LP3891ES-1.5 National Semiconductor, LP3891ES-1.5 Datasheet - Page 10

• Manufacturer Part Number: LP3891ES-1.5
• Description: 0.8A Fast-Response Ultra Low Dropout Linear
• Manufacturer: National Semiconductor

Application Hints
(Continued)
As shown in the graph below, increasing the copper area
beyond 1 square inch produces very little improvement. The
minimum value for θ
for the TO-263 package mounted to a
JA
PCB is 32˚C/W.
Figure 2 shows the maximum allowable power dissipation
for TO-263 packages for different ambient temperatures,
assuming θ
is 35˚C/W and the maximum junction tempera-
JA
ture is 125˚C.
20069526
FIGURE 2. Maximum power dissipation vs ambient
temperature for TO-263 package
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