LTM4650A-1 - Dual 25A or Single 50A DC/DC μModule Regulator with 1% DC Accuracy


  • Dual 25A or Single 50A Output
  • Input Voltage Range: 4.5V to 16V
  • Output Voltage Range: 0.6V to 5.5V
  • ±1% Maximum Total DC Output Error Over Line, Load and Temperature
  • Higher Light Load Efficiency and Wider VOUT Range Than LTM4650-1
  • Adjustable Control Loop Compensation
  • Differential Remote Sense Amplifier
  • Current Mode Control/Fast Transient Response
  • Multiphase Parallel Current Sharing Up to 300A
  • Internal Temperature Monitor
  • Adjustable Switching Frequency or Synchronization
  • Overcurrent Foldback Protection
  • Selectable Burst Mode® Operation, Pulse-Skipping Mode Operation
  • Soft-Start/Voltage Tracking
  • Output Overvoltage Protection
  • 16mm × 16mm × 5.01mm BGA Package

Typical Application


The LTM®4650A-1 is a dual 25A or single 50A output switching mode step-down DC/DC μModule® (micromodule) regulator with ±1% total DC output error. Included in the package are the switching controllers, power FETs, inductors and all supporting components. Operating from an input voltage range of 4.5V to 16V, the LTM4650A-1 supports two outputs with an output voltage range of 0.6V to 5.5V, each set by a single external resistor. Its high efficiency design delivers up to 25A continuous current for each output. Only a few input and output capacitors are needed. Adjustable control loop compensation allows for fast transient response to minimize output capacitance when powering FPGAs, ASICs, and processors.

Fault protection features include overvoltage and overcurrent protection. The LTM4650A-1 is offered in 16mm × 16mm × 5.01mm BGA package.

  Vin Range Vout Range Comp DC Vout Accy
LTM4650 4.5V to 15V 0.6V to 1.8V Internal 1.5%
LTM4650-1B 4.5V to 15V 0.6V to 1.8V External 1.5%
LTM4650-1A 4.5V to 15V 0.6V to 1.8V External 0.8%
LTM4650A 4.5V to 16V 0.6V to 5.5V Internal 1%
LTM4650A-1 4.5V to 16V 0.6V to 5.5V External 1%


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

Part Number Package Code Temp Package
LTM4650AEY-1#PBF 16mm × 16mm × 5.01mm BGA BGA E 05-08-1523 Yes
LTM4650AIY-1 16mm × 16mm × 5.01mm BGA BGA I 05-08-1523 No
LTM4650AIY-1#PBF 16mm × 16mm × 5.01mm BGA BGA I 05-08-1523 Yes

LTM4650A-1 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
LTM4650AEY-1#PBF 16mm × 16mm × 5.01mm BGA E $68.57 $48.00 Yes
LTM4650AIY-1 16mm × 16mm × 5.01mm BGA I $91.89 $64.32 No
LTM4650AIY-1#PBF 16mm × 16mm × 5.01mm BGA I $75.43 $52.80 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
DC2603A-B LTM4650AEY-1 Demo Board | Dual 25A or Single 50A DC/DC μModule Regulator with 1% DC Accuracy $65.00
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Click here to view our complete list of demo boards


  • Telecom and Networking Equipment
  • Storage and ATCA Cards
  • Industrial Equipment

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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

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:
LTM4650 Parallel
LTM4650-1 Parallel
LTM4650A Parallel
LTM4650A-1 Parallel

Technical Support