LT1425

PRODUCTION

Isolated Flyback Switching Regulators

Data Sheet (Rev. B) Product Selection Table

Part Models: 4
1ku List Price: Starting From $4.19

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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

Part Models: 4
1ku List Price: Starting From $4.19

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
LT1425CS#PBF	16-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1425CS#TRPBF	16-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1425IS#PBF	16-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1425IS#TRPBF	16-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 8, 2024 - 24_0236 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package
		PCN24_0236_Form Material_Report Marking Comparison Delta Qualification Matrix
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
		PCN22_0252_Form Material_Report Qualification Results Summary
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]
		PCN22_0173_Form Material_Report Delta Qualification Matrix
LT1425CS#PBF	PRODUCTION
LT1425CS#TRPBF	PRODUCTION
LT1425IS#PBF	PRODUCTION
LT1425IS#TRPBF	PRODUCTION
Apr 28, 2020 - 20_0187 LT1425 Datasheet Electrical Specification Change
		PCN20_0187_Form Material_Report Datasheet Specification Comparison
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

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Hardware 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	3.1V_IN to 32V_IN Isolated μModule (Power Module) DC/DC Converter
LTM8048	RECOMMENDED FOR NEW DESIGNS	3.1V_IN to 32V_IN 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.