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參數(shù)資料
| 型號(hào)： | LT1084CT-12 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 3A, 5A, 7.5A Low Dropout Positive Fixed Regulators |
| 中文描述： | 12 V FIXED POSITIVE LDO REGULATOR, 1.5 V DROPOUT, PSFM3 |
| 封裝： | PLASTIC, TO-220, 3 PIN |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 287K |
| 代理商： | LT1084CT-12 |
9
LT1083/84/85 Fixed
thermal resistance specifications have been developed to
more accurately reflect device temperature and ensure
safe operating temperatures. The data section for these
new regulators provides a separate thermal resistance and
maximum junction temperature for both the Control Sec-
tionand the Power Section Previous regulators, with a
single junction-to-case thermal resistance specification,
used an average of the two values provided here and
therefore could allow excessive junction temperatures
under certain conditions of ambient temperature and heat
sink resistance. To avoid this possibility, calculations
should be made for both sections to ensure that both
thermal limits are met.
Junction-to-case thermal resistance is specified from the
IC junction to the bottom of the case directly below the die.
This is the lowest resistance path for heat flow. Proper
mounting is required to ensure the best possible thermal
flow from this area of the package to the heat sink. Thermal
compound at the case-to-heat sink interface is strongly
recommended. If the case of the device must be electroni-
cally isolated, a thermally conductive spacer can be used
as long as its added contribution to thermal resistance is
considered. Note that the case of all devices in this series
is electronically connected to the ouput.
For example, using a LT1083-5CK (TO-3, Commercial)
and assuming:
V
IN
(max continuous) = 9V, V
OUT
= 5V, I
OUT
= 6A,
T
A
= 75
°
C
θ
HEAT SINK
= 1
°
C/W,
θ
CASE-TO-HEAT SINK
= 0.2
°
C/W for K package with
thermal compound.
Power dissipation under these conditions is equal to:
P
D
= (V
IN
– V
OUT
) (I
OUT
) = 24W
Junction temperature will be equal to:
T
J
= T
A
+
P
D
(
θ
HEAT SINK
+ θ
CASE-TO-HEAT SINK
+
θ
JC
)
For the Control Section:
T
J
= 75
°
C
+
24W (1
°
C/W
+
0.2
°
C/W
+
0.6
°
C/W) =
118
°
C
118
°
C < 125
°
C = T
JMAX
(Control Section Commer-
cial Range)
For the Power Transistor:
T
J
= 75
°
C
+
24W (1
°
C/W
+
0.2
°
C/W
+
1.6
°
C/W) =
142
°
C
142
°
C < 150
°
C = T
JMAX
(Power Transistor Commer-
cial Range)
In both cases the junction temperature is below the
maximum rating for the respective sections, ensuring
reliable operation.
APPLICATIO
S I
FOR
ATIO
U
W
U
U
High Efficiency Regulator
+
–
+
28V
INPUT
28V
470
28V
4N28
1N914
1N914
LT1011
10k
10k
10k
1k
1M
MR1122
1mH
10,000μF
OUTPUT
LT1083-5 OUT
IN
GND
LT1083/4/5 TA03
TYPICAL APPLICATIO
N
S
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1084CT-3.3 | 3A, 5A, 7.5A Low Dropout Positive Fixed Regulators |
| LT1084MK-12 | 3A, 5A, 7.5A Low Dropout Positive Fixed Regulators |
| LT1084MK-5 | 3A, 5A, 7.5A Low Dropout Positive Fixed Regulators |
| LT1085CK-12 | 3A, 5A, 7.5A Low Dropout Positive Fixed Regulators |
| LT1085CK-5 | 3A, 5A, 7.5A Low Dropout Positive Fixed Regulators |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1084CT-12#PBF | 功能描述:IC REG LDO 12V 5A TO-220-3 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:8V 輸入電壓:10.5 V ~ 23 V 電壓 - 壓降（標(biāo)準(zhǔn)）:1.7V @ 40mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:100mA（最小值） 電流 - 限制（最?。?- 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOIC 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:1075 (CN2011-ZH PDF) 其它名稱:296-24390-1 |
| LT1084CT-3.3 | 功能描述:IC REG LDO 3.3V 5A TO-220-3 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:3V 輸入電壓:2.3 V ~ 5.5 V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.035V @ 150mA 穩(wěn)壓器數(shù)量:2 電流 - 輸出:150mA 電流 - 限制（最小）:300mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 裸露焊盤，6-TMLF? 供應(yīng)商設(shè)備封裝:6-TMLF?（1.6x1.6） 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1104 (CN2011-ZH PDF) 其它名稱:576-3018-6 |
| LT1084CT-3.3#PBF | 功能描述:IC REG LDO 3.3V 5A TO-220-3 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:8V 輸入電壓:10.5 V ~ 23 V 電壓 - 壓降（標(biāo)準(zhǔn)）:1.7V @ 40mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:100mA（最小值） 電流 - 限制（最?。?- 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOIC 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:1075 (CN2011-ZH PDF) 其它名稱:296-24390-1 |
| LT1084CT33 | 制造商:LT 功能描述:* |
| LT1084CT5 | 制造商:Linear Technology 功能描述:IC V REG LDO +5.0V 1084 TO-220-3 |
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