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TPS552892-Q1: Question about the mode change between BUCK and BOOST

Part Number: TPS552892-Q1

Tool/software:

Hi Expert,

Have a good day. 

I have one question about the mode change between BUCK and BOOST.

In DS: When the input voltage is close to the output voltage, the TPS552892-Q1 operates in one-cycle buck and one-cycle boost mode alternately.

Could you help to specific the boundary of “close”? How much difference between between Vin and Vout will trigger this mode?

Thanks.

Best Wishes,

Leo Ma