LTC3766

RECOMMENDED FOR NEW DESIGNS

High Efficiency, Secondary-Side Synchronous Forward Controller

Part Models: 16
1ku List Price: Starting From $4.63

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Overview

Direct Flux Limit^™ Guarantees No Saturation
Fast and Accurate Average Current Limit
Clean Start-Up Into Pre-Biased Output
Secondary-Side Control for Fast Transient Response
Simple, Self-Starting Architecture
Synchronous MOSFET Reverse Current Limit
PolyPhase^® Operation Eases High-Power Design
True Remote Sense Differential Amplifier
Remote Sense Reverse Protection
High Voltage Linear Regulator Controller
Internal LDO Powers Gate Drive from V_OUT
Overtemperature/Overvoltage Protection
Low Profile 4mm × 5mm QFN and Narrow 28-Lead SSOP Packages

The LTC3766 is a PolyPhase-capable secondary-side controller for synchronous forward converters. When used in conjunction with the LTC3765 active-clamp forward controller and gate driver, the part creates a complete isolated power supply that combines the power of multiphase operation with the speed of secondary-side control.

The LTC3766 has been designed to simplify the design of active clamp forward converters. Working in concert with the LTC3765, the LTC3766 forms a robust, self-starting converter that eliminates the need for the separate bias regulator that is commonly used in secondary-side control applications. A precision current-limit coupled with clean start-up into a pre-biased load make the LTC3766 an excellent choice for high-power battery charger applications.

The LTC3766 provides extensive remote sensing and output protection features, while Direct Flux Limit guarantees no transformer saturation without compromising transient response. A linear regulator controller and internal bypass LDO are also provided to simplify the generation of the secondary-side bias voltage.

Applications

Isolated 48V Telecommunication Systems
Isolated Battery Chargers
Automotive and Military Systems
Industrial, Avionics and Heavy Equipment

Part Models: 16
1ku List Price: Starting From $4.63

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3766EGN#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3766EGN#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3766EUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3766EUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3766HGN#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3766HGN#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3766HUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3766HUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3766IGN#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3766IGN#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3766IUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3766IUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3766MPGN#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3766MPGN#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3766MPUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3766MPUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Aug 10, 2022 - 22_0177 Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL
		PCN22_0177_Form Material_Report Delta Qualification Matrix
LTC3766EGN#PBF	PRODUCTION
LTC3766EGN#TRPBF	PRODUCTION
LTC3766HGN#PBF	PRODUCTION
LTC3766HGN#TRPBF	PRODUCTION
LTC3766IGN#PBF	PRODUCTION
LTC3766IGN#TRPBF	PRODUCTION
LTC3766MPGN#PBF	PRODUCTION
LTC3766MPGN#TRPBF	PRODUCTION
Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LTC3766EUFD#PBF	PRODUCTION
LTC3766EUFD#TRPBF	PRODUCTION
Apr 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LTC3766HUFD#PBF	PRODUCTION
LTC3766HUFD#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Digital to Analog Converters (DACs) 1
LTC2654	PRODUCTION	Quad 16-/12-Bit Rail-to-Rail DACs with 10ppm/°C Max Reference
Switching Regulators & Controllers 1
LTC3765	RECOMMENDED FOR NEW DESIGNS	Active Clamp Forward Controller and Gate Driver
Temperature Sensors 2
LTC2997	PRODUCTION	Remote/Internal Temperature Sensor
LTC2991	RECOMMENDED FOR NEW DESIGNS	Octal I²C Voltage, Current, and Temperature Monitor

Tools & Simulations

LTspice 5

Models for the following parts are available in LTspice:

LTC3766

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

LTC3765EMSE/LTC3766EGN Isolated Demo Board | Forward Converter with Sync Rectification, 36V ≤ VIN ≤ 60V; VOUT = 56V @ 5.4A

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Product Details

Demonstration circuit 2199B-C is a 300W isolated forward converter with synchronous rectification featuring the LTC3765/LTC3766 chip-set. It produces a regulated 56V, 5.4A output from an input voltage range of 36V to 60V.

Resources

DC2199B-C - Demo Manual
11/29/2016

DC2199B-C - Design Files
11/29/2016

DC2199B-C - Schematic
11/29/2016

LTC3765EMSE/LTC3766EGN Isolated Demo Board | Forward Converter with Sync Rectification, 36V ≤ VIN ≤ 60V; VOUT = 24V @ 15A

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Product Details

Demonstration circuit 2199A-B is a 360W isolated forward converter with synchronous rectification featuring the LTC3765/LTC3766 chip-set. It produces a regulated 24V, 15A output from an input voltage range of 36V to 60V.

Resources

DC2199A-B - Demo Manual
6/2/2015

DC2199A-B - Design Files
6/2/2015

DC2199A-B - Schematic
6/2/2015

LTC3765EMSE/LTC3766EGN Isolated Demo Board | Forward Converter, 9V ≤ VIN ≤ 36V; VOUT = 12V @ 10A

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Product Details

Demonstration circuit 1739B-C is a 120W isolated forward converter with synchronous rectification featuring the LTC3765/LTC3766 chip set. This circuit demonstrates the high level of performance, efficiency, and small solution size attainable using this chipset in an active-clamp-reset forward converter power supply. It operates at 240kHz and produces a regulated 12V/10A output from an input voltage range of 9V to 36V. It has an eighth-brick footprint area.

Resources

DC1739B-C - Demo Manual
8/15/2013

DC1739B-C - Design Files
10/9/2013

DC1739B-C - Schematic
10/9/2013

LTC3765EMSE/LTC3766EGN Isolated Demo Board | Forward Converter, 36V ≤ VIN ≤ 60V; VOUT = 12V @ 30A

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Product Details

Demonstration circuit 2199A-A is a 360W isolated forward converter with synchronous rectification featuring the LTC3765/LTC3766. It produces a regulated 12V, 30A output from an input voltage range of 36V to 60V.

Resources

DC2199A-A - Design Files
10/24/2014

DC2199A-A - Demo Manual
11/3/2014

DC2199A - Schematic
11/3/2014

LTC3765EMSE/LTC3766EGN Isolated Demo Board | Forward Converter, 18V ≤ VIN ≤ 72V; VOUT = 12V @ 12.5A

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Product Details

Demonstration circuit 1739A-B is a 150W isolated forward converter with synchronous rectification featuring the LTC3765/LTC3766. This circuit demonstrates a high level of performance, efficiency, and small solution size attainable using these parts in an active-clamp-reset forward converter power supply. It operates at 240kHz and produces a regulated 12V, 12.5A output from an input voltage range of 18V to 72V, making it well suited for telecom, industrial, and other applications.

Resources

DC1739A-B - Demo Manual
6/27/2012

DC1739A-B - Schematic
6/27/2012

DC1739A-B - Design Files
6/27/2012

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LTC3766

Overview

Documentation

Data Sheet 1

Reliability Data 1

User Guide 5

Video 2

Product Selector Card 1

Software Resources

Can't find the software or driver you need?

Hardware Ecosystem

Tools & Simulations

LTspice 5

Models for the following parts are available in LTspice:

Evaluation Kits

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