A circuit and method for providing voltage regulation that operates with
relatively low noise, low power, fast start up and low dropout. The
invention includes a constant voltage reference that is coupled to a
reference amplifier which amplifies the reference voltage to a selectable
level. The output of the reference amplifier is provided to an integrated
low pass noise filter which suppresses at least the noise generated by
the constant voltage reference and the reference amplifier. The output of
the integrated noise filter is provided to the inverting input of an
error amplifier, whose non-inverting input is coupled to the output
voltage (VOUT). Also, the output of the error amplifier is coupled to a
gate of a pass transistor that is coupled between the input voltage (VIN)
and the output voltage (VOUT) of the invention.