LT3489 - 2MHz Boost DC/DC Converter with 2.5A Switch and Soft-Start


  • 2.5A, 0.12Ω, 40V Internal Switch
  • 2MHz Switching Frequency
  • Integrated Soft-Start Function
  • VIN Range: 2.6V to 16V
  • Adjustable Output from VIN to 40V
  • Low VCESAT Switch: 110mV at 1A (Typical)
  • 8V at 610mA from a 3.3V Input
  • Internal or External Loop Compensation
  • Small 8-Lead MS8E

Typical Application

LT3489 Typical Application
LT3489 Typical Application


The LT3489 is a fixed frequency step-up DC/DC converter containing an internal 2.5A, 40V switch. The LT3489 is ideal for large TFT-LCD panel power supplies. The LT3489 switches at 2MHz, allowing the use of tiny, low profile inductors and low value ceramic capacitors. Loop compensation can be either internal or external, giving the user flexibility in setting loop compensation and allowing optimized transient response with low ESR ceramic output capacitors. Soft-start is controlled with an external capacitor, which determines the input current ramp rate during start-up.

The 8-lead MS8E package and high switching frequency ensure a low profile overall solution less than 1.1mm high.


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
LT3489EMS8E#PBF MS-8E MS8E E 05-08-1662 Yes
LT3489EMS8E#TRPBF MS-8E MS8E E 05-08-1662 Yes

LT3489 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
LT3489EMS8E#PBF MS-8E E $2.79 $1.95 Yes
LT3489EMS8E#TRPBF MS-8E E $2.01 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
DC925A LT3489EMS8E Demo Board | Triple Output, Boost Plus 23V Charge Pump & -8V Inverting Charge Pump $100.00
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Click here to view our complete list of demo boards


  • TFT-LCD Bias Supplies
  • GPS Receivers
  • DSL Modems
  • Local Power Supply

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Design Tools


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