LT1084 - 7.5A, 5A, 3A Low Dropout Positive Adjustable Regulators

Features

  • 3-Terminal Adjustable
  • Output Current of 3A, 5A or 7.5A
  • Operates Down to 1V Dropout
  • Guaranteed Dropout Voltage at Multiple Current Levels
  • Line Regulation: 0.015%
  • Load Regulation: 0.1%
  • 100% Thermal Limit Functional Test
  • Fixed Versions Available
  • Available in 3-Lead Plastic TO-220, TO-3P and DD Packages
  • For new designs, please use the TO-220 package instead of the TO-3P package

Typical Application

LT1084 Typical Application
LT1084 Typical Application

Description

The LT1083 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.

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 current is wasted as quiescent current, the LT1083 quiescent current flows into the load, increasing efficiency.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

T-3, TO3-P

LT1084 Package Drawing
LT1084 Package Drawing
LT1084 Package Drawing
LT1084 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT1084CP#PBF TO-3P 3 C $8.55 $7.07 View
LT1084CP-12#PBF TO-3P 3 C $8.55 $7.07 View
LT1084CP-5#PBF TO-3P 3 C $8.55 $7.07 View
LT1084CT TO-220 3 C $5.20 $4.25 View
LT1084CT#PBF TO-220 3 C $5.20 $4.25 View
LT1084CT-12 TO-220 3 C $5.20 $4.25 View
LT1084CT-12#PBF TO-220 3 C $5.20 $4.25 View
LT1084CT-3.3 TO-220 3 C $5.20 $4.25 View
LT1084CT-3.3#PBF TO-220 3 C $5.20 $4.25 View
LT1084CT-5 TO-220 3 C $5.20 $4.25 View
LT1084CT-5#PBF TO-220 3 C $5.20 $4.25 View
LT1084IT TO-220 3 I $6.65 $5.35 View
LT1084IT#PBF TO-220 3 I $6.65 $5.35 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • High Efficiency Linear Regulators
  • Post Regulators for Switching Supplies
  • Constant Current Regulators
  • Battery Chargers

Product Notifications

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Design Tools

LTspiceIV

LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice IV

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice IV does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As". After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice IV:
LT1084
LT1084-12
LT1084-3.3
LT1084-5

Technical Support