LTC3206 - I²C Multidisplay LED Controller


  • Step-Up/Direct-Connect Fractional Charge Pump Provides Up to 92% Efficiency
  • Up to 400mA Continuous Output Current
  • Independent Current and Dimming Control for
    1-6 LED MAIN, 1-4 LED SUB and RGB LED Displays
  • LED Currents Programmable Using 2-Wire I²C™ Serial Interface
  • 1% LED Current Matching
  • Low Noise Constant Frequency Operation*
  • Minimal Component Count
  • Automatic Soft-Start Limits Inrush Current
  • 16 Exponentially Spaced Dimming States Provides
    128:1 Brightness Range for MAIN and SUB Displays
  • Up to 4096 Color Combinations for RGB Display
  • Low Operating Current: IVIN = 180µA
  • Tiny, Low Profile 24-Lead (4mm × 4mm × 0.75mm) QFN Package

Typical Application

LTC3206 Typical Application
LTC3206 Typical Application


The LTC3206 is a highly integrated multidisplay LED controller. The part contains a high efficiency, low noise fractional step-up/direct-connect charge pump to provide power for both main and sub white LED displays plus an RGB color LED display. The LTC3206 requires only four small ceramic capacitors plus two resistors to form a complete 3-display LED power supply and current controller.

Maximum currents for the main/sub displays and RGB display are set independently. Current for each LED is controlled with an internal current source. Dimming and ON/OFF control for all displays is achieved via a 2-wire serial interface. Two auxiliary LED pins can be individually assigned to either the MAIN or SUB displays. 16 individual dimming states exist for both the MAIN and SUB displays. Each of the RED, GREEN and BLUE LEDs have 16 dimming states as well, resulting in up to 4096 color combinations.

The LTC3206 charge pump optimizes efficiency based on VIN and LED forward voltage conditions. The part powers up in direct-connect mode and automatically switches to 1.5x step-up mode once any enabled LED current source begins to enter dropout. Internal circuitry prevents inrush current and excess input noise during start-up and mode switching. The LTC3206 is available in a 24-lead (4mm × 4mm) QFN package.

* U.S. Patent 6,411,531


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
LTC3206EUF#PBF 4x4 QFN-24 UF E 05-08-1697 Yes
LTC3206EUF#TRPBF 4x4 QFN-24 UF E 05-08-1697 Yes

LTC3206 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
LTC3206EUF#PBF 4x4 QFN-24 E $2.62 $2.20 Yes
LTC3206EUF#TRPBF 4x4 QFN-24 E $2.28 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
DC749A LTC3206EUF | I2C Multidisplay LED Controller, Vin = 2.7V - 4.5V (requires DC590 Controller) $125.00
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Companion Boards

Part Number Description Price Documentation
DC590B Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards $50.00
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Click here to view our complete list of demo boards


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