When a loss-of-power-supply occurs, the output shuts down, regardless of whether the IN pin is high or low. For a resistive or a capacitive load, the loss-of-power-supply has no risk. But for a charged inductive load, the current is driven from all the logic control pins to maintain the inductance current. To protect the system in this condition, TI recommends protection with an external free-wheeling diode.

Figure 7-16 Protection for Loss of Power Supply