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For LDOs with an EN (CTL, STBY, CE) pin, is it necessary to connect a resistor in series to short the EN pin to the supply input voltage pin or ground?
There is no problem if the LDO's operating control pin is directly connected to VCC (Vin) or ground. Also, since a series resistor or constant current pull-down is built into the IC, no external resistor is necessary.Related Link:Technical Document