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LMR12007: Referenced Application Note gives lower copper area recommendations for higher power dissipation?

Jacob Wyrick
Expert 7130 points
Part Number: LMR12007

Hi team,

The application note referenced in the LMR12007 layout guidelines, SNVA054C, gives a thermal approximation equation that yields smaller copper areas for higher power dissipations. The equation in question is equation (4), shown below.

If I were to replace 1.5W of power with 2W or 3W, I get 6.264 sq. inches and 5.592 sq. inches.

Is there a reason the recommended copper area is shrinking with higher power dissipation?

Thanks,

Jacob