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參數(shù)資料
| 型號： | LT1580CT7-2.5 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | FIXED/ADJUSTABLE POSITIVE LDO REGULATOR, 0.8 V DROPOUT, PSFM7 |
| 封裝： | PLASTIC, TO-220, 7 PIN |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 308K |
| 代理商： | LT1580CT7-2.5 |
11
LT1580/LT1580-2.5
APPLICATIO
S I
FOR
ATIO
U
low dropout applications the power dissipation will be less
than 12W.
The power in the device is made up of two main compo-
nents: the power in the output transistor and the power in
the drive circuit. The additional power in the control circuit
is negligible.
The power in the drive circuit will be equal to:
P
DRIVE
= (V
CONTROL
– V
OUT
)(I
CONTROL
)
where I
CONTROL
is equal to between I
OUT
/100 (typ) and
I
OUT
/58 (max).
I
CONTROL
is a function of output current. A curve of
I
CONTROL
vs I
OUT
can be found in the Typical Performance
Characteristics curves.
The power in the output transistor is equal to:
P
OUTPUT
= (V
POWER
– V
OUT
)(I
OUT
)
The total power is equal to:
P
TOTAL
= P
DRIVE
+ P
OUTPUT
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 the added contribution to thermal resistance is
considered. Please consult Linear Technology’s “ Mount-
ing Considerations for Power Semiconductors,” 1990
Linear Applications Handbook, Volume 1 Pages RR3-1 to
RR3-20. Note that the case of the LT1580 is electrically
connected to the output.
W
U
U
The following example illustrates how to calculate
maximum junction temperature. Using an LT1580 and
assuming:
V
CONTROL
(max continuous) = 5.25V (5V + 5%),
V
POWER
(max continuous) = 3.465V (3.3V + 5%),
V
OUT
= 2.5V, Iout = 4A,
T
A
= 70
°
C,
θ
HEATSINK
= 4
°
C/W,
θ
CASE-HEATSINK
= 1
°
C/W (with thermal compound)
Power dissipation under these conditions is equal to:
Total Power Dissipation = P
DRIVE
+ P
OUTPUT
P
DRIVE
= (V
CONTROL
– V
OUT
) (I
CONTROL
)
I
CONTROL
= I
OUT
/58 = 4A/58 = 69mA
P
DRIVE
= (5.25V – 2.5V)(69mA) = 190mW
P
OUTPUT
= (V
POWER
– V
OUT
)(I
OUT
)
= ( 3.465V – 2.5V)(4A) = 3.9W
Total Power Dissipation = 4.05W
Junction temperature will be equal to:
T
J
= T
A
+ P
TOTAL
(
θ
HEATSINK
+
θ
CASE-HEATSINK
+
θ
JC
)
For the Control section:
T
J
= 70
°
C + 4.05W(4
°
C/W + 1
°
C/W + 0.65
°
C/W) = 93
°
C
93
°
C < 125
°
C = T
JMAX
for Control Section
For the Power section:
T
J
= 70
°
C + 4.05W (4
°
C/W + 1
°
C/W + 2.7
°
C/W) = 101
°
C
101
°
C < 150
°
C = T
JMAX
for Power Section
In both cases the junction temperature is below the
maximum rating for the respective sections, ensuring
reliable operation.
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參數(shù)描述 |
|---|---|
| LT1580I | 制造商:LINER 制造商全稱:Linear Technology 功能描述:7A, Very Low Dropout Regulator |
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| LT1580IQ#TR | 功能描述:IC REGULATOR LDO ADJ 7A DDPAK-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
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