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TS4274 Fiches technique(PDF) 4 Page - Taiwan Semiconductor Company, Ltd

No de pièce TS4274
Description  400mA Ultra Low Dropout Fixed Voltage Regulator
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Fabricant  TSC [Taiwan Semiconductor Company, Ltd]
Site Internet  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS4274 Fiches technique(HTML) 4 Page - Taiwan Semiconductor Company, Ltd

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TS4274
400mA Ultra Low Dropout Fixed Voltage Regulator
4/10
Version: A07
Application Information (Continue)
Thermal Characteristics
A heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of the
application. Under all possible operating conditions, the junction temperature must be within the range specified under
absolute maximum ratings. To determine if the heatsink is required, the power dissipated by the regulator, PD must be
calculated.
The below formula shows the voltages and currents for calculating the PD in the regulator:
IIN = IL / IG
PD = (VIN-VOUT) * IL + (VIN) * IG
Ex. PD = (3.3V-2.5V) * 0.5A + 3.3V * 11mA
= 400mW + 36mW
= 436mW
Remark: IL is output load current,
IG is ground current.
VIN is input voltage
VOUT is output voltage
The next parameter which must be calculated is the maximum allowable temperature rise.
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, ≥80oC/W for the
TO-263 package, ≥150
oC/W for the TO-252 package, or ≥170oC /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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