LT1083/LT1084/LT1085
7.5A, 5A, 3A Low Dropout
Positive Adjustable Regulators
FeaTures
DescripTion
The LT®1083 series of positive adjustable regulators are
designedtoprovide7.5A, 5Aand3Awithhigherefficiency
than currently available devices. All internal circuitry is
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3-Terminal Adjustable
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Output Current of 3A, 5A or 7.5A
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Operates Down to 1V Dropout
Guaranteed Dropout Voltage at Multiple Current Levels
Line Regulation: 0.015%
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designedtooperatedownto1Vinput-to-outputdifferential
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 cur-
rents. 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.
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Load Regulation: 0.1%
100% Thermal Limit Functional Test
Fixed Versions Available
Available in 3-Lead Plastic TO-220 and DD Packages
applicaTions
The LT1083/LT1084/LT1085 devices are pin compatible
with older 3-terminal regulators. A 10µF output capacitor
isrequiredonthesenewdevices.However,thisisincluded
in most regulator designs.
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High Efficiency Linear Regulators
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Post Regulators for Switching Supplies
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Constant Current Regulators
Battery Chargers
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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.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
UltraFast and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
DEVICE
OUTPUT CURRENT*
LT1083
LT1084
LT1085
7.5A
5.0A
3.0A
*For a 1.5A low dropout regulator see the LT1086 data sheet.
Typical applicaTion
Dropout Voltage vs Output Current
2
5V, 7.5A Regulator
LT1083
ADJ
5V AT 7.5A
OUT
V
≥ 6.5V
IN
IN
121Ω
1%
+
1
0
+
10µF
10µF*
TANTALUM
365Ω
1%
*REQUIRED FOR STABILITY
1083/4/5 ADJ TA01
0
I
FULL LOAD
OUTPUT CURRENT
1083/4/5 ADJ TA02
108345fh
1
For more information www.linear.com/LT1083