LTM4644 - Quad DC/DC μModule (Power Module) Regulator with Configurable 4A Output Array


  • Quad Output Step-Down μModule® Regulator with 4A per Output
  • Wide Input Voltage Range: 4V to 14V
  • 2.375V to 14V with External Bias
  • 0.6V to 5.5V Output Voltage
  • 4A DC, 5A Peak Output Current Each Channel
  • Up to 5.5W Power Dissipation (TA = 60°C, 200 LFM, No Heat Sink)
  • ±1.5% Total Output Voltage Regulation
  • Current Mode Control, Fast Transient Response
  • Parallelable for Higher Output Current
  • Output Voltage Tracking
  • Internal Temperature Sensing Diode Output
  • External Frequency Synchronization
  • Overvoltage, Current and Temperature Protection
  • 9mm × 15mm × 5.01mm BGA Package

Typical Application

LTM4644 Typical Application
LTM4644 Typical Application


The LTM®4644/LTM4644-1 is a quad DC/DC step-down μModule (micromodule) regulator with 4A per output. Outputs can be paralleled in an array for up to 16A capability. Included in the package are the switching controllers, power FETs, inductors and support components. Operating over an input voltage range of 4V to 14V or 2.375V to 14V with an external bias supply, the LTM4644/LTM4644-1 supports an output voltage range of 0.6V to 5.5V. Its high efficiency design delivers 4A continuous (5A peak) output current per channel. Only bulk input and output capacitors are needed.


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
LTM4644EY#PBF 15mm × 9mm × 5.01mm BGA BGA E 05-08-1900 Yes
LTM4644IY#PBF 15mm × 9mm × 5.01mm BGA BGA I 05-08-1900 Yes
LTM4644MPY 15mm × 9mm × 5.01mm BGA BGA MP 05-08-1900 No
LTM4644MPY#PBF 15mm × 9mm × 5.01mm BGA BGA MP 05-08-1900 Yes

LTM4644 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
LTM4644EY#PBF 15mm × 9mm × 5.01mm BGA E $32.64 $22.85 Yes
LTM4644IY#PBF 15mm × 9mm × 5.01mm BGA I $35.91 $25.14 Yes
LTM4644MPY 15mm × 9mm × 5.01mm BGA MP $73.44 $51.41 No
LTM4644MPY#PBF 15mm × 9mm × 5.01mm BGA MP $64.64 $45.25 Yes
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* 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
DC1900A LTM4644 Demo Board | Quad Buck µModule Regulator, 4V ≤ VIN ≤ 14V, Vout1 - Vout4 = 3.3V/2.5V/1.5V/1.2V @ 4A Each $65.00
DC2428A LTC2975 Demo Board Set | LTM4644 Quad 4A Power Supply Management (includes DC2382A + DC2363A) [requires DC1613] $200.00
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Companion Boards

Part Number Description Price Documentation
DC1613A USB-to-PMBus Controller for Use with LTpowerPlay $50.00
DC2026C Linduino One Isolated USB Demo Board: An Arduino- and QuikEval-Compatible Code Development Platform $75.00
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Click here to view our complete list of demo boards


  • Multirail Point of Load Regulation
  • FPGAs, DSPs and ASICs Applications

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Design Tools


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 IV:


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:

Design tools for the following parts are available in LTpowerCAD:
LTM4644 Parallel

Technical Support