LT1083/LT1084/LT1085
7.5A, 5A, 3A Low Dropout
Positive Adjustable Regulators
Features
Description
3-Terminal Adjustable
nn Output Current of 3A, 5A or 7.5A
nn Operates Down to 1V Dropout
nn Guaranteed Dropout Voltage at Multiple Current Levels
nn Line Regulation: 0.015%
nn Load Regulation: 0.1%
nn 100% Thermal Limit Functional Test
nn Fixed Versions Available
nn Available in 3-Lead Plastic TO-220 and DD Packages
The LT®1083 series of positive adjustable regulators are
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 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 reference voltage to
1%. Current limit is also trimmed, minimizing the stress
on both the regulator and power source circuitry under
overload conditions.
nn
Applications
The LT1083/LT1084/LT1085 devices are pin compatible
with older 3-terminal regulators. A 10µF output capacitor
is required on these new devices. However, this is included
in most regulator designs.
High Efficiency Linear Regulators
nn Post Regulators for Switching Supplies
nn Constant Current Regulators
nn Battery Chargers
nn
DEVICE
OUTPUT CURRENT*
LT1083
LT1084
LT1085
7.5A
5.0A
3.0A
Unlike PNP regulators, where up to 10% of the output current 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.
*For a 1.5A low dropout regulator see the LT1086 data sheet.
Typical Application
5V, 7.5A Regulator
VIN ≥ 6.5V
IN
+
LT1083
ADJ
10µF
5V AT 7.5A
OUT
121Ω
1%
+
10µF*
TANTALUM
365Ω
1%
*REQUIRED FOR STABILITY
1083/4/5 ADJ TA01
INPUT/OUTPUT VOLTAGE DIFFERENTIAL (V)
Dropout Voltage vs Output Current
2
1
0
0
IFULL LOAD
OUTPUT CURRENT
1083/4/5 ADJ TA02
108345fh
For more information www.linear.com/LT1083
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