LT3081 - 1.5A Single Resistor Rugged Linear Regulator with Monitors

The LT®3081 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.

  • 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
Typical Application
LT3081 Typical Application
LT3081 Typical Application
  • All Surface Mount Power Supply
  • Rugged Industrial Power Supply
  • Post Regulator for Switching Supplies
  • Low Output Voltage Supply
  • Intrinsic Safety Applications
LT3081 Package Drawing
LT3081 Package Drawing
LT3081 Package Drawing
LT3081 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LT3081EDF#PBF4x4 DFN-12E$3.71$2.60
LT3081EDF#TRPBF4x4 DFN-12E$2.66
LT3081IDF#PBF4x4 DFN-12I$4.27$2.99
LT3081IDF#TRPBF4x4 DFN-12I$3.05
Demo Boards
Part NumberDescriptionPrice
DC1870ALT3081EFE Demo Board | Single Resistor Rugged Linear Regulator with Monitors, 2.8V ≤ VIN ≤ 36V, Vout = 1.2V/1.5V/1.8V/2.5V/3.3V/5V/12V @ 1.5A$150.00
DC2132A24V 3A Constant Voltage, Constant Current Bench Supply Featuring LT3081, LT8612, LT3092$200.00
Application Note
Reliability Data
Product Selector Card
LT Journal
Press Release
CAD Symbol
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LT3081/LT8612/LTC3632/LT3092 Demo Circuit - Constant Voltage, Constant Current Bench Supply (10-40V to 0-25V @ 0-3.1A)