A regulator circuit includes a first transistor coupled to a supply
voltage and a second transistor coupled between the first transistor and
an output node. The regulator circuit also includes a dynamic bias
circuit that may selectively provide a bias voltage to a gate of the
second transistor. During a first mode such as a low power mode, for
example, the bias circuit may provide the bias voltage at a fixed
percentage of the supply voltage as the supply voltage varies. In
addition, during a second mode such as a high power mode, for example,
the bias circuit may provide the bias voltage at a fixed offset from the
supply voltage as the supply voltage varies.