LTM4609 - 36VIN, 34VOUT High Efficiency Buck-Boost DC/DC μModule (Power Module) Regulator


  • Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
  • Wide VIN Range: 4.5V to 36V
  • Wide VOUT Range: 0.8V to 34V
  • IOUT: 4A DC (10A DC in Buck Mode)
  • Up to 98% Efficiency
  • Current Mode Control
  • Power Good Output Signal
  • Phase-Lockable Fixed Frequency: 200kHz to 400kHz
  • Ultrafast Transient Response
  • Current Foldback Protection
  • Output Overvoltage Protection
  • Small Surface Mount Footprint, Low Profile
    (15mm × 15mm × 2.82mm) LGA and
    (15mm × 15mm × 3.42mm) BGA Packages
  • SnPb (BGA) or RoHS Compliant (LGA and BGA) Finish

Typical Application

LTM4609 Typical Application
LTM4609 Typical Application


The LTM®4609 is a high efficiency switching mode buckboost power supply. Included in the package are the switching controller, power FETs and support components. Operating over an input voltage range of 4.5V to 36V, the LTM4609 supports an output voltage range of 0.8V to 34V, set by a resistor. This high efficiency design delivers up to 4A continuous current in boost mode (10A in buck mode). Only the inductor, sense resistor, bulk input and output capacitors are needed to finish the design.

The low profile package enables utilization of unused space on the bottom of PC boards for high density point of load regulation. The high switching frequency and current mode architecture enable a very fast transient response to line and load changes without sacrificing stability. The LTM4609 can be frequency synchronized with an external clock to reduce undesirable frequency harmonics.

Fault protection features include overvoltage and foldback current protection. The DC/DC μModule® regulator is offered in small 15mm × 15mm × 2.82mm LGA and 15mm × 15mm × 3.42mm BGA packages. The LTM4609 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
LTM4609EV#PBF 15mm x 15mm x 2.82mm LGA LGA E 05-08-1840 Yes
LTM4609EY#PBF 15mm x 15mm x 3.42mm BGA BGA E 05-08-1899 Yes
LTM4609IV#PBF 15mm x 15mm x 2.82mm LGA LGA I 05-08-1840 Yes
LTM4609IY#PBF 15mm x 15mm x 3.42mm BGA BGA I 05-08-1899 Yes
LTM4609MPV#PBF 15mm x 15mm x 2.82mm LGA LGA MP 05-08-1840 Yes
LTM4609MPY 15mm x 15mm x 3.42mm BGA BGA MP 05-08-1899 No
LTM4609MPY#PBF 15mm x 15mm x 3.42mm BGA BGA MP 05-08-1899 Yes

LTM4609 Package Drawing
LTM4609 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
LTM4609EV#PBF 15mm x 15mm x 2.82mm LGA E $32.22 $22.55 Yes
LTM4609EY#PBF 15mm x 15mm x 3.42mm BGA E $35.98 $23.71 Yes
LTM4609IV#PBF 15mm x 15mm x 2.82mm LGA I $35.43 $24.80 Yes
LTM4609IY#PBF 15mm x 15mm x 3.42mm BGA I $37.09 $25.96 Yes
LTM4609MPV#PBF 15mm x 15mm x 2.82mm LGA MP $53.14 $37.20 Yes
LTM4609MPY 15mm x 15mm x 3.42mm BGA MP $70.92 $49.64 No
LTM4609MPY#PBF 15mm x 15mm x 3.42mm BGA MP $54.80 $38.36 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
DC1477B LTM4609EV Demo Board | 34Vout, 4A Buck-Boost uModule Regulator $65.00
Buy Now
Click here to view our complete list of demo boards


  • Telecom, Servers and Networking Equipment
  • Industrial and Automotive Equipment
  • High Power Battery-Operated Devices

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:

  • 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:


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:
LTM4609 Parallel

Technical Support