LT1425
PRODUCTIONIsolated Flyback Switching Regulators
- Part Models
- 4
- 1ku List Price
- Starting From $5.31
Overview
- No Transformer "Third Winding" or Optoisolator Required
- ±5% Accurate Output Voltage Without User Trims
- Resistor Programmable Output Voltage
- Regulation Maintained Well Into Discontinuous Mode (Light Load)
- Optional Load Compensation
- Operating Frequency: 285kHz
- Easily Synchronized to External Clock
- Available in 16-Pin Narrow SO Package
The LT1425 is a monolithic high power switching regulator specifically designed for the isolated flyback topology. No “third winding” or optoisolator is required; the integrated circuit senses the isolated output voltage directly from the primary side flyback waveform. A high current, high efficiency switch is included on the die along with all oscillator, control and protection circuitry.
The LT1425 operates with input supply voltages from 3V to 20V and draws only 7mA quiescent current. It can deliver output power up to 6W with no external power devices. By utilizing current mode switching techniques, it provides excellent AC and DC line regulation.
The LT1425 has a number of features not found on other switching regulator ICs. Its unique control circuitry can maintain regulation well into discontinuous mode in most applications. Optional load compensation circuitry allows for improved load regulation. An externally activated shutdown mode reduces total supply current to 15µA for standby operation.
Applications
- Isolated Flyback Switching Regulators
- Ethernet Isolated 5V to -9V Converter
- Medical Instruments
- Isolated Telecom Supplies
Documentation
Data Sheet 1
Application Note 1
Design Note 1
Technical Articles 1
Spec Notice 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 |
|---|---|---|---|
| LT1425CS#PBF | 16-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1425CS#TRPBF | 16-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1425IS#PBF | 16-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1425IS#TRPBF | 16-Lead SOIC (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 8, 2024 - 24_0236 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package |
||
| LT1425CS#PBF | PRODUCTION | |
| LT1425CS#TRPBF | PRODUCTION | |
| LT1425IS#PBF | PRODUCTION | |
| LT1425IS#TRPBF | PRODUCTION | |
|
Oct 12, 2022 - 22_0252 Epoxy Change from Henkel 8290 to 8290A for 16-Lead SOIC Package |
||
| LT1425CS#PBF | PRODUCTION | |
| LT1425CS#TRPBF | PRODUCTION | |
| LT1425IS#PBF | PRODUCTION | |
| LT1425IS#TRPBF | PRODUCTION | |
|
Aug 6, 2022 - 22_0173 Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG] |
||
| LT1425CS#PBF | PRODUCTION | |
| LT1425CS#TRPBF | PRODUCTION | |
| LT1425IS#PBF | PRODUCTION | |
| LT1425IS#TRPBF | PRODUCTION | |
|
Apr 28, 2020 - 20_0187 LT1425 Datasheet Electrical Specification Change |
||
| LT1425CS#PBF | PRODUCTION | |
| LT1425CS#TRPBF | PRODUCTION | |
| LT1425IS#PBF | PRODUCTION | |
| LT1425IS#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 |
|---|---|---|
| Oscillators 1 | ||
| LTC6908 | Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation | |
| Switching Regulators & Controllers 2 | ||
| LTM8047 | RECOMMENDED FOR NEW DESIGNS | 3.1VIN to 32VIN Isolated μModule (Power Module) DC/DC Converter |
| LTM8048 | RECOMMENDED FOR NEW DESIGNS | 3.1VIN to 32VIN Isolated μModule (Power Module) DC/DC Converter with LDO Post Regulator |
| Parts | Product Life Cycle | Description |
|---|---|---|
| LT3573 | PRODUCTION | Isolated Flyback Converter without an Opto-Coupler |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LT1425
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.
