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TPS552872-Q1: schemetic R and C recommendations

Part Number: TPS552872-Q1
Other Parts Discussed in Thread: TPS63020-Q1, TPS552892-Q1

Hi Expert,

My customer is using TPS552872-Q1 as a buckboost to output fixed 3.8V, without current limitation, as shown in the following circuit: Can you please help confirm below questions?
1, should we short the ISP and ISN pin together? Right?
2,Suppose the ISP and ISN are shorted:
A.What are the recommended values for R28, C17 and C18 of pin15 COMP?
B.What are the recommended values for R27 of pin16 CDC?

Thanks and best regards,