The enable pin (EN) is active high. The output is enabled when the voltage applied to EN is greater than V_EN(HI) and disabled when the applied voltage is less than V_EN(LOW). If external control of the output voltage is not needed, connect EN to IN. This device has a smart enable circuit to reduce quiescent current. When the voltage on the enable pin is driven above V_EN(HI), the output is enabled and the smart enable internal pulldown resistor (R_EN(PULLDOWN)) is disconnected. When the enable pin is floating, the R_EN(PULLDOWN) is connected and pulls the enable pin low to disable the output. In addition to reducing quiescent current, the smart pulldown helps ensure that the logic level is correct even when EN is driven from a source that has limited current drive capability. The R_EN(PULLDOWN) value is listed in the Section 6.5 table.