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參數(shù)資料
| 型號： | LP3964EMPX-ADJ |
| 英文描述： | Positive Adjustable Voltage Regulator |
| 中文描述： | 積極可調(diào)電壓穩(wěn)壓器 |
| 文件頁數(shù)： | 16/22頁 |
| 文件大小： | 479K |
| 代理商： | LP3964EMPX-ADJ |
Application Hints
(Continued)
Heatsinking TO-263 and SOT-223 Packages
The TO-263 and SOT223 packages use the copper plane on
the PCB as a heatsink. The tab of these packages are
soldered to the copper plane for heat sinking. Figure 3
shows a curve for the
θ
of TO-263 package for different
copper area sizes, using a typical PCB with 1 ounce copper
and no solder mask over the copper area for heat sinking.
As shown in the figure, increasing the copper area beyond 1
square inch produces very little improvement. The minimum
value for
θ
JA
for the TO-263 packag mounted to a PCB is
32C/W.
Figure 4 shows the maximum allowable power dissipation
for TO-263 packages for different ambient temperatures,
assuming
θ
is 35C/W and the maximum junction tempera-
ture is 125C.
Figure 5 shows a curve for the
θ
of SOT-223 package for
different copper area sizes, using a typical PCB with 1 ounce
copper and no solder mask over the copper area for heat
sinking.
The following figures show different layout scenarios for
SOT-223 package.
10112932
FIGURE 3.
θ
JA
vs Copper(1 Ounce) Area for TO-263
package
10112933
FIGURE 4. Maximum power dissipation vs ambient
temperature for TO-263 package
10112919
FIGURE 5.
θ
JA
vs Copper(1 Ounce) Area for SOT-223
package
10112920
FIGURE 6. SCENARIO A,
θ
JA
= 148C/W
10112921
FIGURE 7. SCENARIO B,
θ
JA
= 125C/W
L
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP3964EMPX-ADJ/EMSN | 制造商:Texas Instruments 功能描述: |
| LP3964EMPX-ADJ/HAPB | 制造商:Texas Instruments 功能描述: |
| LP3964EMPX-ADJ/NOPB | 功能描述:低壓差穩(wěn)壓器 - LDO 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 |
| LP3964ES-1.8 | 功能描述:低壓差穩(wěn)壓器 - LDO 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 |
| LP3964ES-1.8 | 制造商:Texas Instruments 功能描述:V REG ULTRA-LDO +1.8V SMD 3964 |
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