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參數(shù)資料
| 型號： | LT1587CT-3.6 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 7A, 4.6A, 3A Low Dropout Fast Response Positive Regulators Adjustable and Fixed |
| 中文描述： | 3.6 V FIXED POSITIVE LDO REGULATOR, 1.3 V DROPOUT, PSFM3 |
| 封裝： | PLASTIC, TO-220, 3 PIN |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 276K |
| 代理商： | LT1587CT-3.6 |
11
LT1584/LT1585/LT1587
APPLICATIO
S I
N
FOR
ATIO
U
This is the lowest resistance path for heat flow. Proper
mounting ensures the best thermal flow from this area of
the package to the heat sink. Linear Technology strongly
recommends thermal compound at the case-to-heat sink
interface. Use a thermally conductive spacer if the case of
the device must be electrically isolated and include its
contribution to the total thermal resistance. Please consult
“Mounting Considerations for Power Semiconductors”
1990 Linear Applications Handbook, Volume I Pages
RR3-1 to RR3-20. The output connects to the case of all
devices in the LT1584/LT1585/LT1587 series.
For example, using an LT1585CT-3.3 (TO-220, commer-
cial) and assuming:
V
IN
(Max Continuous) = 5.25V (5V + 5%), V
OUT
= 3.3V,
I
OUT
= 4.6A
T
A
= 70
°
C,
θ
HEAT SINK
= 4
°
C/W
θ
CASE-TO-HEAT SINK
= 1
°
C/W (with Thermal Compound)
W
U
Power dissipation under these conditions is equal to:
P
D
= (V
IN
– V
OUT
)(I
OUT
) = (5.25 – 3.3)(4.6) = 9W
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
= 70
°
C + 9W (4
°
C/W + 1
°
C/W + 0.7
°
C/W) = 121.3
°
C
121.3
°
C < 125
°
C = T
JMAX
(Control Section Commercial
range)
For the Power Transistor:
T
J
=
70
°
C
+ 9W (4
°
C/W + 1
°
C/W + 3
°
C/W) = 142
°
C
142
°
C < 150
°
C = T
JMAX
(Power Transistor Commercial
Range)
In both cases the junction temperature is below the maxi-
mum rating for the respective sections, ensuring reliable
operation.
TYPICAL APPLICATIO
S
N
U
LT1587-3.45
GND
IN
PLACE AT MICROPROCESSOR SOCKET V
CC
PINS
C1
10
μ
F
10V
OUT
V
IN
≥
4.75V
+
C2
22
μ
F
10V
+
C3 TO C6
47
μ
F
10V
ESR OF THE 47
μ
F IS <0.1
LT1584 TA03
+
C7 TO C15
0.1
μ
F
C16 TO C24
0.01
μ
F
3.45V
3A
Recommended LT1587-3.45 Circuit for the Intel 486
TM
DX4
TM
Overdrive Microprocessor
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
LT1585 Transient Response
for 3.8A Load Current Step*
LT1584 TA05
100
μ
s/DIV
V
OUT
50mV/DIV
I
OUT
2A/DIV
Minimum Parts Count LT1585 Adjustable Circuit
for the Intel Pentium VRE Processor
486 and DX4 are trademarks of Intel Corporation.
*TRANSIENT RESPONSE MEASURED WITH AN INTEL
POWER VALIDATOR. V
OUT
IS MEASURED AT THE
POWER VALIDATOR
LT1585CT
ADJ
IN
AVX CORP. (803) 448-9411
THERMALLOY INC. (214) 243-4321
DO NOT SUBSTITUTE COMPONENTS.
C1 TO C3
220
μ
F
10V
AVX TPS
3 EACH
R1
110
0.1%
C4
330nF
16V
AVX X7R 0805
OUT
4.75V TO
5.25V
THERMALLOY
7020B-MT
PLACE IN MICROPROCESSOR
SOCKET CAVITY
+
C5 TO C10
100
μ
F
10V
AVX TPS
4 EACH
+
C11 TO C20
1
μ
F
16V
AVX Y5V 0805
24 EACH
R2
197
0.1%
3.50V
4.6A
1584/5/7 TA04
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PDF描述 |
|---|---|
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| LT1585 | 4.6A, Low Dropout Fast Response Positive Regulators Adjustable and Fixed(4.6A, 低壓差，快速響應正輸出穩(wěn)壓器（固定和可調(diào)輸出電壓）) |
| LT1587 | 3A Low Dropout Fast Response Positive Regulators Adjustable and Fixed(3A，低壓差，快速響應正輸出穩(wěn)壓器（固定和可調(diào)輸出電壓）) |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT1587CTPBF | 制造商:Linear Technology 功能描述:LT1587CTPBF |
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| LT160Z | 制造商:SEOUL 制造商全稱:Seoul Semiconductor 功能描述:GREEN OVAL LAMP LED |
| LT161 | 制造商:SEOUL 制造商全稱:Seoul Semiconductor 功能描述:BLUE OVAL LAMP LED |
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