Patent ID: 11880533
Assignee: APPLE INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A power management circuit comprising:
a direct-current-to-direct-current (DC-DC) converter referenced to a system ground;
a guard buffer referenced to the system ground and configured to generate a guard ground;
a supply capacitor coupled to an output of the DC-DC converter and referenced to the system ground in a first mode of operation and decoupled from the output of the DC-DC converters and referenced to the guard ground in a second mode of operation; and
a regulator coupled to the supply capacitor, wherein the regulator is coupled to the output of the DC-DC converter in the first mode of operation and decoupled from the output of the DC-DC converter during at least a portion of the second mode of operation;
wherein the DC-DC converter is configured to generate a first voltage in the first mode of operation and to generate a second voltage in the second mode of operation, wherein the second voltage is greater than the first voltage.