Hello,
I'm working on finding the smallest possible power solution for the STM32N6.
The reference boards(STM32N6570-DK and STM32N6 Nucleo-144) uses multiple discrete buck converters and LDO to power the N6. It must be possible to do it smaller.
From I understand from the datasheet, the sequence of power-up goes like the following:
1. VDD and VDD18AON is applied
2. N6 outputs PWR_ON signal that must enable VDDcore/ internal SMPS
3. VDDcore/internal SMPS( 1.8V) powers up and the N6 is alive.
From the AN6000 and AN5967 is believe I understand that you have two chooses:
1. Use an external SMPS for the VDDcore that can support dynamic voltage(as the TPS62088YFP with a transistor on the ref. boards)
or
2. Use another external SMPS or LDO (1.8V) to feed the internal SMPS. With a small filter, it should be possible to use the same supply for VDD18Aon and the internal SMPS.
Was anyone experience with using the internal SMPS with minimal external components?
My initial trough was to find a PMIC, that would be able to support either solution 1 or solution 2, while still having an LDO for VDD and VDD18AON. One of my problems is that almost all PMIC that I find have to be programmed through I2C, and I cannot see how that is done when the processor is not started?
Is there any recommended PMIC for the N6?
Was anyone experience using a PMIC in combination with the N6?
Any advice is highly appreciated.
Thanks!
