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  6. LTC3874

Data Sheet
JP
User Guides
3 View All

Overview

Features and Benefits

  • Phase Extender for High Phase Count Voltage Rails
  • Accurate Phase-to-Phase Current Sharing
  • Sub-Milliohm DCR Current Sensing
  • Phase-Lockable Fixed Frequency 250kHz to 1MHz
  • Immediate Response to Master IC's Fault
  • Up to 12 Phase Operation
  • Wide VIN Range: 4.5V to 38V
  • VOUT Range:
    • Up to 3.5V (LOWDCR Pin = INTVCC)
    • Up to 5.5V (LOWDCR Pin = OV)
  • Proprietary Current Mode Control Loop
  • Programmable CCM/DCM Operation
  • Programmable Phase Shift Control
  • Dual N-Channel MOSFET Gate Drivers
  • 28-Lead (4mm × 5mm) QFN Package

Product Details

The LTC3874 is a dual PolyPhase® current mode synchronous step-down slave controller. It enables high current, multi-phase applications when paired with a companion master controller by extending the phase count. Compatible master controllers include the LTC3884, LTC3866, LTC3877 and LTC3774. The LTC3874 employs a unique architecture that enhances the signal-to-noise ratio of the current sense signal, allowing the use of sub-milliohm DC resistance power inductors to maximize efficiency while reducing switching jitter. Its peak current mode architecture allows for accurate phase to phase current sharing even for dynamic loads.

Effectively working with a master controller, the LTC3874 supports all the programmable features as well as fault protection.

Applications

  • High Current Distributed Power Systems
  • Telecom, Datacom, and Storage Systems
  • Intelligent Energy Efficient Power Regulation

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 (13)
  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (3)
  • Design Notes (2)
  • Technical Articles (4)
  • Videos (1)
  • Press Releases (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

    LTC3874/LTC3875 Demo Circuit - High Efficiency, 4-Phase Step-Down Supply with Sub-Milliohm Inductor DCR Sensing (4.5-14V to 1V @ 120A)

    Models for the following parts are available in LTspice:

    LTC3874
    LTC3874-1

    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

    LTC3884 & LTC3874 Project - PolyPhase Digital PSM Step-Down with Ultra-Low DCR Sensing Plus Two Slave Controllers (10-14V to 1V @ 240A)

    Reference Designs (1)

    Product Recommendations

    LTC3874 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
    LTC3874EUFD#PBF Material Declaration Reliability Data 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
    LTC3874EUFD#TRPBF Material Declaration Reliability Data 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
    LTC3874IUFD#PBF Material Declaration Reliability Data 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
    LTC3874IUFD#TRPBF Material Declaration Reliability Data 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
    Wafer Fabrication Data R526 Reliability Data

    PCN-PDN Information

    Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.

    Select Model for PCN Information
    • LTC3874EUFD#PBF Production
    • LTC3874EUFD#TRPBF Production
    • LTC3874IUFD#PBF Production
    • LTC3874IUFD#TRPBF Production

    Support & Discussions

    LTC3874 Discussions

    RE: LTC3877EUK#PBF Power good signal is not stable
    Question about LTspice Model parameters for LTC3884
    All LTC3874 Discussions
    LTC3874 Contact ADI Technical Support »
    LTC3874 Ask your question »
    LTC3874 Contact ADI Technical Support » LTC3874 Ask your question »

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