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PDF LT1584CT-3.38 Data sheet ( Hoja de datos )
| Número de pieza | LT1584CT-3.38 | |
| Descripción | 7A/ 4.6A/ 3A Low Dropout Fast Response Positive Regulators Adjustable and Fixed | |
| Fabricantes | Linear Technology | |
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LT1584/LT1585/LT1587
7A, 4.6A, 3A Low Dropout
Fast Response
Positive Regulators
Adjustable and Fixed
FEATURES
s Fast Transient Response
s Guaranteed Dropout Voltage at Multiple Currents
s Load Regulation: 0.05% Typ
s Trimmed Current Limit
s On-Chip Thermal Limiting
s Standard 3-Pin Power Package
U
APPLICATIONS
s PentiumTM Processor Supplies
s PowerPCTM Supplies
s Other 2.5V to 3.6V Microprocessor Supplies
s Low Voltage Logic Supplies
s Battery-Powered Circuitry
s Post Regulator for Switching Supply
LT1585/7CM, LT1584/5/7CT
LT1585/7CM-3.3, LT1584/5/7CT-3.3
LT1585CM-3.38, LT1584/5CT-3.38
LT1585/7CM-3.45, LT1584/5/7CT-3.45
LT1585/7CM-3.6, LT1584/5/7CT-3.6
Adjustable
3.3V Fixed
3.38V Fixed
3.45V Fixed
3.6V Fixed
DESCRIPTION
The LT®1584/LT1585/LT1587 are low dropout three-
terminal regulators with 7A, 4.6A and 3A output current
capability, respectively. Design has been optimized for low
voltage applications where transient response and mini-
mum input voltage are critical. Similar to the LT1083/4/5
family, it has lower dropout voltage and faster transient
response. These improvements make it ideal for low volt-
age microprocessor applications requiring a regulated
2.5V to 3.6V output with an input supply below 7V.
Current limit is trimmed to ensure specified output current
and controlled short-circuit current. On-chip thermal lim-
iting provides protection against any combination of over-
load that would create excessive junction temperatures.
The LT1585/LT1587 are available in both the through-hole
and surface mount versions of the industry standard 3-pin
TO-220 power package. The LT1584 is available in the
through-hole 3-pin TO-220 power package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Pentium is a trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation.
TYPICAL APPLICATION
3.3V, 7A, 4.6A, 3A Regulator
VIN ≥ 4.75V
+ C1
10µF
LT1584-3.3
LT1585-3.3
LT1587-3.3
3.3V
7A, 4.6A, 3A
+ C2*
SOLID
TANTALUM
* REQUIRED FOR STABILITY
LT1584: C2 = 22µF,
LT1585/LT1587: C2 = 10µF
1585 TA01
NOTE: MICROPROCESSOR APPLICATIONS WITH LOAD TRANSIENTS OF 3.8A REQUIRE
OUTPUT DECOUPLING CAPACITANCE > 1300µF ON FIXED VOLTAGE PARTS TO ACHIEVE
< 50mV OF DEVIATION FROM NOMINAL OUTPUT. CONSULT FACTORY FOR DETAILS
Dropout Voltage vs Output Current
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0
OUTPUT CURRENT (A)
IFULL LOAD
1585 TA02
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LT1584/LT1585/LT1587
LT1584 Dropout Voltage
vs Output Current
1.5
1.4 GUARANTEED
TEST POINTS
1.3
1.2 T = –5°C
1.1
1.0 T = 125°C
0.9 T = 25°C
0.8
0.7
0.6
0.5
0
1 2 34 5 6
OUTPUT CURRENT (A)
7
LTC1584 • TPC01
LT1585 Dropout Voltage
vs Output Current
1.5
GUARANTEED
1.4 TEST POINTS
1.3
1.2
T = –5°C
1.1
1.0 T = 125°C
T = 25°C
0.9
0.8
0.7
0.6
0.5
0
1 2 34
OUTPUT CURRENT (A)
5
LT1585 • TPC04
LT1587 Dropout Voltage
vs Output Current
1.5
GUARANTEED
1.4 TEST POINTS
1.3
1.2 T = –5°C
1.1
1.0 T = 25°C
0.9
T = 125°C
0.8
0.7
0.6
0.5
0
0.5 1.0 1.5 2.0 2.5
OUTPUT CURRENT (A)
3.0
LT1584 • TPC07
LT1584 Short-Circuit Current
vs Input/Output Differential
10
8
6
T = 125°C
T = 25°C
T = –5°C
4
MINIMUM
2
0
01
2 34
567
INPUT/OUTPUT DIFFERENTIAL (V)
LT1584 • TPC02
LT1585 Short-Circuit Current
vs Temperature
6.0
5.5
5.0
4.5
4.0
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
LT1584 • TPC05
LT1587 Short-Circuit Current
vs Temperature
5.0
4.5
4.0
3.5
3.0
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
LT1584 • TPC05
LT1584 Load Regulation
vs Temperature
0.10
∆I = 7A
0.05
0
–0.05
–0.10
–0.15
–0.20
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
LT1584 • TPC03
LT1585 Load Regulation
vs Temperature
0.10
∆I = 4.6A
0.05
0
–0.05
–0.10
–0.15
–0.20
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
LT1584 • TPC03
LT1587 Load Regulation
vs Temperature
0.10
∆I = 3A
0.05
0
–0.05
–0.10
–0.15
–0.20
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
LT1584 • TPC09
5
5 Page 
LT1584/LT1585/LT1587
APPLICATIONS INFORMATION
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:
VIN(Max Continuous) = 5.25V (5V + 5%), VOUT = 3.3V,
IOUT = 4.6A
TA = 70°C, θHEAT SINK = 4°C/W
θCASE-TO-HEAT SINK = 1°C/W (with Thermal Compound)
Power dissipation under these conditions is equal to:
PD = (VIN – VOUT)(IOUT) = (5.25 – 3.3)(4.6) = 9W
Junction temperature will be equal to:
TJ = TA + PD(θHEAT SINK + θCASE-TO-HEAT SINK + θJC)
For the Control Section:
TJ = 70°C + 9W (4°C/W + 1°C/W + 0.7°C/W) = 121.3°C
121.3°C < 125°C = TJMAX (Control Section Commercial
range)
For the Power Transistor:
TJ = 70°C + 9W (4°C/W + 1°C/W + 3°C/W) = 142°C
142°C < 150°C = TJMAX (Power Transistor Commercial
Range)
In both cases the junction temperature is below the maxi-
mum rating for the respective sections, ensuring reliable
operation.
TYPICAL APPLICATIONS N
Recommended LT1587-3.45 Circuit for the Intel 486TM DX4TM Overdrive Microprocessor
VIN ≥ 4.75V
+ C1
10µF
10V
IN OUT
LT1587-3.45
GND
+ C2
22µF
10V
PLACE AT MICROPROCESSOR SOCKET VCC PINS
+ C3 TO C6
47µF
10V
C7 TO C15
0.1µF
3.45V
3A
C16 TO C24
0.01µF
ESR OF THE 47µF IS <0.1Ω
LT1584 • TA03
Minimum Parts Count LT1585 Adjustable Circuit
for the Intel Pentium VRE Processor
THERMALLOY
7020B-MT
4.75V TO
5.25V
C1 TO C3
220µF
IN OUT
+ LT1585CT
10V
AVX TPS
ADJ
3 EACH
C4
330nF
16V
AVX X7R 0805
R1
110Ω
0.1%
R2
197Ω
0.1%
PLACE IN MICROPROCESSOR
SOCKET CAVITY
+ C5 TO C10
100µF
10V
AVX TPS
4 EACH
3.50V
4.6A
C11 TO C20
1µF
16V
AVX Y5V 0805
24 EACH
1584/5/7 TA04
AVX CORP. (803) 448-9411
THERMALLOY INC. (214) 243-4321
DO NOT SUBSTITUTE COMPONENTS.
486 and DX4 are trademarks of Intel Corporation.
LT1585 Transient Response
for 3.8A Load Current Step*
VOUT
50mV/DIV
IOUT
2A/DIV
100µs/DIV
LT1584 • TA05
* TRANSIENT RESPONSE MEASURED WITH AN INTEL
POWER VALIDATOR. VOUT IS MEASURED AT THE
POWER VALIDATOR
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.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT1584CT-3.38.PDF ] | |
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