LT3081
1.5A Single Resistor Rugged Linear Regulator with Monitors
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Overview
Features and Benefits
- Extended Safe Operating Area
- Maximum Output Current: 1.5A
- Stable with or without Input/Output Capacitors
- Wide Input Voltage Range: 1.2V to 36V
- Single Resistor Sets Output Voltage
- Output Current Monitor: IMON = IOUT/5000
- Junction Temperature Monitor: 1μA/°C
- Output Adjustable to 0V
- 50μA SET Pin Current: 1% Initial Accuracy
- Output Voltage Noise: 27μVRMS
- Parallel Multiple Devices for Higher Current or Heat Spreading
- Programmable Current Limit
- Reverse-Battery and Reverse-Current Protection
- <1mV Load Regulation Typical Independent of VOUT
- <0.001%/V Line Regulation Typical
- Available in Thermally-Enhanced 12-Lead 4mm × 4mm DFN and 16-Lead TSSOP, 7-Lead DD-Pak and 7-Lead TO-220
Product Details
The LT3081 is a 1.5A low dropout linear regulator designed for rugged industrial applications. Key features of the IC are the extended safe operating area (SOA), output current monitor, temperature monitor and programmable current limit. The LT3081 can be paralleled for higher output current or heat spreading. The device withstands reverse input and reverse output-to-input voltages without reverse current flow.
The LT3081’s precision 50μA reference current source allows a single resistor to program output voltage to any level between zero and 34.5V. The current reference architecture makes load regulation independent of output voltage. The LT3081 is stable with or without input and output capacitors.
The output current monitor (IOUT/5000) and die junction temperature output (1μA/°C) provide system monitoring and debug capability. In addition, a single resistor programs current limit.
Internal protection circuitry includes reverse-battery and reverse-current protection, current limiting and thermal limiting. The LT3081 is offered in the 16-lead TSSOP (with exposed pad for improved thermal performance), 7-lead TO-220, 7-lead DD-Pak, and an 12-lead 4mm × 4mm DFN.
Applications
- All Surface Mount Power Supply
- Rugged Industrial Power Supply
- Post Regulator for Switching Supplies
- Low Output Voltage Supply
- Intrinsic Safety Applications
Product Categories
Markets and Technologies
Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (2)
Documentation & Resources
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R531 Reliability Data3/26/2018PDF23 K
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DC2132A - Demo Manual5/22/2014PDF546K
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DC1870A - Demo Manual7/12/2013PDF281K
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High Performance Low Dropout Linear Regulators (LDOs)7/13/2017PDF0M
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New 3-Terminal Regulators Add Functionality7/13/2017PDF814K
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Linear Low Dropout (LDO) Regulator Solutions4/17/2018PDF3 M
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Current Sensing with PMBus Digital Power System Managers—Part 21/1/2022 Analog Dialogue
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Paralleling Linear Regulators Made Easy5/21/2015
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Three-Terminal Linear Regulator Evolution Continues Unabated2/19/2015PDF1M
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Loop Gain and its Effect on Analog Control Systems1/26/2015
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Output Voltage Noise Measurements for Linear Regulators9/20/2014
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High Performance Portable DC Bench Power Supply: Save Money and Free Up Bench Real Estate by Building Your Own7/1/2014 LT Journal
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New Linear Regulators Solve Old Problems8/14/2013 LT Journal
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1.5A LDO+ Regulator Monitors Current and Temperature10/15/2018 -
LT3081 Video Product Brief10/15/2018 -
Low Voltage Power Supplies10/15/2018
Tools & Simulations
LTspice
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, 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.
LTspice Simulations
Models for the following parts are available in LTspice:
LT3081
Reference Designs (1)
Design Resources
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PCN-PDN Information
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Support & Discussions
LT3081 Discussions
Sample & Buy
Ordering FAQs
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Buy Now Pricing
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List Pricing
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Lead Times
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Sampling
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Evaluation Boards
Pricing displayed is based on 1-piece.
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.