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TPS650830: TPS650830 EV Kit schematic - Logic signals/power nets question

Part Number: TPS650830

Hi,

We are using TPS650830 PMIC and learning the EV kit schematic, I don't understand following:

load switch control signals for VCCIO and V1.8U_2.5U are the same load switches output signals;

V3.3A_PCH_LSW control signal is output of V3.3S power good comperator that have to be released much more later than V3.3A_PCH power;

For the system that is not used V1.8U power plane, do I need to connect another power plane to VSB comperator input to get a right power up sequence signalling?

Can you please explain it?

 

Anna