LTM4603 - 6A DC/DC µModule (Power Module) with PLL, Output Tracking and Margining


  • Complete Switch Mode Power Supply
  • Wide Input Voltage Range: 4.5V to 20V
  • 6A DC Typical, 8A Peak Output Current
  • 0.6V to 5V Output Voltage
  • Output Voltage Tracking and Margining
  • Remote Sensing for Precision Regulation (LTM4603 Only)
  • Typical Operating Frequency: 1MHz
  • PLL Frequency Synchronization
  • 1.5% Regulation
  • Current Foldback Protection (Disabled at Start-Up)
  • Pin Compatible with the LTM4601
  • Pb-Free (e4) RoHS Compliant Package with Gold Finish Pads
  • Ultrafast Transient Response
  • Current Mode Control
  • Up to 93% Efficiency at 5VIN, 3.3VOUT
  • Programmable Soft-Start
  • Output Overvoltage Protection
  • Small Footprint, Low Profile (15mm × 15mm × 2.8mm) Surface Mount LGA Package

Typical Application

LTM4603 Typical Application
LTM4603 Typical Application


The LTM4603 is a complete 6A step-down switch mode DC/DC power supply with onboard switching controller, MOSFETs, inductor and all support components. The µModule is housed in a small surface mount 15mm × 15mm × 2.8mm LGA package. Operating over an input voltage range of 4.5 to 20V, the LTM4603 supports an output voltage range of 0.6V to 5V as well as output voltage tracking and margining. The high efficiency design delivers 6A continuous current (8A peak). Only bulk input and output capacitors are needed to complete the design.

The low profile (2.8mm) and light weight (1.7g) package easily mounts on the unused space on the back side of PC boards for high density point of load regulation. The µModule can be synchronized with an external clock for reducing undesirable frequency harmonics and allows PolyPhase® operation for high load currents.

A high switching frequency and adaptive on-time current mode architecture deliver a very fast transient response to line and load changes without sacrificing stability. An onboard remote sense amplifier can be used to accurately regulate an output voltage independent of load current. The onboard remote sense amplifier is not available in the LTM4603-1. The LTM4603/LTM4603-1 are pin compatible with the 12A LTM4601/LTM4601-1.


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
LTM4603EV-1#PBF 15mm × 15mm x 2.82mm LGA LGA E 05-08-1801 Yes
LTM4603EV#PBF 15mm × 15mm x 2.82mm LGA LGA E 05-08-1801 Yes
LTM4603IV-1#PBF 15mm × 15mm x 2.82mm LGA LGA I 05-08-1801 Yes
LTM4603IV#PBF 15mm × 15mm x 2.82mm LGA LGA I 05-08-1801 Yes

LTM4603 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
LTM4603EV-1#PBF 15mm × 15mm x 2.82mm LGA E $19.66 $12.95 Yes
LTM4603EV#PBF 15mm × 15mm x 2.82mm LGA E $20.49 $13.50 Yes
LTM4603IV-1#PBF 15mm × 15mm x 2.82mm LGA I $21.63 $14.25 Yes
LTM4603IV#PBF 15mm × 15mm x 2.82mm LGA I $22.54 $14.85 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
DC1083A-A LTM4603 Demo Board | Step-Down μModule Regulator, 4.5V ≤ VIN ≤ 20V, Vout = 0.6V/1.2V/1.5V/1.8V/2.5V/3.3V/5V @ 6A $65.00
DC1540B LTC2977 Demo Board Set: Eight uModule Power Supply Management (includes DC1360B + DC1361B) [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
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Click here to view our complete list of demo boards


  • Telecom and Networking Equipment
  • Servers
  • Industrial Equipment
  • Point of Load Regulation

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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

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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:

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