LTM4643 - Ultrathin Quad μModule Regulator with Configurable 3A Output Array


  • Quad Output Step-Down μModule® Regulator with 3A per Output
  • Wide Input Voltage Range: 4V to 20V
  • 2.375V to 20V with External Bias
  • 0.6V to 3.3V Output Voltage
  • 3A DC Output Current Each Channel
  • ±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 × 1.82mm LGA and 9mm × 15mm × 2.42mm BGA Packages

Typical Application

LTM4643 Typical Application
LTM4643 Typical Application


The LTM®4643 is a quad DC/DC step-down μModule (power module) regulator with 3A per output. Outputs can be paralleled in an array for up to 12A capability. Included in the package are the switching controllers, power FETs, inductors and support components. Operating over an input voltage range of 4V to 20V or 2.375V to 20V with an external bias supply, the LTM4643 supports an output voltage range of 0.6V to 3.3V each set by a single external resistor. Its high efficiency design delivers 3A continuous output current per channel. Only bulk input and output capacitors are needed.

Fault protection features include overvoltage, overcurrent and overtemperature protection. The LTM4643 is offered in a 9mm ×15mm × 1.82mm LGA and 9mm × 15mm × 2.42mm BGA packages with SnPb (BGA) or RoHS compliant terminal finish.


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
LTM4643EV#PBF 15.00mm × 9.00mm ×1.82mm LGA LGA E 05-08-1508 Yes
LTM4643IV#PBF 15.00mm × 9.00mm ×1.82mm LGA LGA I 05-08-1508 Yes
LTM4643MPV#PBF 15.00mm × 9.00mm ×1.82mm LGA LGA MP 05-08-1508 Yes

LTM4643 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
LTM4643EV#PBF 15.00mm × 9.00mm ×1.82mm LGA E $28.43 $19.90 Yes
LTM4643IV#PBF 15.00mm × 9.00mm ×1.82mm LGA I $31.27 $21.89 Yes
LTM4643MPV#PBF 15.00mm × 9.00mm ×1.82mm LGA MP $56.29 $39.40 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
DC2453A LTM4643 Demo Board | Quad Buck μModule Regulator with Configurable 3A Output Array $65.00
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Click here to view our complete list of demo boards


  • FPGAs, GPUs and ASICs Applications
  • PCIe and Backside PCB Mounting

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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

Models for the following parts are available in LTspice:


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

Design tools for the following parts are available in LTpowerCAD:
LTM4643 Parallel

Technical Support