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LM27341 Datasheet(PDF) 22 Page - Texas Instruments

Part # LM27341
Description  LM27341/LM27342/LM27341-Q1/LM27342-Q1 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization
PDF  44 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM27341 Datasheet(HTML) 22 Page - Texas Instruments

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RTJC =
TJ - TC
Power
LM27341, LM27342, LM27341-Q1, LM27342-Q1
SNVS497E – NOVEMBER 2008 – REVISED APRIL 2013
www.ti.com
RθJA values for the MSOP-PowerPad @ 1Watt dissipation:
Number of Board
Size of Bottom Layer Copper
Size of Top Layer Copper
Number of 10 mil
RθJA
Layers
Connected to DAP
Connected to Dap
Thermal Vias
2
0.25 in2
0.05 in2
8
80.6 °C/W
2
0.5625 in2
0.05 in2
8
70.9 °C/W
2
1 in2
0.05 in2
8
62.1 °C/W
2
1.3225 in2
0.05 in2
8
54.6 °C/W
4 (Eval Board)
3.25 in2
2.25 in2
14
35.3 °C/W
RθJA values for the SON @ 1Watt dissipation:
Number of Board
Size of Bottom Layer Copper
Size of Top Layer Copper
Number of 8 mil
RθJA
Layers
Connected to DAP
Connected to Dap
Thermal Vias
2
0.25 in2
0.05 in2
8
78 °C/W
2
0.5625 in2
0.05 in2
8
65.6 °C/W
2
1 in2
0.05 in2
8
58.6 °C/W
2
1.3225 in2
0.05 in2
8
50 °C/W
4 (Eval Board)
3.25 in2
2.25 in2
15
30.7 °C/W
Figure 38. Estimate of Thermal Resistance vs. Ground Copper Area
Eight Thermal Vias and Natural Convection
Method 2:
The second method requires the user to know the thermal impedance of the silicon junction to case. (RθJC) is
approximately 9.5°C/W for the MSOP-PowerPad package or 9.1°C/W for the SON. The case temperature should
be measured on the bottom of the PCB at a thermal via directly under the DAP of the LM27341/LM27342. The
solder resist should be removed from this area for temperature testing. The reading will be more accurate if it is
taken midway between pins 2 and 9, where the NMOS switch is located. Knowing the internal dissipation from
the efficiency calculation given previously, and the case temperature (TC) we have:
(50)
Therefore:
TJ = (RθJC x PLOSS) + TC
(51)
22
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Copyright © 2008–2013, Texas Instruments Incorporated
Product Folder Links: LM27341 LM27342 LM27341-Q1 LM27342-Q1



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