LM2937ES-8.0/NOPB National Semiconductor, LM2937ES-8.0/NOPB Datasheet - Page 10

• Manufacturer Part Number: LM2937ES-8.0/NOPB
• Description: IC REGULATOR LDO TO-263
• Manufacturer: National Semiconductor

Specifications of LM2937ES-8.0/NOPB

• Regulator Topology: Positive Fixed
• Voltage - Output: 8V
• Voltage - Input: Up to 26V
• Voltage - Dropout (typical): 0.11V @ 50mA
• Number Of Regulators: 1
• Current - Output: 500mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: TO-263-3, D²Pak (3 leads + Tab), TO-263AA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Other names: *LM2937ES-8.0; *LM2937ES-8.0/NOPB; LM2937ES-8.0

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Application Hints
When a value for θ
a heatsink must be selected that has a value that is less than
or equal to this number.
θ
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
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
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
mum junction temperature is 125˚C).
(H−A)
FIGURE 3. θ
is specified numerically by the heatsink manufacturer
(J−A)
(H−A)
vs. Copper (1 ounce) Area for the
TO-263 Package
is found using the equation shown,
(J−A)
(Continued)
is 35˚C/W and the maxi-
(J−A)
01128028
for the TO-263
(J−A)
10
Figure 5 and Figure 6 show the information for the SOT-223
package. Figure 6 assumes a θ
copper and 51˚C/W for 2 ounce copper and a maximum
junction temperature of +85˚C.
FIGURE 4. Maximum Power Dissipation vs. T
FIGURE 5. θ
(J−A)
the TO-263 Package
SOT-223 Package
vs Copper (2 ounce) Area for the
(J−A)
of 74˚C/W for 1 ounce
01128030
01128029
AMB
for