LTC3201 - 100mA Ultralow Noise Charge Pump LED Supply with Output Current Adjust


  • Input Noise Filter Minimizes Supply Noise
  • Constant Frequency Operation
  • 3-Bit LED Current Control
  • No Inductors
  • Low Shutdown Current: IIN < 1µA
  • Output Current: 100mA
  • VIN Range: 2.7V to 4.5V
  • 1.8MHz Switching Frequency
  • Soft-Start Limits Inrush Current at Turn-On
  • Short-Circuit and Overtemperature Protected
  • Available in 10-Pin MSOP Package

Typical Application

LTC3201 Typical Application
LTC3201 Typical Application


The LTC3201 is an ultralow noise, constant frequency, charge pump DC/DC converter specifically designed for powering white LEDs. The part produces a low noise boosted supply capable of supplying 100mA of output current. LED current is regulated for accurate and stable backlighting. A 3-bit DAC provides output current adjust for brightness control.

Low external parts count (one small flying capacitor and three small bypass capacitors) and small MSOP-10 package size make the LTC3201 ideally suited for space constrained applications. An input noise filter further reduces input noise,thus enabling direct connection to the battery. High switching frequency enables the use of small external capacitors.

The LTC3201 contains overtemperature protection and can survive an indefinite output short to GND. Internal soft-start circuitry also prevents excessive inrush current on start-up. A low current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1µA.


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
LTC3201EMS#PBF MS-10 MS E 05-08-1661 Yes
LTC3201EMS#TRPBF MS-10 MS E 05-08-1661 Yes

LTC3201 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
LTC3201EMS#PBF MS-10 E $2.25 $1.90 Yes
LTC3201EMS#TRPBF MS-10 E $1.96 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
DC381A LTC3201EMS | 100mA White LED (5) Power Supply $75.00
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Click here to view our complete list of demo boards


  • White LED Backlighting
  • Programmable Boost Current Source

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