LT3845A
Info : RECOMMENDED FOR NEW DESIGNS
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LT3845A

High Voltage Synchronous Current Mode Step-Down Controller with Adjustable Operating Frequency

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 6
1ku List Price Starting From $4.26
Features
  • High Voltage Operation: Up to 60V
  • Synchronizable Up to 600kHz
  • Adjustable Constant Frequency: 100kHz to 500kHz
  • Output Voltages Up to 36V
  • Stable Operation in Current Limit
  • Adaptive Nonoverlap Circuitry Prevents Switch Shoot-Through
  • Reverse Inductor Current Inhibit for Discontinuous Operation Improves Efficiency with Light Loads
  • Programmable Soft-Start
  • 120μA No Load Quiescent Current
  • 10μA Shutdown Supply Current
  • 1% Regulation Accuracy
  • Standard Gate N-Channel Power MOSFETs
  • Reverse Overcurrent Protection
  • 16-Lead Thermally Enhanced TSSOP Package
Additional Details
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The LT3845A is a high voltage, synchronous, current mode controller used for medium to high power, high efficiency supplies. It offers a wide 4V to 60V input range (7.5V minimum start-up voltage). An onboard regulator simplifies the biasing requirements by providing IC power directly from VIN.

Burst Mode® operation maintains high efficiency at light loads by reducing IC quiescent current to 120μA. Light load efficiency is also improved with the reverse inductor current inhibit function which supports discontinuous operation.

Additional features include adjustable fixed operating frequency that can be synchronized to an external clock for noise sensitive applications, gate drivers capable of driving large N-channel MOSFETs, a precision undervoltage lockout, 10μA shutdown current, short-circuit protection and a programmable soft-start.

The LT3845A is available in a 16-lead thermally enhanced TSSOP package.

  Features
LT3845 -
LT3845A Improved Performance In Over Current Conditions

Applications

  • 12V and 42V Automotive and Heavy Equipment
  • 48V Telecom Power Supplies
  • Avionics and Industrial Control Systems
  • Distributed Power Converters
Part Models 6
1ku List Price Starting From $4.26

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT3845AEFE#PBF

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Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT3845AEFE#PBF

PRODUCTION

LT3845AEFE#TRPBF

PRODUCTION

LT3845AIFE#PBF

PRODUCTION

LT3845AIFE#TRPBF

PRODUCTION

LT3845AMPFE#PBF

PRODUCTION

LT3845AMPFE#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC1619A

LT3845AEFE Demo Board | 16V ≤ VIN ≤ 60V, VOUT = 12V @ 10A

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DC1619A

LT3845AEFE Demo Board | 16V ≤ VIN ≤ 60V, VOUT = 12V @ 10A

LT3845AEFE Demo Board | 16V ≤ VIN ≤ 60V, VOUT = 12V @ 10A

Product Detail

Demonstration Circuit 1619A is a 100kHz to 500kHz programmable frequency, high voltage, current mode DC/DC step-down converter featuring the LT3845A. The operating frequency can be synchronized up to 600kHz. This demo board is designed for 12V output at up to 10A (120W) from a 16V to 60V input.

Tools & Simulations

Tools & Simulations 2

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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