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  2. Power Management
  3. Switching Regulators
  4. Flyback, Forward, and Isolated Controller
  5. LT3757


Alternative Parts

Overview

Features and Benefits

  • Wide Input Voltage Range: 2.9V to 40V
  • Positive or Negative Output Voltage Programming with a Single Feedback Pin
  • Current Mode Control Provides Excellent Transient Response
  • Programmable Operating Frequency (100kHz to 1MHz) with One External Resistor
  • Synchronizable to an External Clock
  • Low Shutdown Current < 1µA
  • Internal 7.2V Low Dropout Voltage Regulator
  • Programmable Input Undervoltage Lockout with Hysteresis
  • Programmable Soft-Start
  • Small 10-Lead DFN (3mm × 3mm) and Thermally Enhanced 10-Pin MSOP Packages
  • AEC-Q100 Qualified for Automotive Applications

Product Details

The LT3757/LT3757A are wide input range, current mode, DC/DC controllers which are capable of generating either positive or negative output voltages. They can be configured as either a boost, flyback, SEPIC or inverting converter. The LT3757/LT3757A drive a low side external N-channel power MOSFET from an internal regulated 7.2V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages.

The operating frequency of LT3757/LT3757A can be set with an external resistor over a 100kHz to 1MHz range, and can be synchronized to an external clock using the SYNC pin. A low minimum operating supply voltage of 2.9V, and a low shutdown quiescent current of less than 1µA, make the LT3757/LT3757A ideally suited for battery-operated systems.

The LT3757/LT3757A feature soft-start and frequency foldback functions to limit inductor current during startup and output short-circuit. The LT3757A has improved load transient performance compared to the LT3757.

APPLICATIONS

  • Automotive and Industrial Boost, Flyback, SEPIC and Inverting Converters
  • Telecom Power Supplies
  • Portable Electronic Equipment

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (4)

Tools & Simulations

LTspice

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.

LTspice

Models for the following parts are available in LTspice:

LT3757
LT3757A

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

To open the project file for this circuit:

Step 1: Download and install LTpowerCAD on your computer.

Step 2: Click on the link(s) in the section below to download part-specific project files.

Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.

LTPowerCAD

Design tools for the following parts are available in LTpowerCAD:

LT3757(SEPIC

Product Recommendations

LT3757 Companion Parts

Recommended Related Parts

Design Resources

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 Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LT3757AEDD#PBF Material Declaration Reliability Data 10-Lead DFN (3mm x 3mm w/ EP)
LT3757AEDD#TRPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 3mm w/ EP)
LT3757AEMSE#PBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757AEMSE#TRPBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757AEMSE#WPBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757AEMSE#WTRPBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757AHMSE#PBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757AHMSE#TRPBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757AHMSE#WPBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757AHMSE#WTRPBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757AIDD#PBF Material Declaration Reliability Data 10-Lead DFN (3mm x 3mm w/ EP)
LT3757AIDD#TRPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 3mm w/ EP)
LT3757AIMSE#PBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757AIMSE#TRPBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757AIMSE#WPBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757AIMSE#WTRPBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757AMPMSE#PBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757AMPMSE#TRPBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757EDD#PBF Material Declaration Reliability Data 10-Lead DFN (3mm x 3mm w/ EP)
LT3757EDD#TRPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 3mm w/ EP)
LT3757EMSE#PBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757EMSE#TRPBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757HMSE#PBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757HMSE#TRPBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757IDD#PBF Material Declaration Reliability Data 10-Lead DFN (3mm x 3mm w/ EP)
LT3757IDD#TRPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 3mm w/ EP)
LT3757IMSE#PBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757IMSE#TRPBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757MPMSE#PBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LT3757MPMSE#TRPBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
Wafer Fabrication Data R530 Reliability Data

PCN-PDN Information

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Sample & Buy


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Evaluation Boards

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Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.