Increasing the number of dedicated copper heat spreading planes will improve the thermal performance. The scale of the improvement will depend on the scale of the PCB change, it is not something that can be estimated. The PCB Thermal Calculator shows how PCB copper content impacts the thermal performance of a device.
If the exact device is not included in the PCB Thermal Calculator, please select a similar package type to see the relative impact.
For more information on Thermal Analysis in general, please visit the following link: www.ti.com/thermal
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