LP38858_15 Datasheet, PDF (13/21 Pages) Texas Instruments – 1.5A Fast-Response High-Accuracy LDO Linear Regulator with Soft-Start

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LP38858
SNVS462D – OCTOBER 2006 – REVISED APRIL 2013
Figure 28. θ_JA vs Copper (1 Ounce) Area for the DDPAK/TO-263 package
Figure 28 shows that increasing the copper area beyond 1 square inch produces very little improvement. The
minimum value for θ_JA for the DDPAK/TO-263 package mounted to a PCB is 32°C/W.
Figure 29 shows the maximum allowable power dissipation for DDPAK/TO-263 packages for different ambient
temperatures, assuming θ_JA is 35°C/W and the maximum junction temperature is 125°C.
Figure 29. Maximum Power Dissipation vs Ambient Temperature for the DDPAK/TO-263 Package
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