LT1585-3.6 데이터 시트보기 (PDF) - Linear Technology

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LT1585-3.6

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

Linear Technology 

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% Typical

s Trimmed Current Limit

s On-Chip Thermal Limiting

s Standard 3-Pin Power Package

U

APPLICATIO S

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

DESCRIPTIO

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 APPLICATIO

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

158457a

1

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