LT1584CT-3.3 datasheet(11/12 Pages) LINER

Part #	LT1584CT-3.3

Description	7A, 4.6A, 3A Low Dropout Fast Response Positive Regulators Adjustable and Fixed

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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11

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

LT1587-3.45

GND

IN

PLACE AT MICROPROCESSOR SOCKET VCC PINS

C1

10

µF

10V

OUT

VIN ≥ 4.75V

+

C2

22

µF

10V

+

C3 TO C6

47

µF

10V

ESR OF THE 47

µF IS <0.1Ω

LT1584 • TA03

+

C7 TO C15

0.1

µF

C16 TO C24

0.01

µF

3.45V

3A

Recommended LT1587-3.45 Circuit for the Intel 486

TM DX4TM 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

µs/DIV

VOUT

50mV/DIV

IOUT

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. VOUT 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

µF

10V

AVX TPS

3 EACH

R1

110

Ω

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

µF

10V

AVX TPS

4 EACH

+

C11 TO C20

1

µF

16V

AVX Y5V 0805

24 EACH

R2

197

Ω

0.1%

3.50V

4.6A

1584/5/7 TA04

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LT1584CT-3.3 Datasheet(PDF) 11 Page - Linear Technology

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