LT3003 - 3-Channel LED Ballaster with PWM


  • 3% LED Current Matching
  • Up to 350mA Continuous Current per LED String
  • Up to 3000:1 True Color PWM Dimming Range
  • PWM Input Disconnects LED Strings
  • Can Operate in Buck, Boost and Buck-Boost Modes
  • Wide Input Range: 3V to 40V
  • Overtemperature Outputs
  • Works with LT1618, LT3477, LT3474, LT3475, LT3476, LTC3783
  • Thermally Enhanced 10-Pin MSOP Package

Typical Application

LT3003 Typical Application
LT3003 Typical Application


The LT3003 drives three separate strings of LEDs up to 350mA/channel with 3% accurate current matching, resulting in uniform LED brightness and intensity. This approach is superior to conventional methods of running three separate channels with external ballast resistors requiring expensive factory calibration.

The LT3003 operates in boost, buck and buck-boost mode. A True Color PWM Dimming ratio of up to 3000:1 is achievable using a logic-level signal at the PWM pin for all modes without the need for external level-shifting circuitry. For applications with input supply above and below the output voltage of the LED strings, the LT3003 allows the LEDs to be returned to the input supply (buck-boost mode) instead of being limited to only SEPIC solutions.

The LT3003 is ideal for high power LED driver applications such as TFT LCD backlighting and heads-up displays. Additional overtemperature outputs allow appropriate system management for increased reliability.

The LT3003 is available in a small 10-pin MSE 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
LT3003EMSE#PBF MS-10E MSE E 05-08-1664 Yes
LT3003EMSE#TRPBF MS-10E MSE E 05-08-1664 Yes

LT3003 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
LT3003EMSE#PBF MS-10E E $1.66 $1.16 Yes
LT3003EMSE#TRPBF MS-10E E $1.22 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
DC994A LT3003EMSE Demo Board $75.00
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Click here to view our complete list of demo boards


  • High Power LED Ballaster
  • Automotive Lighting
  • Video Cameras
  • TFT LCD Backlighting

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
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