LTM4637 - 20A DC/DC μModule (Power Module) Step-Down Regulator

Features

  • 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

Typical Application

LTM4637 Typical Application
LTM4637 Typical Application

Description

The LTM®4637 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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTM4637EV#PBF 15mm x 15mm x 4.32mm LGA LGA E 05-08-1906 Yes
LTM4637EY#PBF 15mm x 15mm x 4.92mm BGA BGA E 05-08-1940 Yes
LTM4637IV#PBF 15mm x 15mm x 4.32mm LGA LGA I 05-08-1906 Yes
LTM4637IY#PBF 15mm x 15mm x 4.92mm BGA BGA I 05-08-1940 Yes


LTM4637 Package Drawing
LTM4637 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTM4637EV#PBF 15mm x 15mm x 4.32mm LGA E $31.57 $22.10 Yes
LTM4637EY#PBF 15mm x 15mm x 4.92mm BGA E $33.23 $23.26 Yes
LTM4637IV#PBF 15mm x 15mm x 4.32mm LGA I $34.73 $24.31 Yes
LTM4637IY#PBF 15mm x 15mm x 4.92mm BGA I $36.37 $25.46 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1872A LTM4637EV Demo Board | µModule Regulator, 4.5V ≤ VIN ≤ 20V, Vout = 1V to 1.8V @ 20A $65.00
Buy Now
Click here to view our complete list of demo boards

Applications

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

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.

Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, 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

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LTM4637

LTpowerCAD

The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD

To open the project file for this circuit:

  • Step 1: If you have not installed LTpowerCAD on this computer, download and install LTpowerCAD
  • Step 2: Once LTpowerCAD is installed, click on the link(s) below to open the project file
  • Step 3: If LTpowerCAD does not automatically open after clicking the link above, you can open the project file by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTpowerCAD and open the project file by selecting 'Open Project' from the 'File' menu

Design tools for the following parts are available in LTpowerCAD:
LTM4637
LTM4637 Parallel

Technical Support