LT3590 - 48V Buck Mode LED Driver in SC70 and 2mm x 2mm DFN


  • 4.5V to 55V Input Voltage Range
  • Up to 50mA LED Current
  • 80mA, 55V Switch
  • Internal Schottky Diode
  • 15µA Supply Current in Shutdown
  • 500µA Supply Current Operating, Not Switching
  • Switching Frequency: 850kHz
  • 200mV Feedback Voltage with ±5% Accuracy
  • CTRL Input Performs Dimming and Shutdown
  • 91% Efficiency (10 LEDs, 50mA)
  • Requires Only 1µF Output Capacitor
  • 8-Lead SC70 Package
  • 6-Lead 2mm × 2mm DFN Package

Typical Application

LT3590 Typical Application
LT3590 Typical Application


The LT3590 is a fixed frequency buck mode converter specifically designed to drive up to 10 LEDs in series from a 48V DC source. Series connection of the LEDs provides identical LED currents of up to 50mA, resulting in uniform brightness and eliminating the need for ballast resistors. A fixed frequency, current mode architecture results in stable operation over a wide range of input voltage and output voltage.

The high switching frequency of 850kHz permits the use of tiny, low profile inductors and capacitors. A single pin performs both shutdown and accurate LED dimming control. The power switch, Schottky diode and control circuitry are all contained inside a space saving SC70 package or 2mm x 2mm DFN package to allow a small converter footprint and lower parts cost.


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
LT3590EDC#PBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LT3590EDC#TRMPBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LT3590EDC#TRPBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LT3590ESC8#PBF SC-70 SC8 E 05-08-1639 Yes
LT3590ESC8#TRMPBF SC-70 SC8 E 05-08-1639 Yes
LT3590ESC8#TRPBF SC-70 SC8 E 05-08-1639 Yes

LT3590 Package Drawing
LT3590 Package Drawing

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
LT3590EDC#PBF 2x2 DFN-6 E $2.00 Yes
LT3590EDC#TRMPBF 2x2 DFN-6 E $2.00 $1.45 Yes
LT3590EDC#TRPBF 2x2 DFN-6 E $2.00 $1.40 Yes
LT3590ESC8#PBF SC-70 E $2.00 Yes
LT3590ESC8#TRMPBF SC-70 E $2.00 $1.45 Yes
LT3590ESC8#TRPBF SC-70 E $2.00 $1.40 Yes
Buy NowRequest Samples
* 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.

Part Number Description Price Documentation
DC1166A LT3590EDC Demo Board | Buck Mode LED Driver, Tiny Package, 4.5V ≤ VIN ≤ 54V, VLED up to 40V @ 50mA $75.00
Buy Now
Click here to view our complete list of demo boards


  • LED Fixed Signage
  • Traffic Signs
  • Neon Sign Replacement

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email with questions and comments.

Design Tools


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
  • 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:

Technical Support