7.2.2 Voltage Regulator

The SAM D5x/E5x internal Main Voltage Regulator has three different modes:

  • Linear mode: This is the default mode when CPU and peripherals are running. It does not require an external inductor.
  • Switching mode. This is the most power efficient mode when the CPU and peripherals are running and which requires an external inductor between VSW and VDDCORE. This mode can be selected by software on the fly.
  • Shutdown mode. When the chip is in backup mode, the internal regulator is off, the VSW core power domain is OFF. The VDDBU backup domain is powered by the backup regulator (LPVREG).

Note that the Voltage Regulator modes are controlled by the Power Manager.