LTC3901 - Secondary Side Synchronous Driver for Push-Pull and Full-Bridge Converters


  • N-Channel Synchronous MOSFET Driver
  • Programmable Timeout
  • Reverse Inductor Current Sense
  • Gate Drive Transformer Synchronization Sequence Monitor
  • Wide VCC Supply Range: 4.5V to 11V
  • 15ns Rise/Fall Times at VCC = 5V, CL = 4700pF
  • Undervoltage Lockout
  • Small 16-Lead SSOP Package

Typical Application

LTC3901 Typical Application


The LTC3901 is a secondary side synchronous rectifier driver designed to be used in isolated push-pull and full-bridge converter power supplies. The chip drives two external N-channel MOSFETs and accepts a transformer generated bipolar input to maintain synchronization with the primary side controller.

The LTC3901 provides a full range of protection features for the external MOSFETs. A programmable timeout function is included that disables both drivers when the synchronization signal is missing or incorrect. Additionally, the chip senses the output inductor current through the drain-source resistance of the two MOSFETs, turning off the MOSFETs if the inductor current reverses. The LTC3901 also shuts off the drivers if the supply is low or if the synchronization sequence is incorrect.


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
LTC3901EGN#PBF SSOP-16 GN E 05-08-1641 (GN16) Yes
LTC3901EGN#TRPBF SSOP-16 GN E 05-08-1641 (GN16) Yes

LTC3901 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
LTC3901EGN#PBF SSOP-16 E $3.75 $2.60 Yes
LTC3901EGN#TRPBF SSOP-16 E $2.66 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.

Click here to view our complete list of demo boards


  • 48V Input Isolated DC/DC Converters
  • Isolated Telecom Power Supplies
  • Distributed Power Step-Down Converters
  • Industrial Control System Power Supplies
  • Automotive and Heavy Equipment

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