LT3710 - Secondary Side Synchronous Post Regulator


  • Generates a Regulated Auxiliary Output in Isolated DC/DC Converters
  • 0.8V ±1.5% Accurate Voltage Reference
  • Dual N-Channel MOSFET Synchronous Drivers
  • High Switching Frequency: Up to 500kHz
  • Programmable Current Limit Protection
  • Programmable Soft-Start
  • Automatic Frequency Synchronization
  • Small 16-Pin Thermally Enhanced TSSOP Package

Typical Application

LT3710 Typical Application


The LT3710 is a high efficiency step-down switching regulator intended for auxiliary outputs in single secondary winding, multiple output power supplies.

The LT3710 drives dual synchronous N-channel MOSFETs and achieves high efficiency. With leading edge modulation, it operates well with either primary side peak current or voltage mode control. It is synchronized to the falling edge of the transformer secondary winding and can be used in both single-ended and double-ended isolated power converter topologies. A high speed operational amplifier is incorporated to achieve optimum compensation and fast transient response. A user selectable discontinuous conduction mode improves light load efficiency.

The LT3710 is available in a thermally enhanced TSSOP-16 exposed pad power 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
LT3710EFE#PBF TSSOP-16 FE E 05-08-1663 (BA) Yes
LT3710EFE#TRPBF TSSOP-16 FE E 05-08-1663 (BA) Yes

LT3710 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
LT3710EFE#PBF TSSOP-16 E $5.63 $3.95 Yes
LT3710EFE#TRPBF TSSOP-16 E $4.07 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
DC448A LT3710EFE LT3781EG LTC1698EGN | Dual Output Isolated Power Supply, 36V to 72V Input, 3.3Vout @ 10A, 1.8/2.5Vout @ 10A Contact Factory
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Click here to view our complete list of demo boards


  • 48V Isolated DC/DC Converters
  • Multiple Output Supplies
  • Offline Converters

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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
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
  • And More!

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