LT1085_15 Datasheet, PDF (1/22 Pages) Linear Technology – 7.5A, 5A, 3A Low Dropout Positive Adjustable Regulators

LT1083/LT1084/LT1085
7.5A, 5A, 3A Low Dropout
Positive Adjustable Regulators
Features
nn _{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}
Applications
nn _{High Efficiency Linear Regulators}
nn _{Post Regulators for Switching Supplies}
nn _{Constant Current Regulators}
nn _{Battery Chargers}
DEVICE
OUTPUT CURRENT*
LT1083
7.5A
LT1084
5.0A
LT1085
3.0A
*For a 1.5A low dropout regulator see the LT1086 data sheet.
Description
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 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.
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.
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.
Typical Application
5V, 7.5A Regulator
V_IN ≥ 6.5V
+
IN
10µF
LT1083 OUT
ADJ
*REQUIRED FOR STABILITY
121Ω
1% ₊
365Ω
1%
5V AT 7.5A
10µF*
TANTALUM
1083/4/5 ADJ TA01
Dropout Voltage vs Output Current
2
1
0
0
I_{FULL LOAD}
OUTPUT CURRENT
1083/4/5 ADJ TA02
For more information www.linear.com/LT1083
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