LT1086 데이터 시트보기 (PDF) - Linear Technology

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LT1086

1.5A Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 3.6V, 5V, 12V

Linear Technology 

LT1086 Series

1.5A Low Dropout Positive

Regulators Adjustable and

Fixed 2.85V, 3.3V, 3.6V, 5V, 12V

FEATURES

s 3-Terminal Adjustable or Fixed

2.85V, 3.3V, 3.6V, 5V, 12V

s Output Current of 1.5A, (0.5A for LT1086H)

s Operates Down to 1V Dropout

s Guaranteed Dropout Voltage at Multiple Current Levels

s Line Regulation: 0.015%

s Load Regulation: 0.1%

s 100% Thermal Limit Functional Test

U

APPLICATIONS

s SCSI-2 Active Terminator

s High Efficiency Linear Regulators

s Post Regulators for Switching Supplies

s Constant Current Regulators

s Battery Chargers

s Microprocessor Supply

DESCRIPTION

The LT ®1086 is designed to provide 1.5A with higher

efficiency than currently available devices. All internal

circuitry is designed to operate down to 1V input-to-

output differential and the dropout voltage is fully speci-

fied as a function of load current. Dropout is guaranteed at

a maximum of 1.5V at maximum output current, decreas-

ing at lower load currents. On-chip trimming adjusts the

reference/ouput voltage to 1%. Current limit is also

trimmed, minimizing the stress on both the regulator and

power source circuitry under overload conditions.

The LT1086 is pin compatible with older 3-terminal adjust-

able regulators. A 10µF output capacitor is required on

these new devices; however, this is usually included in

most regulator designs.

A 2.85V output version is offered for SCSI-2 active termi-

nation. For surface mount applications see the LT1117-

2.85 data sheet. For high current or lower dropout require-

ments see the LT1123-2.85 data sheet.

Unlike PNP regulators, where up to 10% of the output

current is wasted as quiescent current, the LT1086 quies-

cent current flows into the load, increasing efficiency.

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

TYPICAL APPLICATION

5V to 3.3V Regulator

VIN ≥ 4.75V

IN

10µF*

TANTALUM

LT1086-3.3 OUT

GND

3.3V AT 1.5A

10µF

TANTALUM

LT1086 • TA01

*MAY BE OMITTED IF INPUT SUPPLY IS WELL

BYPASSED WITHIN 2" OF THE LT1086

LT1086 Dropout Voltage

2

INDICATES GUARANTEED TEST POINT

–55°C ≤ TJ ≤ 150°C

0°C ≤ TJ ≤ 125°C

1

TJ = – 55°C

TJ = 25°C

TJ = 150°C

0

0

0.5

1

1.5

OUTPUT CURRENT (A)

LT1086 • TA02

1

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