LT8310 - 100VIN Forward Converter Controller


  • Input Voltage Range: 6V to 100V
  • Duty Mode Control Regulates an Isolated Output without an Opto
  • High Efficiency Synchronous Control
  • Short-Circuit (Hiccup Mode) Overcurrent Protection
  • Programmable OVLO and UVLO with Hysteresis
  • Programmable Frequency (100kHz to 500kHz)
  • Synchronizable to an External Clock
  • Positive or Negative Polarity Output Voltage Feedback with a Single FBX Pin
  • Programmable Soft-Start
  • Low Shutdown Current < 1μA
  • Available in FE20 TSSOP with HV Pin Spacing

Typical Application

LT8310 Typical Application
LT8310 Typical Application


The LT®8310 is a simple-to-use resonant reset forward converter controller that drives the gate of a low side N-channel MOSFET from an internally regulated 10V supply. The LT8310 features duty mode control that generates a stable, regulated, isolated output using a single power transformer. With the addition of output voltage feedback, via opto-coupler (isolated) or directly wired (nonisolated), current mode regulation is activated, improving output accuracy and load response. The flexibility to choose transformer turns ratio makes high step-down or step-up ratios possible without operating at duty cycle extremes.

The user can program the switching frequency from 100kHz to 500kHz to optimize efficiency, performance or external component size. A synchronous output is available for controlling secondary side synchronous rectification to improve efficiency. User programmable protection features include monitors on input voltage (UVLO and OVLO) and switch current (overcurrent limit). The LT8310 soft-start feature helps protect the transformer from flux saturation.


For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LT8310EFE#PBF TSSOP-20 FE E 05-08-1924 RoHS
LT8310EFE#TRPBF TSSOP-20 FE E 05-08-1924 RoHS
LT8310HFE#PBF TSSOP-20 FE H 05-08-1924 RoHS
LT8310HFE#TRPBF TSSOP-20 FE H 05-08-1924 RoHS
LT8310IFE#PBF TSSOP-20 FE I 05-08-1924 RoHS
LT8310IFE#TRPBF TSSOP-20 FE I 05-08-1924 RoHS
LT8310MPFE#PBF TSSOP-20 FE MP 05-08-1924 RoHS
LT8310MPFE#TRPBF TSSOP-20 FE MP 05-08-1924 RoHS

LT8310 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Temp Price
LT8310EFE#PBF TSSOP-20 E $3.94 $2.99 View
LT8310EFE#TRPBF TSSOP-20 E $3.05 View
LT8310HFE#PBF TSSOP-20 H $4.79 $3.60 View
LT8310HFE#TRPBF TSSOP-20 H $3.66 View
LT8310IFE#PBF TSSOP-20 I $4.37 $3.31 View
LT8310IFE#TRPBF TSSOP-20 I $3.37 View
LT8310MPFE#PBF TSSOP-20 MP $13.11 $9.60 View
LT8310MPFE#TRPBF TSSOP-20 MP $9.66 View
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
DC1963A LT8310EFE Demo Board | Isolated Forward Converter, 36V ≤ VIN ≤ 72V; VOUT = 12V @ 6A Contact Factory
DC2015A LT8310EFE/LT8311EFE Isolated Demo Board | 36V ≤ VIN ≤ 72V; VOUT = 12V @ 12A Contact Factory
Buy Now
Click here to view our complete list of demo boards


  • Industrial, Automotive and Military Systems
  • 48V Telecommunication Isolated Power Supplies
  • Isolated and Nonisolated DC/DC Converters

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email with questions and comments.

Design Tools


LTspice® IV 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 IV

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

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

Models for the following parts are available in LTspice IV:

Technical Support