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TPS563209: TPS563209 heating

Part Number: TPS563209


we are using TPS563209 as a buck converter from 12V to 5V.

We have dual inputs for this buck- one is DC in from a PSU, other from a booster-  TPS61088RHL

When loaded by 2A the inductor gets really hot, over 80 °C and the buck also reaches high temperature.

Same phenomena with both inputs.

Another issue is the booster. when the above buck is loaded , the booster's inductor also gets very hot and the corner of the IC connected to the inductor is also hot.

attached please find schematics.

please advice.


Ehud Licht