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LT1584/LT1585/LT1587

158457a

APPLICATIO S

FEATURES

TYPICAL APPLICATIO

DESCRIPTIO

7A, 4.6A, 3A Low Dropout

Fast Response

Positive Regulators

Adjustable and Fixed

NOTE: MICROPROCESSOR APPLICATIONS WITH LOAD TRANSIENTS OF 3.8A REQUIRE

OUTPUT DECOUPLING CAPACITANCE > 1300

µF ON FIXED VOLTAGE PARTS TO ACHIEVE

< 50mV OF DEVIATION FROM NOMINAL OUTPUT. CONSULT FACTORY FOR DETAILS

The LT

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.

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Fast Transient Response

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Guaranteed Dropout Voltage at Multiple Currents

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Load Regulation: 0.05% Typical

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Trimmed Current Limit

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On-Chip Thermal Limiting

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Standard 3-Pin Power Package

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Pentium

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PowerPC

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Other 2.5V to 3.6V Microprocessor Supplies

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Low Voltage Logic Supplies

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Battery-Powered Circuitry

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Post Regulator for Switching Supply

LT1585/7CM, LT1584/5/7CT

Adjustable

LT1585/7CM-3.3, LT1584/5/7CT-3.3

3.3V Fixed

LT1585CM-3.38, LT1584/5CT-3.38

3.38V Fixed

LT1585/7CM-3.45, LT1584/5/7CT-3.45

3.45V Fixed

LT1585/7CM-3.6, LT1584/5/7CT-3.6

3.6V Fixed

, LTC and LT are registered trademarks of Linear Technology Corporation.

Pentium is a trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation.

3.3V, 7A, 4.6A, 3A Regulator

LT1584-3.3

LT1585-3.3

LT1587-3.3

1585 TA01

C1

10

µF

* REQUIRED FOR STABILITY

LT1584: C2 = 22

µF,

LT1585/LT1587: C2 = 10

µF

3.3V

7A, 4.6A, 3A

C2*

SOLID

TANTALUM

+

+

OUTPUT CURRENT (A)

0

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

0.5

1585 TA02

Dropout Voltage vs Output Current