LT1245

PRODUCTION

LT1245

High Speed Current Mode Pulse Width Modulators

PRODUCTION

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Part Models 6

1ku List Price Starting From $2.61

Features

Low Start-Up Current: <250µA
50ns Current Sense Delay
Current Mode Operation: To 500kHz
Pin Compatible with UC1842 Series
Undervoltage Lockout with Hysteresis
No Cross-Conduction Current
Trimmed Bandgap Reference
1A Totem Pole Output
Trimmed Oscillator Frequency and Sink Current
Active Pull-Down on Reference and Output During Undervoltage Lockout
High Level Output Clamp: 18V
Current Sense Leading Edge Blanking

Additional Details

The LT1241 series devices are 8-pin, fixed frequency, current mode, pulse width modulators. They are improved plug compatible versions of the industry standard UC1842 series. These devices have both improved speed and lower quiescent current. The LT1241 series is optimized for off-line and DC/DC converter applications. They contain a temperature-compensated reference, high gain error amplifier, current sensing comparator and a high current totem pole output stage ideally suited to driving power MOSFETs. Start-up current has been reduced to less than 250µA. Cross-conduction current spikes in the output stage have been eliminated, making 500kHz operation practical. Several new features have been incorporated. Leading edge blanking has been added to the current sense comparator. Trims have been added to the oscillator circuit for both frequency and sink current, and both of these parameters are tightly specified. The output stage is clamped to a maximum V_OUTof 18V in the on state. The output and the reference output are actively pulled low during undervoltage lockout.

Applications

Off-Line Converters
DC/DC Converters

Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 6

1ku List Price Starting From $2.61

Documentation

Featured Documents 1

PDF

UPDATED Aug 22, 2007. English

LT1241 Series: High Speed Current Mode Pulse Width Modulators Data Sheet (Rev.B)

1.18 M

Design Resources 6

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
LT1245CN8#PBF	8-Lead PDIP (Narrow 0.3 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT1245CS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT1245CS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT1245IN8#PBF	8-Lead PDIP (Narrow 0.3 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT1245IS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT1245IS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LT1245CN8#PBF
Pin/Package Drawing
8-Lead PDIP (Narrow 0.3 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT1245CS8#PBF
Pin/Package Drawing
8-Lead SOIC (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT1245CS8#TRPBF
Pin/Package Drawing
8-Lead SOIC (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT1245IN8#PBF
Pin/Package Drawing
8-Lead PDIP (Narrow 0.3 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT1245IS8#PBF
Pin/Package Drawing
8-Lead SOIC (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT1245IS8#TRPBF
Pin/Package Drawing
8-Lead SOIC (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

PCN/PDN Information

Filter by Model

Part Models

Product Lifecycle

PCN

Oct 11, 2022

- 22_0241

Epoxy Change from Henkel 8290 to 8290A for PDIP Package

LT1245CN8#PBF

PRODUCTION

LT1245IN8#PBF

PRODUCTION

pdf

PCN22_0241_Form

xls

Material_Report

pdf

Qualification Results Summary

Aug 6, 2022

- 22_0172

Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG]

LT1245CN8#PBF

PRODUCTION

LT1245IN8#PBF

PRODUCTION

pdf

PCN22_0172_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Dec 14, 2023

- 22_0255

Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)

LT1245CS8#PBF

PRODUCTION

LT1245CS8#TRPBF

PRODUCTION

LT1245IS8#PBF

PRODUCTION

LT1245IS8#TRPBF

PRODUCTION

pdf

PCN22_0255_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Jun 11, 2021

- 21_0060

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

LT1245CS8#PBF

PRODUCTION

LT1245CS8#TRPBF

PRODUCTION

LT1245IS8#PBF

PRODUCTION

LT1245IS8#TRPBF

PRODUCTION

pdf

PCN21_0060_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Filter by Model

Part Models

Product Lifecycle

PCN

Oct 11, 2022

- 22_0241

Epoxy Change from Henkel 8290 to 8290A for PDIP Package

LT1245CN8#PBF

PRODUCTION

LT1245IN8#PBF

PRODUCTION

pdf

PCN22_0241_Form

xls

Material_Report

pdf

Qualification Results Summary

Aug 6, 2022

- 22_0172

Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG]

LT1245CN8#PBF

PRODUCTION

LT1245IN8#PBF

PRODUCTION

pdf

PCN22_0172_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Dec 14, 2023

- 22_0255

Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)

LT1245CS8#PBF

PRODUCTION

LT1245CS8#TRPBF

PRODUCTION

LT1245IS8#PBF

PRODUCTION

LT1245IS8#TRPBF

PRODUCTION

pdf

PCN22_0255_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Jun 11, 2021

- 21_0060

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

LT1245CS8#PBF

PRODUCTION

LT1245CS8#TRPBF

PRODUCTION

LT1245IS8#PBF

PRODUCTION

LT1245IS8#TRPBF

PRODUCTION

pdf

PCN21_0060_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Software & Part Ecosystem

Tools & Simulations

Tools & Simulations 1

LTspice 1

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.