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LTC4020 MOSFET heat issue

Question asked by Markze on Jun 4, 2018
Latest reply on Jun 8, 2018 by WATaylor



We find LTC4020 heat issue low-side MOSFET during boost mode. Vin~17V and Vout=20.5V @ 8A.


We already try to add snubber, changing better Rds (on) MOSFET and reduce switching frequency, but it does not have much improvement.


LTC4020 is damaged as well during the evaluation.


Could you advise what is the other possible cause of the Low-side MOSFET heat issue.


I suspect it is the layout issue, as Mosfet is the top layer and Inductor is the bottom. Maybe its Vias will create parasitic capacitance.


Thank you.