3.2.2.4 Power Management

The baseboard power management uses a MIC23451 PMIC, which is a triple synchronous buck regulator with HyperLight Load® mode featuring a power good indicator. The triple DC-DC step down power regulator delivers two outputs: 3.3V/2A and 1.8V/2A.

While the external power is being applied, the baseboard can be shut down by software and then woken up by action on the PB2 push button, which activates the WKUP signal.

The figure below shows the power management scheme.

Figure 3-6. Baseboard Power Management

One PIO (PD8) is used to check the status of the main regulator.

Table 3-3. Power Good Signal
PIO	Mnemonic	Signal Description
PD8	BB_PWR_GOOD	High level = power is established and at correct level