Power Management Switching Regulator Step-Down (Buck) Regulators Multiple Output Buck
µModule Solutions µModule Regulators µModule Buck Regulators


LTC2970 - Dual I2C Power Supply Monitor and Margining Controller

LTC2975 - 4-Channel PMBus Power System Manager Featuring Accurate Input Current and Energy Measurement

LTM4642 - 20VIN, Dual 4A or Single 8A DC/DC μModule Regulator

Features

  • Small Form Factor Dual 4A Power Supply
  • Wide Input Voltage Range: 4.5V to 20V (2.375V Min with CPWR Bias)
  • Dual 180° Out-of-Phase Outputs with 4A DC
  • Dual Outputs with 0.6V to 5.5V Range
  • Output Voltage Tracking
  • ±1.5% Maximum Total DC Output Voltage Error,
  • Up to 95% Maximum Efficiency
  • Phase-Lockable Fixed Frequency 600kHz to 1.4MHz
  • Constant On-Time, Valley Current Mode Architecture
  • Parallel Current Sharing
  • Selectable Burst Mode® Operation
  • Output Overvoltage and Overcurrent Protection
  • 9mm × 11.25mm × 4.92mm BGA Package

Typical Application

LTM4642 Typical Application
LTM4642 Typical Application

Description

The LTM®4642 is a complete dual 4A or single 8A step-down DC/DC μModule® (micromodule) regulator. Included in the package are the switching controller, power FETs, inductor, and all support components. Operating over input voltage ranges of 4.5V to 20V, (2.375V min with external CPWR bias), the LTM4642 supports two outputs with voltage ranges of 0.6V to 5.5V, set by a single external resistor. Its high efficiency design delivers 4A continuous current (5A peak) for each output.

High switching frequency and a valley current mode architecture enable a very fast transient response to line and load changes without sacrificing stability. The two outputs are interleaved with 180° phase to minimize the ripple noise and reduce the I/O capacitors.

The power module is offered in a 9mm × 11.25mm × 4.92mm BGA package. The LTM4642 is RoHS compliant with Pb-free finish.

Packaging

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
Drawing		 RoHS
LTM4642EY#PBF 11.25mm x 9mm x 4.92mm BGA BGA E 05-08-1961 Yes
LTM4642IY#PBF 11.25mm x 9mm x 4.92mm BGA BGA I 05-08-1961 Yes


LTM4642 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
(1-99)		 Price
(1k)*		 RoHS
LTM4642EY#PBF 11.25mm x 9mm x 4.92mm BGA E $22.86 $16.00 Yes
LTM4642IY#PBF 11.25mm x 9mm x 4.92mm BGA I $25.14 $17.60 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
DC2194A LTM4642 Demo Board | Dual Buck μModule Regulator, 2.5V ≤ VIN ≤ 20VIN, Vout1 = 1.8V @ 4A, Vout2 = 1.2V @ 4A $65.00
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Click here to view our complete list of demo boards

Applications

  • Telecom and Networking Equipment
  • Servers
  • FPGA Power

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Design Tools

LTspice

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:
LTM4642

LTpowerCAD

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:
LTM4642
LTM4642 Parallel

Technical Support