Single capacitor multi-phase three-level buck voltage regulator

1. An apparatus comprising:

voltage regulator logic having a first phase portion and a second phase portion; and

the voltage regulator logic to include a single capacitor coupled between switches of the first phase portion and the second phase portion, wherein the voltage regulator logic is a selectable-mode Voltage Regulator (VR) to implement one or more of a plurality of VR modes, wherein the plurality of voltage regulator logic modes is to comprise at least one of: a three-level buck voltage regulator, a traditional buck voltage regulator, and a combination of the three-level buck VR and the traditional buck VR.

2. The apparatus of claim 1 , wherein each of the first phase portion and the second phase portion is to comprise a plurality of switches.

3. The apparatus of claim 1 , wherein the switches of the first phase portion is to comprise a first switch, and a second switch, wherein a first end of the single capacitor is to be coupled between the first switch and the second switch of the first phase portion.

4. The apparatus of claim 3 , wherein the switches of the second phase portion is to comprise a third switch and a fourth switch, wherein a second end of the single capacitor is to be coupled between the third switch and the fourth switch of the second phase portion.

5. The apparatus of claim 1 , wherein the voltage regulator logic is to comprise a phase shifted filter network to reduce an output ripple.

6. The apparatus of claim 5 , wherein the phase shifted filter network is to comprise: an output capacitor, a first inductor, and a second inductor, wherein the first inductor is to be coupled to a first end of the single capacitor through a first switch of the first phase portion, wherein the second inductor is to be coupled to a second end of the single capacitor through a second switch of the second phase portion.

7. The apparatus of claim 1 , wherein at least one of the switches is to receive a control input from a controller logic.

8. The apparatus of claim 7 , wherein the controller logic comprises mode selection logic to select a VR mode.

9. The apparatus of claim 1 , wherein at least one of the switches is selected from the group comprising: field effect transistors (FETs), bipolar junction transistors (BJTs), insulated gate bipolar transistors (IGBTs), and relays.

10. The apparatus of claim 1 , wherein one or more of: the logic, a processor, and memory are on a single integrated circuit.

11. A computing system comprising:

memory to store data;

a processor, coupled to the memory, to perform one or more operations on the stored data; and

a selectable-mode voltage regulator (VR) to implement one or more of a plurality of VR modes, the selectable-mode VR comprising: a plurality of switches, a first inductor and a second inductor, a single fly capacitor, an output capacitor; and controller logic to manage operations of the selectable-mode VR,

wherein the single fly capacitor is to be coupled between a first phase portion and a second phase portion of the selectable-mode voltage regulator, wherein the plurality of voltage regulator logic modes is to comprise at least one of: a three-level buck voltage regulator, a traditional buck voltage regulator, and a combination of the three-level buck VR and the traditional buck VR.

12. The system of claim 11 , wherein each of the first phase portion and the second phase portion is to comprise two or more switches from the plurality of switches.

13. The system of claim 12 , wherein the two or more switches of the first phase portion is to comprise a first switch, and a second switch, wherein a first end of the single fly capacitor is to be coupled between the first switch and the second switch of the first phase portion.

14. The system of claim 13 , wherein the two or more switches of the second phase portion is to comprise a third switch and a fourth switch, wherein a second end of the single fly capacitor is to be coupled between the third switch and the fourth switch of the second phase portion.

15. The system of claim 11 , wherein the voltage regulator is to comprise a phase shifted filter network to reduce an output ripple.

16. The system of claim 15 , wherein the phase shifted filter network is to comprise: the output capacitor, the first inductor, and the second inductor, wherein the first inductor is to be coupled to a first end of the single fly capacitor through a first switch of the first phase portion, wherein the second inductor is to be coupled to a second end of the single fly capacitor through a second switch of the second phase portion.

17. The system of claim 11 , wherein at least one of the plurality of switches is to receive a control input from a controller logic.

18. The system of claim 17 , wherein the controller logic comprises mode selection logic to select a VR mode.

19. The system of claim 11 , wherein at least one of the plurality of switches is selected from the group comprising: field effect transistors (FETs), bipolar junction transistors (BJTs), insulated gate bipolar transistors (IGBTs), and relays.

20. The system of claim 11 , wherein the VR, the processor, and the memory are on a single integrated circuit.