LT3575
PRODUCTIONIsolated Flyback Converter without an Opto-Coupler
- Part Models
- 4
- 1ku List Price
- Starting From $4.50
Overview
- 3V to 40V Input Voltage Range
- 2.5A, 60V Integrated NPN Power Switch
- Boundary Mode Operation
- No Transformer Third Winding or Optoisolator 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
- Thermally Enhanced 16-Lead TSSOP
The LT3575 is a monolithic switching regulator specifically designed for the isolated flyback topology. No third winding or optoisolator is required for regulation. The part senses the isolated output voltage directly from the primary side flyback waveform. A 2.5A, 60V NPN power switch is integrated along with all control logic into a 16-lead TSSOP package.
The LT3575 operates with input supply voltages from 3V to 40V, and can deliver output power up to 14W with no external power switch.The LT3575 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 |
|---|---|---|---|
| LT3575EFE#PBF | 16-Lead TSSOP w/ EP | ||
| LT3575EFE#TRPBF | 16-Lead TSSOP w/ EP | ||
| LT3575IFE#PBF | 16-Lead TSSOP w/ EP | ||
| LT3575IFE#TRPBF | 16-Lead TSSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
May 18, 2026 - 26_0072 Epoxy Change for Select TSSOP Products |
||
| LT3575EFE#PBF | PRODUCTION | |
| LT3575EFE#TRPBF | PRODUCTION | |
| LT3575IFE#PBF | PRODUCTION | |
| LT3575IFE#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LT3575EFE#PBF | PRODUCTION | |
| LT3575EFE#TRPBF | PRODUCTION | |
| LT3575IFE#PBF | PRODUCTION | |
| LT3575IFE#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 |
|---|---|---|
| Hot Swap Controllers 1 | ||
| LTC4364 | RECOMMENDED FOR NEW DESIGNS | Surge Stopper with Ideal Diode |
| 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 |
|---|---|---|
| LT8302/LT8302-3 | 42VIN Micropower No-Opto Isolated Flyback Converter with 65V/3.6A Switch |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3575
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
LT3575EFE Demo Board | 10V to 28VIN, VOUT = 5V @ Up to 2A