LT1105
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LT1105

Offline Switching Regulator

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Models 4
1ku List Price Starting From $5.08
Features
  • ±1% Line and Load Regulation with No Optocoupler
  • Switch Frequency Up to 200kHz
  • Internal 1A Totem-Pole Driver (LT1105)
  • Start-Up Mode Draws Only 200µA
  • Fully Protected Against Overloads
  • Overvoltage Lockout of Main Supply
  • Protected Against Underdrive or Overdrive to FET
  • Operates in Continuous or Discontinuous Mode
  • Ideal for Flyback and Forward Topologies
  • Isolated Flyback Mode Has Fully Floating Outputs
Additional Details
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The LT1105 Offline Switching Regulator is designed for high input voltage applications using an external FET switch. The LT1105 is available and its totem pole output drives the gate of an external FET. Unique design of the LT1105 eliminates the need for an optocoupler while still providing ±1% load and line regulation in a magnetic flux-sensed converter. This significantly simplifies the design of offline power supplies and reduces the number of components which must cross the isolation barrier to one, the transformer.

The LT1105 current mode switching techniques are well suited to transformer isolated flyback and forward topologies while providing ease of frequency compensation with a minimum of external components.

APPLICATIONS

  • Up to 250W Isolated Mains Converter
  • Up to 50W Isolated Telecom Converter
  • Fully Isolated Multiple Outputs
  • Distributed Power Conversion Networks
Part Models 4
1ku List Price Starting From $5.08

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Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT1105CN#PBF
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LT1105CN8#PBF
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LT1105IN#PBF
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LT1105IN8#PBF
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Product Lifecycle

PCN

Oct 11, 2022

- 22_0241

Epoxy Change from Henkel 8290 to 8290A for PDIP Package

LT1105CN#PBF

PRODUCTION

LT1105CN8#PBF

PRODUCTION

LT1105IN#PBF

PRODUCTION

Aug 6, 2022

- 22_0172

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

LT1105CN#PBF

PRODUCTION

LT1105CN8#PBF

PRODUCTION

LT1105IN#PBF

PRODUCTION

Oct 8, 2024

- 24_0234

Migrating Bottom Trace Code Marking to Top Side Laser Marking for PDIP Package

LT1105CN8#PBF

PRODUCTION

LT1105IN8#PBF

PRODUCTION

Dec 18, 2023

- 22_0241

Epoxy Change from Henkel 8290 to 8290A for PDIP Package

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Oct 11, 2022

- 22_0241

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Epoxy Change from Henkel 8290 to 8290A for PDIP Package

LT1105CN#PBF

PRODUCTION

LT1105CN8#PBF

PRODUCTION

LT1105IN#PBF

PRODUCTION

Aug 6, 2022

- 22_0172

arrow down

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

LT1105CN#PBF

PRODUCTION

LT1105CN8#PBF

PRODUCTION

LT1105IN#PBF

PRODUCTION

Oct 8, 2024

- 24_0234

arrow down

Migrating Bottom Trace Code Marking to Top Side Laser Marking for PDIP Package

LT1105CN8#PBF

PRODUCTION

LT1105IN8#PBF

PRODUCTION

Dec 18, 2023

- 22_0241

arrow down

Epoxy Change from Henkel 8290 to 8290A for PDIP Package

Software & Part Ecosystem

Tools & Simulations 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.

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