LT3511 - Monolithic High Voltage Isolated Flyback Converter

Features

  • 4.5V to 100V Input Voltage Range
  • Internal 240mA, 150V Power Switch
  • Boundary Mode Operation
  • No Transformer Third Winding or Opto-Isolator Required for Regulation
  • Improved Primary-Side Winding Feedback Load Regulation
  • VOUT Set with Two External Resistors
  • BIAS Pin for Internal Bias Supply and Power Switch Driver
  • No External Start-Up Resistor
  • 16-Lead MSOP Package
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LT3511 Typical Application
LT3511 Typical Application

Description

The LT3511 is a high voltage monolithic switching regulator specifically designed for the isolated flyback topology. No third winding or opto-isolator is required for regulation as the part senses output voltage directly from the primary-side flyback waveform. The device integrates a 240mA, 150V power switch, high voltage circuitry, and control into a high voltage 16-lead MSOP package with four leads removed.

The LT3511 operates from an input voltage range of 4.5V to 100V and delivers up to 2.5W of isolated output power. Two external resistors and the transformer turns ratio easily set the output voltage. Off-the-shelf transformers are available for several applications. The high level of integration and the use of boundary mode operation results in a simple, clean, tightly regulated application solution to the traditionally tough problem of isolated power delivery.

Packaging

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
Drawing
RoHS
LT3511EMS#PBF MS-16 MS E 05-08-1847 Yes
LT3511EMS#TRPBF MS-16 MS E 05-08-1847 Yes
LT3511HMS#PBF MS-16 MS H 05-08-1847 Yes
LT3511HMS#TRPBF MS-16 MS H 05-08-1847 Yes
LT3511IMS#PBF MS-16 MS I 05-08-1847 Yes
LT3511IMS#TRPBF MS-16 MS I 05-08-1847 Yes
LT3511MPMS MS-16 MS MP 05-08-1847 No
LT3511MPMS#PBF MS-16 MS MP 05-08-1847 Yes
LT3511MPMS#TR MS-16 MS MP 05-08-1847 No
LT3511MPMS#TRPBF MS-16 MS MP 05-08-1847 Yes


LT3511 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
(1-99)
Price
(1k)*
RoHS
LT3511EMS#PBF MS-16 E $4.22 $2.95 Yes
LT3511EMS#TRPBF MS-16 E $3.01 Yes
LT3511HMS#PBF MS-16 H $5.22 $3.65 Yes
LT3511HMS#TRPBF MS-16 H $3.71 Yes
LT3511IMS#PBF MS-16 I $4.70 $3.29 Yes
LT3511IMS#TRPBF MS-16 I $3.35 Yes
LT3511MPMS MS-16 MP $12.79 $8.95 No
LT3511MPMS#PBF MS-16 MP $12.79 $8.95 Yes
LT3511MPMS#TR MS-16 MP $12.85 $9.01 No
LT3511MPMS#TRPBF MS-16 MP $12.85 $9.01 Yes
Buy NowRequest Samples
* 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
DC1517A LT3511EMS Demo Board | 36V to 75VIN, VOUT= 5V @ 300mA Contact Factory
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

Please contact your local sales representative for more information regarding reliability reports and AEC-Q100 data or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT3511HMS#PBF MS-16 H $5.22 $3.65 Yes
LT3511HMS#TRPBF MS-16 H $3.71 Yes
LT3511IMS#PBF MS-16 I $4.70 $3.29 Yes
LT3511IMS#TRPBF MS-16 I $3.35 Yes
LT3511MPMS#PBF MS-16 MP $12.79 $8.95 Yes
LT3511MPMS#TRPBF MS-16 MP $12.85 $9.01 Yes
Buy NowRequest Samples
* 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.

Applications

  • Isolated Telecom Power Supplies
  • Isolated Auxiliary/Housekeeping Power Supplies
  • Isolated Industrial, Automotive and Medical Power Supplies

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LT3511

Technical Support