The nPM6001 EK provides connections to a level shifter for hosts with a system voltage higher than 1.8 V. The maximum host side voltage should not be greater than 5.0 V.
The EK bus is supplied from the BUCK0 by default. For instances where the buck regulator has a different voltage level, it is necessary to supply the bus pin with 1.8 V from another source.
If the host system runs at 1.8 V, you can bypass the level shifter and have the bus directly connected to the Power Management Integrated Circuit (PMIC). You can power the host from BUCK0. To do this, cut SB1 and SB2 and connect SB3, SB4, and SB7.