B6284 boost converter
Well - if you hooked it up in a circuit which resembles the Typical Application on page 1 of the datasheet, then yes you are missing something.


There's no way for the IC to prevent current from flowing from your supply thru L1 &amp; D1, to the output.
The Enable pin is only intended to switch the Boost converter IC on &amp; off, not act as an output switch.