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LT1083/LT1084/LT1085

108345fe

Packages

The LT

designed to provide 7.5A, 5A and 3A with higher efficiency

than currently available devices. All internal circuitry is

designed to operate down to 1V input-to-output differen-

tial 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 reference voltage

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

on both the regulator and power source circuitry under

overload conditions.

The LT1083/LT1084/LT1085 devices are pin compatible

with older three-terminal regulators. A 10

µF output ca-

pacitor is required on these new devices. However, this is

included in most regulator designs.

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

current is wasted as quiescent current, the LT1083 quies-

cent current flows into the load, increasing efficiency.

7.5A, 5A, 3A Low Dropout

Positive Adjustable Regulators

121

Ω

1%

IN

OUT

ADJ

365

Ω

1%

10

µF

5V AT 7.5A

LT1083

1083/4/5 ADJ TA01

+

10

µF*

TANTALUM

+

*REQUIRED FOR STABILITY

5V, 7.5A Regulator

DEVICE

OUTPUT CURRENT*

LT1083

7.5A

LT1084

5.0A

LT1085

3.0A

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

OUTPUT CURRENT

0

2

1

0

1083/4/5 ADJ TA02

Dropout Voltage vs Output Current

APPLICATIO S

FEATURES

TYPICAL APPLICATIO

DESCRIPTIO

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

All other trademarks are the property of their respective owners.