The enable pin for the TPS7A84 is active high. The output of the TPS7A84 is turned on when the enable pin voltage is greater than its rising voltage threshold (1.1 V, max), and the output of the TPS7A84 is turned off when the enable pin voltage is less than its falling voltage threshold (0.5 V, min). A voltage less than 0.5 V on the enable pin disables all internal circuits. At the next turn-on this voltage ensures a normal start-up waveform with in-rush control, provided there is enough time to discharge the output capacitance.

When the enable functionality is not desired, EN must be tied to V_IN. However, when the enable functionality is desired, the enable voltage must come after V_IN is above V_UVLO1(IN) when a BIAS rail is used. See the Section 8 section for further details.