Voltage Regulators

Two embedded voltage regulators are used to provide VDDCORE to the device:

The Main voltage regulator (MAINVREG)
The Low-Power voltage regulator (LPVREG) used when the device is in Standby Sleep mode

The SAM L10/L11 Main Voltage Regulator has two modes:

Linear (LDO) mode: The default mode after reset.
Switching (BUCK) mode: The most power efficient mode when the CPU and peripherals are running (Active mode).
Note: In Active mode, the voltage regulator can be selected on the fly between LDO (low-dropout) type regulator and Buck converter using the Supply Controller (SUPC)