The nPM6001 PMIC steps down the unregulated nPM1300 PIMIC VSYS output to 3.6 V. Only BUCK3 is
in use. BUCK1 can be disabled in hardware by connecting its output to VIN. BUCK2 can be disabled
in hardware by connecting its output to VO0. The nPM6001 PMIC Low-Dropout Regulator (LDO)s
are not in use, and they are disabled by default.
The following figure describes the circuitry of the nPM6001 PMIC.