LINEAR LT1083 84 85 Fixed DATA SHEET
Summary
These fixed, low dropout linear regulators deliver highly efficient power regulation in current ranges from 3A to 7.5A. Featuring guaranteed operation down to 1V dropout, they ensure stable voltage output across varying loads. The accompanying technical manual provides detailed electrical characteristics, absolute maximum ratings, and performance graphs needed for system design. Ideal for electronics engineers developing high-reliability switched power supplies that require dependable and efficient DC voltage conversion.
Page 1 Text Content
LT1083/84/85 Fixed
3A, 5A, 7.5A Low Dropout Positive Fixed Regulators
FEATURES DESCRIPTION
Three-Terminal 3.3V, 3.6V, 5V and 12V The LT1083 series of positive adjustable regulators are Output Current of 3A, 5A or 7.5A designed to provide 3A, 5A and 7.5A with higher efficiency Operates Down to 1V Dropout than currently available devices. All internal circuitry is
Guaranteed Dropout Voltage at Multiple Current Levels designed to operate down to 1V input to output differential Line Regulation: 0.015% and the dropout voltage is fully specified as a function of Load Regulation: 0.1% load current. Dropout is guaranteed at a maximum of 1.5V 100% Thermal Limit Functional Test at maximum output current, decreasing at lower load Adjustable Versions Available currents. On-chip trimming adjusts the output voltage to 1%. Current limit is also trimmed, minimizing the stress APPLICATIONS on both the regulator and power source circuitry under overload conditions.
High Efficiency Linear Regulators
The 1083 series devices are pin compatible with older
Post Regulators for Switching Supplies
IN PU T/ OU TP UT OL TA GE IF FE RE NT IA (V
three-terminal regulators. A 10µF output capacitor is
Constant Current Regulators
required on these new devices; however, this is usually
Battery Chargers
included in most regulator designs.
DEVICE OUTPUT CURRENT*
Unlike PNP regulators, where up to 10% of the output
LT1083 7.5 Amps
LT1084 5.0 Amps current is wasted as quiescent current, the LT1083 quies-
LT1085 3.0 Amps cent current flows into the load, increasing efficiency.
*For a 1.5A low dropout regulator see the LT1086 data sheet.
TYPICAL APPLICATION
5V, 7.5A Regulator Dropout Voltage vs Output Current
VIN ≥ 6.5V 5V AT 7.5ALT1083-5
TANTALUM
*REQUIRED FOR STABILITY
LT1083/4/5 TA01
IFULL LOAD/2 IFULL LOAD
OUTPUT CURRENT (A)
1083/4/5 TA02
Page Summary Contents For LINEAR LT1083 84 85 Fixed DATA SHEET
Manual Details
| Brand | Linear |
|---|---|
| Pages | 12 |
| File Size | 287.89 KB |
| Published | June 18, 2026 |
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Frequently Asked Questions
What is the guaranteed minimum dropout voltage?
The regulator is designed to operate down to a differential of 1V between input and output.
Does the circuit require an external capacitor for stability?
Yes, the manual requires a 10μF TANTALUM capacitor for stable operation.
How does the LT1083 improve efficiency over PNP regulators?
It increases efficiency because only up to 10% of output current is wasted as quiescent current into the load.
Are these devices compatible with older regulator designs?
Yes, the LT1083 series devices are pin compatible with older three-terminal post regulators.