Overview
Features and Benefits
- Supports Self-Starting Secondary-Side Control
- Direct Flux Limit™ Guarantees No Saturation
- Active Clamp Drive with Delay Adjustment
- On-Chip Bridge Rectifier Eliminates Need for Separate Gate Drive Bias Supply
- Wide Input Supply Range: 8V and Up (Limited Only by External Components)
- Linear Regulator Controller for Fast Start-Up
- High Speed Gate Drivers
- Precision UVLO with Adjustable Hysteresis
- Overcurrent Protection
- Overtemperature Protection
- Adjustable Start-Up Frequency and Soft-Start
- Tiny 16-Lead MSOP Package
Product Details
The LTC3765 is a start-up controller and gate driver for use in a self-starting secondary-side control forward converter. When combined with the LTC3766 secondary-side synchronous forward controller, a complete isolated power supply is created using a minimum of discrete parts. A proprietary scheme is used to multiplex gate drive signals and bias power across the isolation barrier through a small pulse transformer. The LTC3765 contains an onchip bridge rectifier that extracts gate drive bias power from this pulse transformer, eliminating the need for a separate bias supply. A precision undervoltage lockout circuit and linear regulator controller ensure a quick and well-controlled start-up.
The LTC3765 includes an active clamp output for driving an external PMOS, as well as an adjustable delay to optimize efficiency. The active clamp architecture reduces voltage stress on the main power switch, and provides the highest possible efficiency. Overcurrent protection and the Direct Flux Limit guarantee no transformer saturation without compromising transient response.
Applications
- Isolated Battery Chargers
- Isolated 48V Telecommunication Systems
- Servers and Embedded Computing
- Automotive and Heavy Equipment
Product Categories
Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (5)
Documentation & Resources
-
R419 Reliability Data3/22/2018
-
DC2199B-C - Demo Manual11/29/2016
-
DC2199A-B - Demo Manual6/2/2015
-
DC2199A-A - Demo Manual11/3/2014
-
DC1739B-C - Demo Manual8/15/2013
-
DC1739A-B - Demo Manual6/27/2012
-
Design a Simple, Efficient and Reliable Forward Converter10/15/2018
-
LTC3765/LTC3766 Video Product Brief10/15/2018
Tools & Simulations
LTspice
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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

LTspice Simulations
Models for the following parts are available in LTspice:
Product Recommendations
LTC3765 Companion Parts
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
---|---|---|---|---|
LTC3765EMSE#PBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
LTC3765EMSE#TRPBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
LTC3765HMSE#PBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
LTC3765HMSE#TRPBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
LTC3765IMSE#PBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
LTC3765IMSE#TRPBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
LTC3765MPMSE#PBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
LTC3765MPMSE#TRPBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
Wafer Fabrication Data | R419 Reliability Data |
PCN-PDN Information
Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.
Support & Discussions
LTC3765 Discussions
Sample & Buy
Ordering FAQs
See our Ordering FAQs for answers to questions about online orders, payment options and more.
Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
List Pricing
(*)The 1Ku 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 Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
Please see the latest communication from our CCO regarding lead times.
Sampling
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.
Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.