An integrated circuit for controlling an alternator circuit in an alternator regulator charging system. The integrated circuit includes a first circuit for performing core regulation functions; a second circuit having a mask selectable operation circuit that allows the integrated circuit to select an operational mode thereof, the mode being selectable from one of a stand-alone mode, a remote controlled mode wherein the first circuit is controlled by an external circuit, and a combination of the stand-alone mode and the remote controlled mode; and a third circuit having an output driver circuit for controlling a field winding of the alternator circuit.