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.


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
LT8310EFE#PBF TSSOP-20 FE E 05-08-1924 Yes
LT8310EFE#TRPBF TSSOP-20 FE E 05-08-1924 Yes
LT8310HFE#PBF TSSOP-20 FE H 05-08-1924 Yes
LT8310HFE#TRPBF TSSOP-20 FE H 05-08-1924 Yes
LT8310IFE#PBF TSSOP-20 FE I 05-08-1924 Yes
LT8310IFE#TRPBF TSSOP-20 FE I 05-08-1924 Yes
LT8310MPFE#PBF TSSOP-20 FE MP 05-08-1924 Yes
LT8310MPFE#TRPBF TSSOP-20 FE MP 05-08-1924 Yes

LT8310 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
LT8310EFE#PBF TSSOP-20 E $3.94 $2.99 Yes
LT8310EFE#TRPBF TSSOP-20 E $3.05 Yes
LT8310HFE#PBF TSSOP-20 H $4.79 $3.60 Yes
LT8310HFE#TRPBF TSSOP-20 H $3.66 Yes
LT8310IFE#PBF TSSOP-20 I $4.37 $3.31 Yes
LT8310IFE#TRPBF TSSOP-20 I $3.37 Yes
LT8310MPFE#PBF TSSOP-20 MP $13.11 $9.60 Yes
LT8310MPFE#TRPBF TSSOP-20 MP $9.66 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
DC1963A LT8310EFE Demo Board | Isolated Forward Converter, 36V ≤ VIN ≤ 72V; VOUT = 12V @ 6A $250.00
DC2015A LT8310EFE/LT8311EFE Isolated Demo Board | 36V ≤ VIN ≤ 72V; VOUT = 12V @ 12A $300.00
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  • Industrial, Automotive and Military Systems
  • 48V Telecommunication Isolated Power Supplies
  • Isolated and Nonisolated DC/DC Converters

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