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TLV62565 or TLV62080 - hold back strength (sink during PFM)

 Hi,

I need to know how these parts behaves on the output if set to nominal 1V8 and the load produce a short pull-up to 3V3 (about 150mA)?
Will the controller allow the voltage to rise or fight back and keep 1V8? I assume that this condition firstly cause the PFM mode to be active.

Thanks.

Br./Magnus