Hello,
I'm trying to get my head around the different configurations of the NPM1300 in order to power the NRF54H20 and some peripherals. I'm trying to avoid using external LDO's.
What I know:
NRF54H20 datasheet's reference schematic states the following voltages are required: 0.8V, 1.0V, 1.8V, and 3.3V
I have six peripherals requiring a max total of 200mA. Three require 3.3V (150mA) and three will work with 1.8V (50mA).
The NPM1300s LDOs can supply up to 50mA if its output voltage is above 1.2V, 10mA if the output voltage is below 1.2V. Minimum output voltage is 1.0V so I can't get 0.8V from these.
The NPM1300s Buck regulators can each supply up to 200mA.
I clearly need one buck regulator for 3 of the peripherals (150mA at 3.3V)
I more than likely need the other buck regulator to be 1.8V
Neither buck regulator can supply the 0.8V and neither can the LDOs so it seems I can't use this part to generate it???
My current questions are:
1. For the NRF54H20, what current consumptions should I plan for on the voltage rails listed above?
2. Can I use VDD_EXT or DCCH to get that 0.8V if the NPM1300 can't supply it?
3. Is there a better PMIC for this NRF54?
Thanks in advance for any tips. I've attached an image of my current schematic, not completed.
