TS2940 datasheet(4/6 Pages) TSC

Part #	TS2940

Description	1A Ultra Low Dropout Fixed Positive Voltage Regulator

PDF	6 Pages

Scroll/Zoom	100%

Manufacturer	TSC [Taiwan Semiconductor Company, Ltd]

Direct Link	http://www.taiwansemi.com

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4 / 6 page

TS2940

4-6

2003/12 rev. B

Application Information (continued)

The next parameter which must be calculated is the

maximum allowable temperature rise, TR(max). this 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.

TS2940 Datasheet(PDF) 4 Page - Taiwan Semiconductor Company, Ltd