Three dimensional switching voltage regulator

A switching voltage regulator comprising:

• a first converter connected to an input voltage and comprising a first plurality of switches operating at a first switching frequency;
• and
• a second converter connected to a ground voltage and comprising a second plurality of switches operating at a second switching frequency, wherein the second switching frequency is higher than the first switching frequency,
• wherein the first plurality of switches are formed on a first die, and the second plurality of switches are formed on a second die, and
• wherein the first die and the second die are fabricated through different processes having different figure of merit (FOM) characteristics.

A switching voltage regulator comprising:

• a substrate;
• a first die stacked on the substrate, wherein a blocking transistor and a control circuit are formed on the first die;
• and
• a second die stacked on the first die, wherein a plurality of transistors are formed on the second die,
• wherein the blocking transistor is configured to block an input voltage,
• wherein the plurality of transistors are configured to perform a switching operation under control of the control circuit, and
• wherein the blocking transistor and the plurality of transistors are configured to operate as a converting circuit of a DC-DC converter.