LTM4676A - Dual 13A or Single 26A μModule (Power Module) Regulator with Digital Power System Management


  • Order Custom Programmed Parts
  • Dual, Fast, Analog Loops with Digital Interface for Control and Monitoring
  • Wide Input Voltage Range: 4.5V to 26.5V
  • Output Voltage Range: 0.5V to 5.5V
  • ±0.5% Maximum DC Output Error Over Temperature
  • ±2.5% Current Readback Accuracy at 10A Load
  • 400kHz PMBus-Compliant I2C Serial Interface
  • Integrated 16-Bit ΔΣ ADC
  • Supports Telemetry Polling Rates Up to 125Hz
  • Constant Frequency Current Mode Control
  • Parallel and Current Share Multiple Modules
  • All 7-Bit Slave Addresses Supported
  • Pin-Compatible to Dual 18A LTM4677
  • 16mm × 16mm × 5.01mm BGA Package
  • Download LTpowerPlay Software

Readable Data:

  • Input and Output Voltages, Currents, and Temperatures
  • Running Peak Values, Uptime, Faults and Warnings
  • Onboard EEPROM Fault Log Record with ECC

Writable Data and Configurable Parameters::

  • Output Voltage, Voltage Sequencing and Margining
  • Digital Soft-Start/Stop Ramp
  • OV/UV/OT, UVLO, Frequency and Phasing

Typical Application

LTM4676A Typical Application
LTM4676A Typical Application


The LTM®4676A is a dual 13A or single 26A step-down µModule® (micromodule) DC/DC regulator with 40ms turn-on time. It features remote configurability and telemetry-monitoring of power management parameters over PMBus— an open standard I2C-based digital interface protocol . The LTM4676A is comprised of fast analog control loops, precision mixed-signal circuitry, EEPROM, power MOSFETs, inductors and supporting components.

The LTM4676A’s 2-wire serial interface allows outputs to be margined, tuned and ramped up and down at programmable slew rates with sequencing delay times. Input and output currents and voltages, output power, temperatures, uptime and peak values are readable. At start-up, output voltages, switching frequency, and channel phase angle assignments can be set by pin-strapping resistors. The LTpowerPlay™ GUI and DC1613 USB-to-PMBus converter and demo kits are available.

The LTM4676A is pin-compatible and the improved performance version of the LTM4676.

table class="datatable"> PART
(V) VOUT RANGE (V) PIN-COMPATIBLE LTM4676 170 4.5 to 26.5 0.5V to 4 (CH0)
0.5 to 5.5 (Both CH) Yes LTM4676A 70 4.5 to 26.5 0.5 to 5.5 (Both CH) See Table 1 and page 22 for more on LTM4676A’s enhancements over LTM4676's feature set.


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
LTM4676AEY#PBF 16mm x 16mm x 5.01mm BGA BGA E 05-08-1920 Yes
LTM4676AEY#PBF-ES 16mm x 16mm x 5.01mm BGA BGA E 05-08-1920 Yes
LTM4676AIY 16mm x 16mm x 5.01mm BGA BGA I 05-08-1920 No
LTM4676AIY#PBF 16mm x 16mm x 5.01mm BGA BGA I 05-08-1920 Yes

LTM4676A 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
LTM4676AEY#PBF 16mm x 16mm x 5.01mm BGA E $48.50 $33.95 Yes
LTM4676AEY#PBF-ES 16mm x 16mm x 5.01mm BGA E $48.50 $33.95 Yes
LTM4676AIY 16mm x 16mm x 5.01mm BGA I $69.80 $48.86 No
LTM4676AIY#PBF 16mm x 16mm x 5.01mm BGA I $53.34 $37.34 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
DC1811B-B LTM4676A Demo Board | Step-Down μModule Regulator with PMBus, 4.5V ≤ VIN ≤ 17V, Vout0 = 1V @ 13A, Vout1 = 1.8V @ 13A $65.00
DC1989B-A LTM4676A Demo Board | LTM4676A(x2) Current Shared, PMBus Buck uModule, 4.5V ≤ VIN ≤ 17V, Vout = 0.5V to 4V @ 50A $105.00
DC1989B-B LTM4676A Demo Board | LTM4676A(x3) Current Shared, PMBus Buck uModule, 4.5V ≤ VIN ≤ 17V, Vout = 0.5V to 4V @ 75A $135.00
DC1989B-C LTM4676A Demo Board | LTM4676A(x4) Current Shared, PMBus Buck uModule, 4.5V ≤ VIN ≤ 17V, Vout = 0.5V to 4V @ 100A $165.00
DC2106B-B LTM4676AEY/LTM4630EV Demo Board | PMBus Buck µModule (LTM4676A) + LTM4630 (x3), 4.5V ≤ VIN ≤ 16V, Vout = 0.5V to 1.8V @ 130A $125.00
DC2204B LTM4675 + LTM4676A + LTM4677 + LTM4620A Demo Board | PSM μModule Power Stick $125.00
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Companion Boards

Part Number Description Price Documentation
DC1613A USB-to-PMBus Controller for Use with LTpowerPlay $50.00
DC2086A Powered Programming Adapter for Digital Power System Management Products $199.00
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Click here to view our complete list of demo boards


  • System Optimization, Characterization and Data Mining in Prototype, Production and Field Environments

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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:

Design tools for the following parts are available in LTpowerCAD:
LTM4676 Parallel
LTM4676A Parallel

Technical Support