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Hello,
Hi, Godara
Under your application, room temperature=25C.
Buck3: 3.3V@1A: For uC and controller circuitry
I measure the thermal as below, we can see the IC top case temperature is 66C under 25C room temperature. TPS65265 has good thermal performance under room temperature.
Confirm with you: What is the ambient temperature range in your application? is it -40C ~ 85C?