LT1083/LT1084/LT1085 Fixed

1

1083ffe

For more information www.linear.com/LT1083

Typical applicaTion

DescripTion

3A, 5A, 7.5A Low Dropout

Positive Fixed Regulators

The LT®1083 series of positive adjustable regulators are

designed to provide 3A, 5A and 7.5A 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 specified as a function

of load current. Dropout is guaranteed at a maximum of

1.5V at maximum output current, decreasing at lower load

currents. On-chip trimming adjusts the output voltage to

1%. Current limit is also trimmed, minimizing the stress

on both the regulator and power source circuitry under

overload conditions.

The LT1083 series devices are pin compatible with older

three-terminal regulators. A 10µF output capacitor is

required on these new devices; however, this is usually

included in most regulator designs.

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

rent is wasted as quiescent current, the LT1083 quiescent

current flows into the load, increasing efficiency.

FeaTures

applicaTions

n

Three-Terminal 3.3V, 3.6V, 5V and 12V

n

Output Current of 3A, 5A or 7.5A

n

Operates Down to 1V Dropout

n

Guaranteed Dropout Voltage at Multiple Current Levels

n

Line Regulation: 0.015%

n

Load Regulation: 0.1%

n

100% Thermal Limit Functional Test

n

Adjustable Versions Available

n

High Efficiency Linear Regulators

n

Post Regulators for Switching Supplies

n

Constant Current Regulators

n

Battery Chargers

DEVICE

OUTPUT CURRENT*

LT1083

LT1084

LT1085

7.5 Amps

5.0 Amps

3.0 Amps

*For a 1.5A low dropout regulator see the LT1086 data sheet.

5V, 7.5A Regulator

5V AT 7.5A

LT1083-5

LT1083/4/5 TA01

22µF*

TANTALUM

+

10µF

+

*REQUIRED FOR STABILITY

Dropout Voltage vs Output Current

OUTPUT CURRENT (A)

0

2

1

0

1083/4/5 TA02

L

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and UltraFast is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.