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  2. Power Management
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  4. Step-Down (Buck) Regulators
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  6. LTC3774

Data Sheet
JP
User Guides
2 View All

Overview

Features and Benefits

  • Sub-Milliohm DCR Current Sensing
  • Operates with Power Blocks, DRMOS or External Gate Drivers and MOSFETs
  • Supports Phase Shedding and N+1 Phase Redundancy
  • Programmable DCR Temperature Compensation
  • ±0.75% Maximum Total DC Output Error Over Temperature
  • Dual Differential Remote Output Voltage Sense Amplifiers
  • Phase-Lockable Fixed Frequency Range: 200kHz to 1.2MHz
  • VIN Range: 4.5V to 38V
  • VOUT Range: 0.6V to 3.5V
  • Supports Smooth Start-Up into Pre-Biased Outputs
  • Programmable Soft-Start or VOUT Tracking
  • Hiccup Mode/Soft Recovery from Output Overcurrent
  • 36-Lead (5mm × 6mm) QFN Package

Product Details

The LTC3774 is a dual PolyPhase® current mode synchronous step-down switching regulator controller that drives power blocks, DRMOS or external gate drivers and power MOSFETs. It offers an LTC-proprietary technique that enhances the signal-to-noise ratio of the current sense signal, allowing the use of inductors with very low DC winding resistances as the current sense element for maximum efficiency and reduced jitter.

The maximum current sense voltage is programmable from 10mV to 30mV. High speed, low offset remote sense differential amplifiers and a precise 0.6V reference provide accurate output voltages between 0.6V and 3.5V from a wide 4.5V to 38V input supply range. Soft recovery from output shorts or overcurrent minimizes output overshoot. Burst Mode® operation, continuous and pulse-skipping modes are supported. The constant operating frequency can be synchronized to an external clock or linearly programmed from 200kHz to 1.2MHz. Up to six LTC3774 controllers can be paralleled for 1-, 2-, 3-, 4-, 6-, 8- or 12-phase operation.

The LTC3774 is available in a 36-lead (5mm × 6mm) QFN package.

Applications

  • Computer Systems
  • Telecom and Datacom Systems
  • Industrial Equipment
  • DC Power Distribution Systems

Product Categories

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Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (3)

Documentation & Resources

  • View All (9)
  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (2)
  • Videos (2)
  • Application Notes (1)
  • Press Releases (1)
  • Technical Articles (1)
    • Document Type

    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

    LTspice Simulations

    LTC3774/LTC4449 Demo Circuit - High Efficiency Dual Output Buck Converter with Discrete MOSFET Drivers (7-14V to 1.5V & 1.2V @ 30A)
    LTC3774/LTC4449 Demo Circuit - High Efficiency 2-Phase Buck Converter with Discrete MOSFET Drivers (7-14V to 1.2V @ 60A)

    Models for the following parts are available in LTspice:

    LTC3774

    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

    LTpowerCAD Project Files

    LTC3774/LTC4449 Project - High Output Current, 4-Phase Buck Controller for Sub-mΩ Inductor DCR Sensing (10-14V to 1.2V @ 120A)
    LTC3774/LTC4449 Project - Dual Buck Controller for Sub-mΩ Inductor DCR Sensing (7-14V to 1.5V & 1.2V @ 30A)

    Design tools for the following parts are available in LTpowerCAD:

    LTC3774

    Product Recommendations

    LTC3774 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
    LTC3774EUHE#PBF Material Declaration Reliability Data 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)
    LTC3774EUHE#TRPBF Material Declaration Reliability Data 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)
    LTC3774IUHE#PBF Material Declaration Reliability Data 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)
    LTC3774IUHE#TRPBF Material Declaration Reliability Data 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)
    Wafer Fabrication Data R526 Reliability Data

    Support & Discussions

    LTC3774 Discussions

    RE: LTC3882 multiphase current sharing at load step
    RE: LTC3774
    All LTC3774 Discussions
    LTC3774 Contact ADI Technical Support »
    LTC3774 Ask your question »
    LTC3774 Contact ADI Technical Support » LTC3774 Ask your question »

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    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.

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