I find below description in datasteet.
"The TPS715xx-Q1 PMOS-pass transistor has a built-in back diode that conducts reverse current when the input voltage drops below the output voltage (for example, during power down). Current is conducted from the output to the input and is not internally limited."
Can you detail me the built-in back diode and reverse current protection? BTW, when current is conducted from the output to the input, I think other devices connected to VIN may be damaged.