Low dropout regulator's current foldback circuit and low voltage difference linear constant voltage power supply

The application discloses low dropout regulator's current foldback circuit and low voltage difference linear constant voltage power supply, including electric current production circuit and current -limiting circuit, the electric current produces the circuit and is used for producing the electric current of following that risees along with mains voltage's rising to current output will be followed and the NMOS pipe in the current -limiting circuit will be given, the current -limiting circuit is used for exceeding at low dropout regulator's output current and is restricted to output current in the restriction electric current that reduces along with mains voltage's rising according to following the electric current when predetermineeing the threshold value. Like this, the electric current of accompanying that the electric current produced the circuit production increases along with mains voltage's increase, makes the restriction electric current of current -limiting circuit output reduce along with mains voltag