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TS2937 Datasheet(PDF) 4 Page - Taiwan Semiconductor Company, Ltd

Part No. TS2937
Description  500mA Ultra Low Dropout Fixed Positive Voltage Regulator
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Maker  TSC [Taiwan Semiconductor Company, Ltd]
Homepage  http://www.taiwansemi.com
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TS2937
4-4
2003/12 rev. B
Application Information (continued)
TR(max) is calculated by the using to formula:
TR(max) = TJ(max) – TA(max)
Where: TJ(max) is the maximum allowable junction
temperature, which is 125
oC for commercial
grade parts.TA(max) is the maximum ambient
temperature which will be encountered in the
application.
Using the calculated values for TR(max) and PD, the
maximum allowable value for the junction to ambient
thermal resistance,
θja, can now be found:
θja = TR(max) / PD
IMPORTANT:
if the maximum allowable value for is
found to be ≥60
oC/W for the TO-220 package, ≥80
oC/W for the TO-263 package, ≥150 oC/W for the
TO-252 package, or ≥170
oC/W for the SOT-223
package, no heatsink is needed since the package
alone will dissipate enough heat to satisfy these
requirements. If the calculated value for
θja falls below
these limits, a heatsink is required.




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