LT3574
PRODUCTIONIsolated Flyback Converter Without an Opto-Coupler
- Part Models
- 4
- 1ku List Price
- Starting From $4.21
Overview
- 3V to 40V Input Voltage Range
- 0.65A, 60V Integrated NPN Power Switch
- Boundary Mode Operation
- No Transformer Third Winding or Opto-Isolator Required for Regulation
- Improved Primary-Side Winding Feedback Load Regulation
- VOUT Set with Two External Resistors
- BIAS Pin for Internal Bias Supply and Power NPN Driver
- Programmable Soft-Start
- Programmable Power Switch Current Limit
- 16-Lead MSOP Package
The LT3574 is a monolithic switching regulator specifically designed for the isolated flyback topology. No third winding or opto-isolator is required for regulation. The part senses the isolated output voltage directly from the primary side flyback waveform. A 0.65A, 60V NPN power switch is integrated along with all control logic into a 16-lead MSOP package.
The LT3574 operates with input supply voltages from 3V to 40V, and can deliver output power up to 3W with no external power switch. The LT3574 utilizes boundary mode operation to provide a small magnetic solution with improved load regulation.
The output voltage is easily set with two external resistors and the transformer turns ratio. Off-the-shelf transformers are available for many applications.
Applications
- Industrial, Automotive and Medical Isolated Power Supplies
Documentation
Data Sheet 1
User Guide 1
Design Note 2
Technical Articles 1
Brochure 1
Product Selector Card 1
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 |
|---|---|---|---|
| LT3574EMS#PBF | 16-Lead MSOP | ||
| LT3574EMS#TRPBF | 16-Lead MSOP | ||
| LT3574IMS#PBF | 16-Lead MSOP | ||
| LT3574IMS#TRPBF | 16-Lead MSOP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package |
||
| LT3574EMS#PBF | PRODUCTION | |
| LT3574EMS#TRPBF | PRODUCTION | |
| LT3574IMS#PBF | PRODUCTION | |
| LT3574IMS#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LT3574EMS#PBF | PRODUCTION | |
| LT3574EMS#TRPBF | PRODUCTION | |
| LT3574IMS#PBF | PRODUCTION | |
| LT3574IMS#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Switching Regulators & Controllers 2 | ||
| LTM8048 | RECOMMENDED FOR NEW DESIGNS | 3.1VIN to 32VIN Isolated μModule (Power Module) DC/DC Converter with LDO Post Regulator |
| LTM8047 | RECOMMENDED FOR NEW DESIGNS | 3.1VIN to 32VIN Isolated μModule (Power Module) DC/DC Converter |
| Parts | Product Life Cycle | Description |
|---|---|---|
| LT8301 | RECOMMENDED FOR NEW DESIGNS | 42VIN Micropower No-Opto Isolated Flyback Converter with 65V/1.2A Switch |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3574
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
LT3574EMS Isolated Demo Board | 10V to 30VIN; VOUT = 5V @ 0.35A to 0.5A
Resources
Latest Discussions
No discussions on LT3574 yet. Have something to say?
Start a Discussion on EngineerZone®