alexmg2:
I am asking because I had some issued with it being simply connected to Arduino's digital pin, when arduino was outputting HIGH regulator was enabled, but then I set Arduino's pin LOW regulator did not shut down until I added pulldown resistor. But now I am not quite sure that this is how it supposed to be done properly.Thanks.
Does setting the pin HIGH with that circuit start the regulator back up? if you blink the pin, does it turn on and off like it should?
Either you have something miswired, or you didn't set the pinMode to OUTPUT. Without a sketch or schematic there's no way to know.