Abstract: An apparatus and method for power plane control/management for a printed circuit board is provided. A single voltage regulator has an input terminal to receive a main voltage supply and has a drive terminal. First and second transistors, such as field effect transistors (FETs), have first terminals coupled to the drive terminal of the voltage regulator and second terminals coupleable to a first power plane. The first transistor has a third terminal coupleable to an auxiliary voltage supply, and the second transistor has a third terminal coupleable to a second power plane. During a first power mode, such as a full power mode, the drive terminal of the voltage regulator is coupled to turn off the first transistor and to turn on the second transistor, thereby providing regulated voltage from the main voltage supply to the first power plane and to the second power plane through the turned-on second transistor.