LT1083/LT1084/LT1085 Fixed
3A, 5A, 7.5A Low Dropout
Positive Fixed Regulators
Features
Description
Three-Terminal 3.3V, 3.6V, 5V and 12V
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 Adjustable Versions Available
Applications
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.
High Efficiency Linear Regulators
Post Regulators for Switching Supplies
nn Constant Current Regulators
nn Battery Chargers
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.
nn
nn
nn
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.
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, the Linear logo and OPTI-LOOP are registered trademarks
and UltraFast is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Typical Application
5V, 7.5A Regulator
5V AT 7.5A
LT1083-5
+
+
10µF
22µF*
TANTALUM
LT1083/4/5 TA01
*REQUIRED FOR STABILITY
INPUT/OUTPUT VOLTAGE DIFFERENTIAL (V)
VIN ≥ 6.5V
Dropout Voltage vs Output Current
2
1
0
0
IFULLLOAD/2
OUTPUT CURRENT (A)
IFULLLOAD
1083/4/5 TA02
1083ffe
For more information www.linear.com/LT1083
1
