LTC3726 - Secondary-Side Synchronous Forward Controller

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.

Features
  • 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
Applications
  • Isolated 48V Telecommunication Systems
  • Internet Servers and Routers
  • Distributed Power Step-Down Converters
  • Automotive and Heavy Equipment
Packaging
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC3726EGN#PBFSSOP-16E$4.56$3.19
LTC3726EGN#TRPBFSSOP-16E$3.25
LTC3726IGN#PBFSSOP-16I$5.04$3.51
LTC3726IGN#TRPBFSSOP-16I$3.57
Demo Boards
Part NumberDescriptionPrice
DC1031A-ALTC3725EMSE/LTC3726EGN Demo Board | Single-Switch Forward Converter, 36V ≤ VIN ≤ 72V, Vout = 2.5V @ 20A$250.00
DC1031A-BLTC3725EMSE/LTC3726EGN Demo Board | Single-Switch Forward Converter, 36V ≤ VIN ≤ 72V, Vout = 3.3V @ 20A$250.00
DC1031A-CLTC3725EMSE/LTC3726EGN Demo Board | Single-Switch Forward Converter, 36V ≤ VIN ≤ 72V, Vout = 5V @ 20A$250.00
DC1032ALTC3725EMSE/LTC3726EGN 1/8 Brick | 36V < Vin < 72V, Vout: 12V/10A$250.00
DC1174A-ALTC3725EMSE/LTC3726EGN 1/8 Brick | 9V < Vin < 36V, Vout: 5.0V/10A$200.00
DC1174A-BLTC3725EMSE/LTC3726EGN 1/8 Brick | 9V < Vin < 36V, Vout: 12V/4A$200.00
DC1174A-CLTC3725EMSE/LTC3726EGN 1/8 Brick | 9V < Vin < 36V, Vout: 15V/3A$200.00
DC1300A-ALTC3725EMSE/LTC3726EGN 1/4 Brick | 9V < Vin < 36V, Vout: 5.0V/20A$200.00
DC1300A-BLTC3725EMSE/LTC3726EGN 1/4 Brick | 9V < Vin < 36V, Vout: 12V/8.4A$200.00
DC1300A-CLTC3725EMSE/LTC3726EGN 1/4 Brick | 9V < Vin < 36V, Vout: 15V/6.7A$200.00
Datasheet
Design Note
Reliability Data
LT Journal
Press Release
Related Product
LTC3726 - Secondary-Side Synchronous Forward Controller
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LTC3726 Footprints and Symbols