LT3591 - White LED Driver with Integrated Schottky in 3mm x 2mm DFN


  • Drives Up to Ten White LEDs from a 3V Supply
  • High Side Sense Allows “One Wire Current Source”
  • Internal Schottky Diode
  • One Pin Dimming and Shutdown
  • 80:1 True Color PWMTM Dimming Range
  • 42V Open LED Protection
  • 1MHz Switching Frequency
  • ±5% Reference Accuracy
  • VIN Range: 2.5V to 12V
  • Requires Only 2.2µF Output Capacitor
  • Low Profile 8-Lead DFN Package
  • (3mm × 2mm × 0.75mm)

Typical Application

LT3591 Typical Application
LT3591 Typical Application


The LT3591 is a fixed frequency step-up DC/DC converter specifi cally designed to drive up to ten white LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The device features a unique high side LED current sense that enables the part to function as a “one wire current source;” one side of the LED string can be returned to ground anywhere, allowing a simpler one wire LED connection. Traditional LED drivers use a grounded resistor to sense LED current, requiring a 2-wire connection to the LED string.

The high switching frequency allows the use of tiny inductors and capacitors. A single pin performs both shutdown and accurate LED dimming control. Few external components are needed: open-LED protection and the Schottky diode are all contained inside a low profi le 3mm × 2mm DFN package.


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
LT3591EDDB#PBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LT3591EDDB#TRMPBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LT3591EDDB#TRPBF 3x2 DFN-8 DDB E 05-08-1702 Yes

LT3591 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
LT3591EDDB#PBF 3x2 DFN-8 E $2.00 Yes
LT3591EDDB#TRMPBF 3x2 DFN-8 E $2.00 $1.45 Yes
LT3591EDDB#TRPBF 3x2 DFN-8 E $2.00 $1.40 Yes
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* 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
DC1124A LT3591EDDB Demo Board | Boost LED Driver, 3V ≤ VIN ≤ 9V, VOUT = 40V @ 20mA $75.00
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Click here to view our complete list of demo boards


  • Tape and Reel: Add #TR
  • Lead Free: Add #PBF
  • Lead Free Tape and Reel: Add #TRPBF

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Design Tools


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