TPS75801 Datasheet, PDF (16/24 Pages) Texas Instruments – FAST-TRANSIENT RESPONSE 3-A LOW-DROPOUT VOLTAGE REGULATORS

TPS75801, TPS75815
TPS75818, TPS75825
TPS75833
SLVS330D – JUNE 2001 – REVISED MARCH 2004
THERMAL INFORMATION (continued)
40
35
150 LFM
30
250 LFM
25
No Air Flow
20
15
0
0.01
0.1
1
10
100
Copper Heatsink Area − cm²
Figure 25. Thermal Resistance vs Copper Heatsink Area
2 oz. Copper Solder Pad
With 25 Thermal Vias
1 oz. Copper
Power Plane
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1 oz. Copper
Ground Plane
Figure 26.
Thermal Vias, 0.3 mm
Diameter, 1.5 mm Pitch
From the data in Figure 25 and rearranging Equation 4, the maximum power dissipation for a different ground
plane area and a specific ambient temperature can be computed (see Figure 27).
16