9.2.2 Voltage Regulator

The SAM L21 internal Voltage Regulator has four 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 efficient mode when the CPU and peripherals are running. This mode can be selected by software on the fly.
  • Low Power (LP) mode. This is the default mode used when the chip is in standby mode.
  • Shutdown mode. When the chip is in backup mode, the internal regulator is off.

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