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  5. LTM4637

Data Sheet
JP
User Guides
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Overview

Features and Benefits

  • Complete 20A Switch Mode Power Supply
  • 4.5V to 20V Input Voltage Range
  • 0.6V to 5.5V Output Voltage Range
  • ±1.5% Total DC Output Voltage Error (–40°C to 125°C)
  • Differential Remote Sense Amplifier for Precision Regulation for (VOUT ≤ 3.3V)
  • Current Mode Control/Fast Transient Response
  • Parallel Current Sharing (Up to 80A)
  • Frequency Synchronization
  • Selectable Pulse-Skipping or Burst Mode® Operation
  • Soft-Start/Voltage Tracking
  • Up to 88% Efficiency (12VIN, 1.8VOUT)
  • Overcurrent Foldback Protection
  • Output Overvoltage Protection
  • Internal Temperature Monitor
  • Overtemperature Protection
  • 15mm × 15mm × 4.32mm LGA and 15mm × 15mm × 4.92mm BGA Packages
  • SnPb (BGA) or RoHS Compliant (LGA and BGA) Finish

Product Details

The LTM4637 is a complete 20A output high efficiency switch mode step-down DC/DC μModule (power module) regulator. Included in the package are the switching controller, power FETs, inductor and compensation components. Operating over an input voltage range from 4.5V to 20V, the LTM4637 supports an output voltage range of 0.6V to 5.5V, set by a single external resistor. Only a few input and output capacitors are needed.

Current mode operation allows precision current sharing of up to four LTM4637 regulators to obtain up to 80A output. High switching frequency and a current mode architecture enable a very fast transient response to line and load changes without sacrificing stability. The device supports frequency synchronization, multiphase/current sharing, Burst Mode operation and output voltage tracking for supply rail sequencing. A diode-connected PNP transistor is available for use as an internal temperature monitor.

The LTM4637 is offered in 15mm × 15mm × 4.32mm LGA and 15mm × 15mm × 4.92mm packages. The LTM4637 is available with SnPb (BGA) or RoHS compliant terminal finish. The LTM4637 is pin compatible with the LTM4627, a 15A DC/DC μModule regulator.

Applications

  • Telecom Servers and Networking Equipment
  • Industrial Equipment
  • Medical Systems
  • High Ambient Temperature 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 (1)

Documentation & Resources

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  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (1)
  • Product Selector Card (3)
  • Informational (1)
  • Design Notes (1)
  • Press Releases (1)
  • Webcasts (1)
  • Technical Articles (2)
    • 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

    LTM4637 Demo Circuit - High Efficiency 20A µModule Buck Regulator (4.5-20V to 1.2V @ 20A)

    Models for the following parts are available in LTspice:

    LTM4637

    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

    LTM4637 Project - 20A Step-Down μModule Regulator (4.5-20V to 1.8V @ 20A)

    Design tools for the following parts are available in LTpowerCAD:

    LTM4637

    Reference Designs (1)

    Product Recommendations

    LTM4637 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
    LTM4637EV#PBF Material Declaration Reliability Data 133-Lead LGA (15mm x 15mm x 4.32mm)
    LTM4637EY#PBF Material Declaration Reliability Data 133-Lead BGA (15mm x 15mm x 4.92mm)
    LTM4637IV#PBF Material Declaration Reliability Data 133-Lead LGA (15mm x 15mm x 4.32mm)
    LTM4637IY Material Declaration Reliability Data 133-Lead BGA (15mm x 15mm x 4.92mm)
    LTM4637IY#PBF Material Declaration Reliability Data 133-Lead BGA (15mm x 15mm x 4.92mm)
    Wafer Fabrication Data R504 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
    • LTM4637EV#PBF Production
    • LTM4637EY#PBF Production
    • LTM4637IV#PBF Production
    • LTM4637IY Production
    • LTM4637IY#PBF Production

    Support & Discussions

    LTM4637 Discussions

    RE: Review of LTM4637EV,LTM4624EY power regulator
    RE: LTM4637:Satbility in light load
    All LTM4637 Discussions
    LTM4637 Contact ADI Technical Support »
    LTM4637 Ask your question »
    LTM4637 Contact ADI Technical Support » LTM4637 Ask your question »

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