LTC3726 - Secondary-Side Synchronous Forward Controller


  • Secondary-Side Control for Fast Transient Response
  • Self-Starting Architecture Eliminates Need for Separate Bias Regulator
  • Proprietary Gate Drive Encoding Scheme Reduces System Complexity
  • Current Mode Control Ensures Current Sharing
  • PLL Fixed Frequency: 100kHz to 500kHz
  • ±1% Output Voltage Accuracy
  • OPTI-LOOP Compensation
  • Available in a Narrow 16-Lead SSOP Package

Typical Application

LTC3726 Typical Application


The LTC3726 is a secondary-side controller for synchronous forward converters. When used in conjunction with the LTC3705/LTC3725 gate driver and primary-side controllers, the part creates a complete isolated power supply that combines the simplicity of OPTI-LOOP® compensation with the speed of secondary-side control.

The LTC3726 has been designed to simplify the design of highly efficient, secondary-side forward converters. Working in concert with the LTC3705 or LTC 3725, the LTC3726 forms a robust, self-starting converter that eliminates the need for the separate bias regulator that is commonly used in secondary-side control applications. In addition, a proprietary scheme is used to multiplex gate drive signals and DC bias power across the isolation barrier through a single, tiny pulse transformer.

The LTC3726 is available in a 16-lead SSOP 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
LTC3726EGN#PBF SSOP-16 GN E 05-08-1641 (GN16) Yes
LTC3726EGN#TRPBF SSOP-16 GN E 05-08-1641 (GN16) Yes
LTC3726IGN#PBF SSOP-16 GN I 05-08-1641 (GN16) Yes
LTC3726IGN#TRPBF SSOP-16 GN I 05-08-1641 (GN16) Yes

LTC3726 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
LTC3726EGN#PBF SSOP-16 E $4.56 $3.19 Yes
LTC3726EGN#TRPBF SSOP-16 E $3.25 Yes
LTC3726IGN#PBF SSOP-16 I $5.04 $3.51 Yes
LTC3726IGN#TRPBF SSOP-16 I $3.57 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
DC1031A-A LTC3725EMSE/LTC3726EGN Demo Board | Single-Switch Forward Converter, 36V ≤ VIN ≤ 72V, Vout = 2.5V @ 20A $250.00
DC1031A-B LTC3725EMSE/LTC3726EGN Demo Board | Single-Switch Forward Converter, 36V ≤ VIN ≤ 72V, Vout = 3.3V @ 20A $250.00
DC1031A-C LTC3725EMSE/LTC3726EGN Demo Board | Single-Switch Forward Converter, 36V ≤ VIN ≤ 72V, Vout = 5V @ 20A $250.00
DC1032A LTC3725EMSE/LTC3726EGN 1/8 Brick | 36V < Vin < 72V, Vout: 12V/10A $250.00
DC1174A-A LTC3725EMSE/LTC3726EGN 1/8 Brick | 9V < Vin < 36V, Vout: 5.0V/10A $200.00
DC1174A-B LTC3725EMSE/LTC3726EGN 1/8 Brick | 9V < Vin < 36V, Vout: 12V/4A Contact Factory
DC1174A-C LTC3725EMSE/LTC3726EGN 1/8 Brick | 9V < Vin < 36V, Vout: 15V/3A $200.00
DC1300A-A LTC3725EMSE/LTC3726EGN 1/4 Brick | 9V < Vin < 36V, Vout: 5.0V/20A $200.00
DC1300A-B LTC3725EMSE/LTC3726EGN 1/4 Brick | 9V < Vin < 36V, Vout: 12V/8.4A $200.00
DC1300A-C LTC3725EMSE/LTC3726EGN 1/4 Brick | 9V < Vin < 36V, Vout: 15V/6.7A $200.00
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Click here to view our complete list of demo boards


  • Isolated 48V Telecommunication Systems
  • Internet Servers and Routers
  • Distributed Power Step-Down Converters
  • Automotive and Heavy Equipment

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