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
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.
- All Surface Mount Power Supply
- Rugged Industrial Power Supply
- Post Regulator for Switching Supplies
- Low Output Voltage Supply
- Intrinsic Safety Applications
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)
DC2132A is a 24V 3A constant voltage, constant current bench supply. It regulates any output voltage from 0V to 24V and any output current from 0A to 3A. It runs from 10V to 40V input although the output voltage should remain 5V or more below the input voltage.
DC1870A is a 1.5A low dropout linear regulator featuring the LT3081. The device is designed for rugged industrial applications and can be paralleled for higher output current or heat spreading. Besides paralleling, the LT3081 also presents other features including adjustability to zero VOUT, reverse protection for input and output-to-input voltages, temperature monitor, output current monitor, etc. A key feature of the LT3081 is the extended safe operating area (SOA). With the precision zero TC 50μA reference current source, a single resistor programs the output voltage to any level between zero and 34.5V. Internal protection circuitry includes reverse-battery and reverse-current protection, current limiting and thermal limiting.
Documentation & Resources
R531 Reliability Data3/26/201823 K
DC2132A - Demo Manual5/22/2014546K
DC1870A - Demo Manual7/12/2013281K
High Performance Low Dropout Linear Regulators (LDOs)7/13/20170M
New 3-Terminal Regulators Add Functionality7/13/2017814K
Linear Low Dropout (LDO) Regulator Solutions4/17/20183 M
Current Sensing with PMBus Digital Power System Managers—Part 21/1/2022 Analog Dialogue
Paralleling Linear Regulators Made Easy5/21/2015
Three-Terminal Linear Regulator Evolution Continues Unabated2/19/20151M
Loop Gain and its Effect on Analog Control Systems1/26/2015
Output Voltage Noise Measurements for Linear Regulators9/20/2014
High Performance Portable DC Bench Power Supply: Save Money and Free Up Bench Real Estate by Building Your Own7/1/2014 LT Journal
New Linear Regulators Solve Old Problems8/14/2013 LT Journal
1.5A LDO+ Regulator Monitors Current and Temperature10/15/2018
LT3081 Video Product Brief10/15/2018
Low Voltage Power Supplies10/15/2018
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Reference Designs (1)
CN050875 Watt, Single-Output Benchtop Power Supply
CN050875 Watt, Single-Output Benchtop Power Supply
Features & Benefits
- 75 Watt Power Supply
- Constant Current (>3A) and Constant Voltage (>25V) Modes
- True 0V and 0A operation
- Manual or Software Controlled
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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.