws that current when plugged in after a long discharge. If you hold the processor in reset for longer during this power up my feeling is that it would like be OK. Testing would certainly be required.
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A separate regulator would be better in some ways, but not necessarily a linear regulator with the attendant heat produced, depending your power and packaging requirements.