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TMDSCNCD263P: Power tree question

Part Number: TMDSCNCD263P

Tool/software:

Hi,

My customer has a question for power tree. Below is Figure 2-6 in users guide (spruj86c.pdf).
VSYS_1V2 is generated from BB_OUT(6V) using buck converter.



Is there specific reason why PMIC does not generate 1.2V directly?

Thanks and regards,
Koichiro Tashiro