Devices, reference voltage generators, systems and methods are disclosed, including an embodiment of a voltage regulator output transistor using a thin gate insulator to provide a low output impedance despite having a semiconductor channel width that is relatively small. The output transistor is protected from damage by a clamping circuit provided to limit the gate-to-source voltage of the transistor such that damage to the output transistor should be reduced or prevented. One such clamping circuit includes a clamp transistor that receives a reference voltage at its gate. The magnitude of the reference voltage limits to voltage to which the gate of the transistor can be driven. A voltage reference circuit provides the reference voltage so that it compensates for process and temperature variations of the output transistor.