lp3875et-adj National Semiconductor Corporation, lp3875et-adj Datasheet - Page 12

• Manufacturer Part Number: lp3875et-adj
• Description: 1.5a Fast Ultra Low Dropout Linear Regulators
• Manufacturer: National Semiconductor Corporation

www.national.com
Application Hints
HEATSINKING SOT223-5 PACKAGE
Figure 3 shows a curve for the θ
different copper area sizes, using a typical PCB with 1 ounce
copper and no solder mask over the copper area for heat
sinking.
FIGURE 3. θ
FIGURE 2. Maximum power dissipation vs ambient
temperature for TO-263 package
JA
vs Copper(1 Ounce) Area for SOT-223
package
(Continued)
JA
of SOT-223 package for
20074682
20074633
12
The following figures show different layout scenarios for
SOT-223 package.
FIGURE 4. SCENARIO A, θ
FIGURE 5. SCENARIO B, θ
JA
JA
= 148˚C/W
= 125˚C/W
20074684
20074683