A regulated mirror current source circuit has an output transistor, a regulator for controlling the output circuit, and a current mirror having two or more current paths. The first path of the mirror is coupled in series with a current path of the output circuit, and the second path is coupled to the regulator, to provide feedback. The feedback can provide better precision, or reduced component area. The circuit can include cascode transistors, and the regulator can have integral control. The output transistor gate-source voltage is overdriven to reduce "on" resistance of the output transistor. When the output transistor is a high voltage transistor, its area can be reduced without sacrificing compliance.