Please let us know about SYNC/MODE pin of LM53600-Q1.About SYNC/MODE pin descripton has "Do not float" description in the datasheet P4.
They are using this IC at following condition.
LM53600 ->5V -> LDO -> 3.3V -> Micro controller
Micro controller output PWM to LM53600-Q1 SYNC/MODE pin.
So there is a term SYNC/MODE pin become FLOATING before Micro contller turns on.
Please give us your advise how to avoid FLOATING SYNC/MODE condition.