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LT3990

Hi,

I want to know the use of PIN-PG (14). What if i keep it unused/unconnected. I am designing a Buck module for the input voltage ranging from 30V to 55V (battery) and output voltage of 3.3 V having the current requirement of max 50miliAmps. Can you please suggest me the value of Inductor and switching frequency requires to achieve the high efficiency. ThanksPDF