An apparatus and method for wafer level fabrication of high value
inductors directly on top of semiconductor integrated circuits is
disclosed. The integrated circuit includes a plurality of regulator
circuits, each of the regulator circuits having an input node configured
to receive a plurality of pulsed input signals having a predetermined
duty cycle and a plurality of inductor windings associated with each of
the plurality of regulator circuits respectively. The integrated circuit
also includes a core array having a plurality of core elements. The
plurality of core elements are positioned adjacent to and magnetically
coupled with one or more of the plurality of inductor windings. An output
node is electrically coupled to the plurality of inductor windings. The
output signal at the output node is the sum of the instantaneous voltage
on each of the inductor windings associated with the plurality of
regulator circuits respectively. The integrated circuit also includes a
phase control circuit coupled to the plurality of regulator circuits. The
phase control circuit controls the phase of the plurality of pulsed input
signals received at the plurality of the regulator circuits to control
the output signal at the output node.