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參數(shù)資料
| 型號： | LT1965ITTRPBF |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 1.1A, Low Noise, Low Dropout Linear Regulator |
| 中文描述： | 1.1A的，低噪聲，低壓差線性穩(wěn)壓器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 213K |
| 代理商： | LT1965ITTRPBF |
LT1965
11
1965f
APPLICATIONS INFORMATION
The following tables list thermal resistance for several
different board sizes and copper areas. All measurements
were taken in still air on 1/16" FR-4 board with one ounce
copper.
Table 1. Measured Thermal Resistance for DFN Package
Copper Area
Topside*
Backside
Board Area
2500mm
2
2500mm
2
2500mm
2
1000mm
2
2500mm
2
2500mm
2
225mm
2
2500mm
2
2500mm
2
100mm
2
2500mm
2
2500mm
2
50mm
2
2500mm
2
2500mm
2
*Device is mounted on topside
Thermal Resistance
(Junction-to-Ambient)
60°C/W
62°C/W
65°C/W
68°C/W
70°C/W
Table 2. Measured Thermal Resistance for MSOP Package
Copper Area
Topside*
Backside
2500mm
2
2500mm
2
1000mm
2
2500mm
2
225mm
2
2500mm
2
100mm
2
2500mm
2
50mm
2
2500mm
2
*Device is mounted on topside
Thermal Resistance
(Junction-to-Ambient)
55°C/W
57°C/W
60°C/W
65°C/W
68°C/W
Board Area
2500mm
2
2500mm
2
2500mm
2
2500mm
2
2500mm
2
Table 3. Measured Thermal Resistance for DD-PAK Package
Copper Area
Topside*
Backside
2500mm
2
2500mm
2
1000mm
2
2500mm
2
125mm
2
2500mm
2
*Device is mounted on topside
Thermal Resistance
(Junction-to-Ambient)
25°C/W
30°C/W
35°C/W
Board Area
2500mm
2
2500mm
2
2500mm
2
Measured Thermal Resistance for TO-220 Package
Thermal Resistance (Junction-to-Case) = 3°C/W
Calculating Junction Temperature
Example: Given an output voltage of 2.5V, an input voltage
range of 3.3V ± 5%, an output current range of 0mA to
500mA and a maximum ambient temperature of 85°C,
what will the maximum junction temperature be
The power dissipated by the device equals:
I
OUT(MAX)
(V
IN(MAX)
– V
OUT
) + I
GND
V
IN(MAX)
where:
I
OUT(MAX)
= 500mA
V
IN(MAX)
= 3.465V
I
GND
at (I
OUT
= 500mA, V
IN
= 3.465V) = 8.2mA
So,
P = 500mA(3.465V – 2.5V) + 8.2mA(3.465V) = 0.511W
Using a DFN package, the thermal resistance will be in
the range of 60°C/W to 70°C/W depending on the cop-
per area. So the junction temperature rise above ambient
approximately equals:
0.511W 65°C/W = 33.22°C
The maximum junction temperature equals the maximum
ambient temperature plus the maximum junction tempera-
ture rise above ambient or:
T
JMAX
= 85°C + 33.22°C = 118.22°C
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