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LM2937ET-10 Fiches technique(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce LM2937ET-10
Description  500 mA Low Dropout Regulator
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2937ET-10 Fiches technique(HTML) 8 Page - National Semiconductor (TI)

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Application Hints (Continued)
θ
(H−A) is specified numerically by the heatsink manufacturer
in the catalog, or shown in a curve that plots temperature rise
vs power dissipation for the heatsink.
HEATSINKING TO-263 AND SOT-223 PACKAGE PARTS
Both the TO-263 (“S”) and SOT-223 (“MP”) packages use a
copper plane on the PCB and the PCB itself as a heatsink.
To optimize the heat sinking ability of the plane and PCB,
solder the tab of the package to the plane.
Figure 3 shows for the TO-263 the measured values of
θ
(J−A)
for different copper area sizes using a typical PCB with 1
ounce copper
and no solder mask over the copper area used
for heatsinking.
As shown in the figure, increasing the copper area beyond 1
square inch produces very little improvement. It should also
be observed that the minimum value of
θ
(J−A) for the TO-263
package mounted to a PCB is 32˚C/W.
As a design aid,
Figure 4 shows the maximum allowable
power dissipation compared to ambient temperature for the
TO-263 device (assuming
θ
(J−A) is 35˚C/W and the maxi-
mum junction temperature is 125˚C).
Figure 5 and Figure 6 show the information for the SOT-223
package.
Figure 6 assumes a
θ
(J−A) of 74˚C/W for 1 ounce
copper and 51˚C/W for 2 ounce copper and a maximum
junction temperature of 125˚C.
SOT-223 SOLDERING RECOMMENDATIONS
It is not recommended to use hand soldering or wave solder-
ing to attach the small SOT-223 package to a printed circuit
board. The excessive temperatures involved may cause
package cracking.
Either vapor phase or infrared reflow techniques are pre-
ferred soldering attachment methods for the SOT-223 pack-
age.
DS011280-28
FIGURE 3.
θ
(J−A) vs Copper (1 ounce) Area for the
TO-263 Package
DS011280-29
FIGURE 4. Maximum Power Dissipation vs T
AMB for
the TO-263 Package
DS011280-30
FIGURE 5.
θ
(J−A) vs Copper (2 ounce) Area for the
SOT-223 Package
DS011280-31
FIGURE 6. Maximum Power Dissipation vs T
AMB for
the SOT-223 Package
www.national.com
8


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