LTM4623 - Ultrathin 20VIN, 3A Step-Down DC/DC μModule (Power Module) Regulator


  • <2mm Height, Complete Solution in <1cm2 (Single-Sided PCB) or 0.5cm2 (Dual-Sided PCB)
  • Wide Input Voltage Range: 4V to 20V
  • Input Voltage Down to 2.375V with External Bias
  • 0.6V to 5.5V Output Voltage
  • 3A DC Output Current
  • ±1.5% Maximum Total DC Output Voltage Error
  • Current Mode Control, Fast Transient Response
  • Low EMI EN55022 Class B Compliant
  • External Frequency Synchronization
  • Multiphase Operation with Current Sharing
  • Output Voltage Tracking
  • Selectable Discontinuous Mode
  • Power Good Indicator
  • Overvoltage, Overcurrent and Overtemperature Protection
  • Ultrathin (6.25mm × 6.25mm × 1.82mm) LGA Package and (6.25mm × 6.25mm × 2.42mm) BGA Package

Typical Application

LTM4623 Typical Application
LTM4623 Typical Application


The LTM®4623 is a complete 3A step-down switching mode μModule (power module) regulator in a tiny ultrathin 6.25mm × 6.25mm × 1.82mm LGA and 6.25mm × 6.25mm × 2.42mm BGA packages. Included in the package are the switching controller, power FETs, inductor and support components. Operating over an input voltage range of 4V to 20V or 2.375V to 20V with an external bias supply, the LTM4623 supports an output voltage range of 0.6V to 5.5V, set by a single external resistor. Its high efficiency design delivers 3A continuous output current. Only ceramic input and output capacitors are needed.

The LTM4623 supports selectable discontinuous mode operation and output voltage tracking for supply rail sequencing. Its high switching frequency and current mode control enable a very fast transient response to line and load changes without sacrificing stability.

Fault protection features include overvoltage, overcurrent and overtemperature protection.

The LTM4623 is available 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
LTM4623EV#PBF 6.25mm x 6.25mm x 1.82mm LGA LGA E 05-08-1949 Yes
LTM4623EY#PBF 6.25mm x 6.25mm x 2.42mm BGA BGA E 05-08-1502 Yes
LTM4623IV#PBF 6.25mm x 6.25mm x 1.82mm LGA LGA I 05-08-1949 Yes
LTM4623IY 6.25mm x 6.25mm x 2.42mm BGA BGA I 05-08-1502 No
LTM4623IY#PBF 6.25mm x 6.25mm x 2.42mm BGA BGA I 05-08-1502 Yes

LTM4623 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
LTM4623EV#PBF 6.25mm x 6.25mm x 1.82mm LGA E $8.64 $6.05 Yes
LTM4623EY#PBF 6.25mm x 6.25mm x 2.42mm BGA E $9.14 $6.40 Yes
LTM4623IV#PBF 6.25mm x 6.25mm x 1.82mm LGA I $9.50 $6.65 Yes
LTM4623IY 6.25mm x 6.25mm x 2.42mm BGA I $13.36 $9.35 No
LTM4623IY#PBF 6.25mm x 6.25mm x 2.42mm BGA I $10.00 $7.00 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
DC2171A-A LTM4623 Demo Board | Step-Down μModule Regulator, 4V ≤ VIN ≤ 20V, Vout = 1.0/1.2/1.5/1.8/2.5/3.3/5V @ 3A $65.00
DC2721A-A LTM4623EY Demo Board | 20Vin, 3A Step-Down µModule Regulator Configured as Inverting Output. -0.9Vout to -5.2Vout $65.00
Buy Now
Click here to view our complete list of demo boards


  • PCIe and Backside PCB Mounting
  • Telecom, Datacom, Networking and Industrial Equipment
  • Data Storage Rack Units and Cards

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 with questions and comments.

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:

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

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:

Design tools for the following parts are available in LTpowerCAD:

Technical Support