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參數(shù)資料
| 型號： | REG1117FA-2.5 |
| 英文描述： | 800mA and 1A Low Dropout Positive Regulator 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable |
| 中文描述： | 800mA電流和1A低壓差穩(wěn)壓積極在1.8V，2.5V，工作在2.85V，3.3V和5V和可調(diào) |
| 文件頁數(shù)： | 9/16頁 |
| 文件大小： | 264K |
| 代理商： | REG1117FA-2.5 |
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SBVS001D OCTOBER 1992 REVISED JULY 2004
www.ti.com
9
A simple experiment will determine whether the maximum
recommended junction temperature is exceeded in an
actual circuit board and mounting configuration: Increase
the ambient temperature above that expected in normal
operation until the device’s thermal shutdown is activated.
If this occurs at more than 40
°
C above the maximum
expected ambient temperature, then T
J
will be less than
125
°
C during normal operation.
The internal protection circuitry of the REG1117 was
designed to protect against overload conditions. It was not
intended to replace proper heat sinking. Continuously
running the REG1117 into thermal shutdown will degrade
reliability.
LAYOUT CONSIDERATIONS
The DDPAK (REG1117F-3.3 and REG1117FA) is a
surface-mount power package that has excellent thermal
characteristics. For best thermal performance, the
mounting tab should be soldered directly to a circuit board
copper area, as shown in Figure 3. Increasing the copper
area improves heat dissipation. Figure 4 shows typical
thermal resistance from junction-to-ambient as a function
of the copper area.
3Lead DDPAK
(1)
NOTE: (1) For improved thermal performance increase
footprint area. See Figure 4 (
Thermal Resistance vs
Circuit Board Copper Area
).
All measurements
in inches.
0
0
0
0.51
0.10
0.155
0.05
Figure 3. DDPAK Footprint
THERMAL RESISTANCE vs
CIRCUIT BOARD COPPER AREA
60
50
40
30
20
10
0
1
2
3
4
5
Copper Area (inches
2
)
REG1117F
DDPAK Surface Mount Package
1oz copper
T
J
°
C
Circuit Board Copper Area
REG1117F
DDPAK SurfaceMount Package
Figure 4. DDPAK Thermal Resistance versus Circuit Board Copper Area
相關(guān)PDF資料 |
PDF描述 |
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| REG1117FA-1.8KTTT | 800mA and 1A Low Dropout Positive Regulator 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable |
| REG1117FA-1.8 | 800mA and 1A Low Dropout Positive Regulator 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable |
| REG1117-3.3 | 800mA and 1A Low Dropout Positive Regulator 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable |
| REG1117A-1.8 | CAT5E PATCH CORD, 15FT ORANGE, MOLDED |
| REG1117A | 800mA and 1A Low Dropout Positive Regulator 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| REG1117FA-25/500G3 | 功能描述:低壓差穩(wěn)壓器 - LDO Sgl Output LDO 1.0A Fixed Int Crnt Lim RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| REG1117FA-25500G3 | 制造商:BB 制造商全稱:BB 功能描述:800mA and 1A Low Dropout Positive Regulator 1.8V, 2.5V, 2.85, 3.3V, 5V, and Adjustable |
| REG1117FA-5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| REG1117FA5.0 | 制造商:BB 制造商全稱:BB 功能描述:800mA and 1A Low Dropout Positive Regulator 1.8V, 2.5V, 2.85, 3.3V, 5V, and Adjustable |
| REG1117FA-5.0 | 制造商:Texas Instruments 功能描述: |
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