Datasheet

4-layer.0.062” FR4
Viasare0.012” diameter,plated
Top/Bottomlayersare2oz.copper
Innerlayersare1oz.copper
T
J
R
qJC
R
qCS
R
qSA
T
C
T
S
T
A
0.062in.
R
qJA
= R +R +R
q q qJC CS SA
90
80
70
60
50
40
30
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
q
JA
(°C/W)
Area(in )
2
4.0
0LFM
150LFM
250LFM
PCBCrossSection
PCBTopView
0.5in
2
1.0in
2
2.0in
2
TPS74401-EP
SBVS122B –MARCH 2010–REVISED SEPTEMBER 2010 www.ti.com
Figure 34. PCB Layout and Corresponding R
qJA
Data, Top Layer Thermal Plane
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