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TPS54526 / operation under Vin=4V

Guru 29710 points
Other Parts Discussed in Thread: TPS54526

Hi Team,

I would like to ask about TPS54526.

Is it possible to operate under Vin=4V if supply 5V for VREG5 externally?
I understood the recommended voltage of Vin is 4.5~18V but it seems possible according to the following block diagram.



May I have your comment please?

Best Regards,
Yaita / Japan disty