LT3081 - 1.5A Single Resistor Rugged Linear Regulator with Monitors
Features
- 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
AEC-Q100 data available for specific packages
Typical Application
Description
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.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LT3081EDF#PBF | 4x4 DFN-12 | DF | E | 05-08-1733 | Yes |
| LT3081EDF#TRPBF | 4x4 DFN-12 | DF | E | 05-08-1733 | Yes |
| LT3081EFE#PBF | TSSOP-16 | FE | E | 05-08-1663 (BB) | Yes |
| LT3081EFE#TRPBF | TSSOP-16 | FE | E | 05-08-1663 (BB) | Yes |
| LT3081ER#PBF | DDPAK-7 | R | E | 05-08-1462 | Yes |
| LT3081ER#TRPBF | DDPAK-7 | R | E | 05-08-1462 | Yes |
| LT3081ET7#06PBF | TO-220 | T7 | E | 05-08-1422 (Flow 06) | Yes |
| LT3081ET7#PBF | TO-220 | T7 | E | 05-08-1422 (Standard) | Yes |
| LT3081HFE#PBF | TSSOP-16 | FE | H | 05-08-1663 (BB) | Yes |
| LT3081HFE#TRPBF | TSSOP-16 | FE | H | 05-08-1663 (BB) | Yes |
| LT3081HT7#PBF | TO-220 | T7 | H | 05-08-1422 (Standard) | Yes |
| LT3081IDF#PBF | 4x4 DFN-12 | DF | I | 05-08-1733 | Yes |
| LT3081IDF#TRPBF | 4x4 DFN-12 | DF | I | 05-08-1733 | Yes |
| LT3081IFE#PBF | TSSOP-16 | FE | I | 05-08-1663 (BB) | Yes |
| LT3081IFE#TRPBF | TSSOP-16 | FE | I | 05-08-1663 (BB) | Yes |
| LT3081IR#PBF | DDPAK-7 | R | I | 05-08-1462 | Yes |
| LT3081IR#TRPBF | DDPAK-7 | R | I | 05-08-1462 | Yes |
| LT3081IT7#PBF | TO-220 | T7 | I | 05-08-1422 (Standard) | Yes |
| LT3081MPFE#PBF | TSSOP-16 | FE | MP | 05-08-1663 (BB) | Yes |
| LT3081MPFE#TRPBF | TSSOP-16 | FE | MP | 05-08-1663 (BB) | Yes |
| LT3081MPT7#PBF | TO-220 | T7 | MP | 05-08-1422 (Standard) | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT3081EDF#PBF | 4x4 DFN-12 | E | $3.71 | $2.60 | Yes | |
| LT3081EDF#TRPBF | 4x4 DFN-12 | E | $2.66 | Yes | ||
| LT3081EFE#PBF | TSSOP-16 | E | $3.82 | $2.67 | Yes | |
| LT3081EFE#TRPBF | TSSOP-16 | E | $2.73 | Yes | ||
| LT3081ER#PBF | DDPAK-7 | E | $4.10 | $2.87 | Yes | |
| LT3081ER#TRPBF | DDPAK-7 | E | $2.93 | Yes | ||
| LT3081ET7#06PBF | TO-220 | E | $4.10 | $2.87 | Yes | |
| LT3081ET7#PBF | TO-220 | E | $4.10 | $2.87 | Yes | |
| LT3081HFE#PBF | TSSOP-16 | H | $4.86 | $3.40 | Yes | |
| LT3081HFE#TRPBF | TSSOP-16 | H | $3.46 | Yes | ||
| LT3081HT7#PBF | TO-220 | H | $5.19 | $3.63 | Yes | |
| LT3081IDF#PBF | 4x4 DFN-12 | I | $4.27 | $2.99 | Yes | |
| LT3081IDF#TRPBF | 4x4 DFN-12 | I | $3.05 | Yes | ||
| LT3081IFE#PBF | TSSOP-16 | I | $4.39 | $3.07 | Yes | |
| LT3081IFE#TRPBF | TSSOP-16 | I | $3.13 | Yes | ||
| LT3081IR#PBF | DDPAK-7 | I | $4.71 | $3.30 | Yes | |
| LT3081IR#TRPBF | DDPAK-7 | I | $3.36 | Yes | ||
| LT3081IT7#PBF | TO-220 | I | $4.71 | $3.30 | Yes | |
| LT3081MPFE#PBF | TSSOP-16 | MP | $10.29 | $7.20 | Yes | |
| LT3081MPFE#TRPBF | TSSOP-16 | MP | $7.26 | Yes | ||
| LT3081MPT7#PBF | TO-220 | MP | $11.06 | $7.74 | Yes | |
| Buy Now • Request Samples | ||||||
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.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1870A | LT3081EFE 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 | |
| DC2132A | 24V 3A Constant Voltage, Constant Current Bench Supply Featuring LT3081, LT8612, LT3092 | $200.00 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT3081HFE#PBF | TSSOP-16 | H | $4.86 | $3.40 | Yes | |
| LT3081HFE#TRPBF | TSSOP-16 | H | $3.46 | Yes | ||
| LT3081IFE#PBF | TSSOP-16 | I | $4.39 | $3.07 | Yes | |
| LT3081IFE#TRPBF | TSSOP-16 | I | $3.13 | Yes | ||
| LT3081MPFE#PBF | TSSOP-16 | MP | $10.29 | $7.20 | Yes | |
| LT3081MPFE#TRPBF | TSSOP-16 | MP | $7.26 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- All Surface Mount Power Supply
- Rugged Industrial Power Supply
- Post Regulator for Switching Supplies
- Low Output Voltage Supply
- Intrinsic Safety Applications
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Design Tools
LTspice
LTspice® software 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
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
- Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- LT3081 Demo Circuit - Wide Safe Operating Area Supply (2.7-40V to 1.5V @ 1.5A)
- LT3081 Demo Circuit - Wide Safe Operating Area Supply Using Paralleling Regulators (2.7-40V to 1.5V @ 3A)
- LT3081/LT8612/LTC3632/LT3092 Demo Circuit - Constant Voltage, Constant Current Bench Supply (10-40V to 0-25V @ 0-3.1A)
- Step 3: If LTspice 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:
LT3081
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
