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REG104FA-2.7KTTT Datasheet(PDF) 11 Page - Texas Instruments

Part # REG104FA-2.7KTTT
Description  DMOS 1A Low-Dropout Regulator
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

REG104FA-2.7KTTT Datasheet(HTML) 11 Page - Texas Instruments

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REG104
11
SBVS025G
FIGURE 9. Maximum Power Dissipation versus Ambient
Temperature for the Various Packages and
PCB Heat Sink Configurations.
POWER DISSIPATION
The REG104 is available in two different package configura-
tions. The ability to remove heat from the die is different for
each package type and, therefore, presents different consid-
erations in the printed circuit board (PCB) layout. The PCB
area around the device that is free of other components
moves the heat from the device to the ambient air. While it
is difficult to impossible to quantify all of the variables in a
thermal design of this type, performance data for several
configurations are shown in Figure 9. In all cases the PCB
copper area is bare copper, free of solder resist mask, and
not solder plated. All examples are for 1-ounce copper. Using
heavier copper will increase the effectiveness in moving the
heat from the device. In those examples where there is
copper on both sides of the PCB, no connection has been
provided between the two sides. The addition of plated
through holes will improve the heat sink effectiveness.
Power dissipation depends on input voltage and load condi-
tions. Power dissipation is equal to the product of the aver-
age output current times the voltage across the output
element, VIN to VOUT voltage drop.
PV
V
I
DIN
OUT
OUT AVG
=•
(
)
()
Power dissipation can be minimized by using the lowest
possible input voltage necessary to assure the required
output voltage.
5
4
3
2
1
0
0
25
50
75
125
100
Ambient Temperature (
°C)
CONDITIONS
#1
#2
#3
#4
CONDITION
PACKAGE
PCB AREA
θ
JA
1
DDPAK
4in2 Top Side Only
27
°C/W
2
SOT-223
4in2 Top Side Only
53
°C/W
3
DDPAK
None
65
°C/W
4
SOT-223
0.5in2 Top Side Only
110
°C/W


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