LTM4650

Dual 25A or Single 50A DC/DC μModule Regulator

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Alternative Parts

LTM4650-1

Dual 25A or Single 50A µModule Regulator with 0.8% DC and 3% Transient Accuracy

Overview

Features and Benefits
Product Details

Features and Benefits

Dual 25A or Single 50A Output
Input Voltage Range: 4.5V to 15V
Output Voltage Range: 0.6V to 1.8V
±1.5% Maximum Total DC Output Error Over Line, Load and Temperature
Differential Remote Sense Amplifier
Current Mode Control/Fast Transient Response
Adjustable Switching Frequency
Frequency Synchronization

Overcurrent Foldback Protection
Multiphase Parallel Current Sharing with Multiple LTM4650s Up to 300A
Internal Temperature Monitor
Pin Compatible with the LTM4620 (Dual 13A, Single 26A) and LTM4630 (Dual 18A, Single 36A)
Selectable Burst Mode^® Operation
Soft-Start/Voltage Tracking
Output Overvoltage Protection
16mm × 16mm × 5.01mm BGA Package

Product Details

The LTM4650 is a dual 25A or single 50A output switching mode step-down DC/DC μModule^® (power module) regulator. Included in the package are the switching controllers, power FETs, inductors, and all supporting components. Operating from an input voltage range of 4.5V to 15V, the LTM4650 supports two outputs each with an output voltage range of 0.6V to 1.8V, each set by a single external resistor. Its high efficiency design delivers up to 25A continuous current for each output. Only a few input and output capacitors are needed. The LTM4650 is pin compatible with the LTM4620 (dual 13A, single 26A) and the LTM4630 (dual 18A, single 36A).

The device supports frequency synchronization, multiphase operation, Burst Mode operation and output voltage tracking for supply rail sequencing and has an onboard temperature diode for device temperature monitoring. High switching frequency and a current mode architecture enable a very fast transient response to line and load changes without sacrificing stability.

Fault protection features include overvoltage and overcurrent protection. The LTM4650 is offered in a 16mm × 16mm × 5.01mm BGA package.


	Vin Range	Vout Range	Comp	DC Vout Accy
LTM4650	4.5V to 15V	0.6V to 1.8V	Internal	1.5%
LTM4650-1B	4.5V to 15V	0.6V to 1.8V	External	1.5%
LTM4650-1A	4.5V to 15V	0.6V to 1.8V	External	0.8%
LTM4650A	4.5V to 16V	0.6V to 5.5V	Internal	1%
LTM4650A-1	4.5V to 16V	0.6V to 5.5V	External	1%

Applications

Processor, ASIC and FPGA Core Power
Telecom and Networking Equipment
Storage and ATCA Cards
Industrial Equipment

Product Categories

Power Management
- µModule Buck Regulators
- Multiple Output Buck Regulators

Markets and Technologies

Data Center

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Product Lifecycle Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (5)

DC2481B-A

LTM4677 and LTM4650 Demo Board | Step-Down μModule Regulator with PMBus Power System Management LTM4677 + LTM4650, 86A

DC2479A-A

LTM4650EY Demo Board | Dual Phase Buck μModule Regulator, 4.5V ≤ V_IN ≤ 15V, V_OUT = 0.6V to 1.8V @ 50A

DC2481A-B

LTM4677/LTM4650 Demo Board | Buck μModule Regulator with Digital PSM, LTM4677 + LTM4650(x3), 4.5V ≤ V_IN ≤ 16V, V_OUT = 0.5V to 1.8V @ 186A

DC2378A-A

LTM4650 Demo Board | Dual Buck µModule Regulator, 4.5V ≤ V_IN ≤ 15V, V_OUT = 0.6V to 1.8V @ 50A or Dual 25A

DC2481A-A

LTM4677/LTM4650 Demo Board | Buck μModule Regulator with Digital PSM, LTM4677 + LTM4650, 4.5V ≤ V_IN ≤ 16V, V_OUT = 0.5V to 1.8V @ 86A

DC2481B-A

View Detailed Evaluation Kit Information

Demonstration circuit 2481B-A is a high efficiency, high density, μModule^® regulator with 4.5V to 15V input range. The output voltage is adjustable from 0.6V to 1.8V, and it can supply 86A maximum load current. The demo board has 1× LTM4677 and 1× LTM4650 μModule regulators. The LTM4677 is a dual 18A or single 36A step-down regulator with PMBus power system management, and the LTM4650 is a dual 25A or single 50A step-down regulator. Please see LTM4677 and LTM4650 data sheets for more detailed information.

DC2481B-A powers up to default settings and produce power based on configuration resistors without the need for any serial bus communication. This allows easy evaluation of the DC/DC converter. To fully explore the extensive power system management features of the part, download the GUI software LTpowerPlay^® onto your PC and use Analog Devices I²C/SMBus/PMBus dongle DC1613A to connect to the board. LTpowerPlay allows the user to reconfigure the part on the fly and store the configuration in EEPROM, view telemetry of voltage, current, temperature and fault status.

For more details and instructions of LTpowerPlay, please refer to LTpowerPlay Software GUI.

Resources

DC2479A-A

View Detailed Evaluation Kit Information

Demonstration circuit 2479A-A features the LTM4650EY, the high efficiency, high density, dual 25A, single 50A switch mode step-down power module regulator. The input voltage is from 4.5V to 15V. The output voltage is programmable from 0.6V to 1.8V. DC2479A-A is configured as dual-phase, single-output, which can deliver up to 50A maximum. The board designs with minimum components to demonstrate this high efficiency, high density μModule. As explained in the data sheet, output current de-rating is necessary for certain V_IN, V_OUT, and thermal conditions. These features and the availability of the LTM4650EY in a compact 16mm × 16mm × 5.01mm BGA package make it ideal for use in many high-density point-of-load applications. The LTM4650 data sheet must be read in conjunction with this demo manual for working on or modifying the demo circuit DC2479A-A.

Resources

DC2481A-B

View Detailed Evaluation Kit Information

Demonstration circuit 2481A-B is a high efficiency, high density, μModule^® regulator with 4.5V to 16V input range. The output voltage is adjustable from 0.5V to 1.8V, and it can supply 186A maximum load current. The demo board has 1× LTM4677 and 3× LTM4650 μModule regulators. The LTM4677 is a dual 18A or single 36A step-down regulator with PMBus power system management, and the LTM4650 is a dual 25A or single 50A step-down regulator. Please see LTM4677 and LTM4650 data sheets for more detailed information.

Resources

DC2378A-A

View Detailed Evaluation Kit Information

Demonstration circuit DC2378A-A features the LTM4650EY, the high efficiency, high density, dual 25A, single 50A, switch mode step-down power module regulator. The input voltage is from 4.5V to 15V. The output voltage is programmable from 0.6V to 1.8V. DC2378A-A can deliver 25A maximum current from each channel. As explained in the data sheet, output current derating is necessary for certain V_IN, V_OUT, and thermal conditions. The board operates in continuous conduction mode in heavy load conditions. For high efficiency at low load currents, the MODE jumper (JP1) selects pulse-skipping mode for noise sensitive applications or Burst Mode^® operation in less noise sensitive applications. Two outputs can be connected in parallel for a single 50A output solution with optional jumper resistors.

Resources

DC2481A-A

View Detailed Evaluation Kit Information

Demonstration circuit 2481A-A is a high efficiency, high density, μModule^® regulator with 4.5V to 16V input range. The output voltage is adjustable from 0.5V to 1.8V, and it can supply 86A maximum load current. The demo board has 1× LTM4677 and 1× LTM4650 μModule regulators. The LTM4677 is a dual 18A or single 36A step-down regulator with PMBus power system management, and the LTM4650 is a dual 25A or single 50A step-down regulator. Please see LTM4677 and LTM4650 data sheets for more detailed information.

Resources

Documentation & Resources

Data Sheets

LTM4650: Dual 25A or Single 50A DC/DC μModule Regulator Data Sheet (Rev. D)
12/12/2016

PDF

2 M

Reliability Data

R504 Reliability Data
3/26/2018

PDF

347 K

User Guides

DC2479A-A - Demo Manual
12/2/2016

PDF

1M
DC2378A-A - Demo Manual
11/22/2016

PDF

1M
DC2481A-B - Demo Manual
6/29/2016

PDF

1M
DC2481A-A - Demo Manual
6/29/2016

PDF

1M

Product Selector Card

μModule Power Products Simplify Power
4/11/2018

PDF

9 M

Informational

μModule Design and Manufacturing Resources
1/30/2018

Technical Articles

Communications Equipment Makers Demand High Power Outputs and Small Solution Footprints
11/1/2018
Ultrathin & High Power µModule Regulators Are Ideal for Communications Systems
7/7/2016

PDF

586K

Design Notes

Flexible, Dual Output, 6-Phase Buck Controller Drives 12 V to 1.0 V/200 A Core Supply with 90.0% Efficiency
11/1/2020

Press Releases

50A or Dual 25A µModule Regulator
9/14/2021

Tools & Simulations

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, 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.

LTspice downloads and documentation

LTspice Simulations

LTM4677 & LTM4650 Demo Circuit - High Current, Parallel µModule Buck Regulators with Power System Management (4.5-16V to 1V @186A)

LTM4677 & LTM4650 Demo Circuit - High Current, Parallel µModule Buck Regulators with Power System Management (4.5-16V to 1V @ 86A)

LTM4650 Demo Circuit - High Efficiency Single 50A Step-Down Regulator (4.5-15V to 1V @ 50A)

LTM4650 Demo Circuit - High Efficiency Dual 25A Step-Down Regulator with Output Tracking (4.5-15V to 1.5 V @ 25A & 1V @ 25A)

Models for the following parts are available in LTspice:

LTM4650

LTM4650-1

LTM4650A

LTM4650A-1

LTpowerCAD

LTpowerCAD^® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

To open the project file for this circuit:

Step 1: Download and install LTpowerCAD on your computer.

Step 2: Click on the link(s) in the section below to download part-specific project files.

Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.

LTpowerCAD download and documentation

LTpowerCAD Project Files

LTM4650 Project - High Efficiency Single 50A Step-Down Regulator (4.5-15V to 1.2V @ 50A)

LTM4650 Project - Dual 25A Buck uModule Regulator (4.5-14V to 1.5V @ 25A & 1V @ 25A)

Design tools for the following parts are available in LTpowerCAD:

LTM4650

LTM4650-1

LTM4650A

LTM4650A-1

Reference Designs (4)

HTG-910: Xilinx Virtex UltraScale+™ Low-Profile PCI Express Development Platform

Intel Stratix 10 FPGA PCIe Development Kit

Stratix 10 GX Signal Integrity Development Kit

HTG-Z922: Xilinx ZYNQ® UltraScale+™ MPSoC PCI Express Development Platform

HTG-910: Xilinx Virtex UltraScale+™ Low-Profile PCI Express Development Platform

View Detailed Reference Design Information

Features & Benefits

The HTG-910 is low profile network card that provides access to eight lanes of PCI Express. It is populated with the Xilinx Zynq Virtex Ultrascale VU5P, VU9P, VU13P or Ultrascale VU190 FPGA. Analog Devices power solution on this platform is fully validated to meet the requirements of Xilinx Zynq Virtex Ultrascale FPGAs to ensure a robust power delivery solution.

DC/DC μModule regulators are used on the HTG-910 to power Xilinx FPGA and/or SoC rails as well as other system rails. These regulators are highly integrated solutions with built in controller, power FETs, inductors, and capacitors that simplify layout and provide robust power delivery performance.

We provide supporting documentation including power schematics, layout, LTpowerPlanner and applicable LTpowerPlay configuration files to enable you to validate the power solution for your application seamlessly.

Parts Used

Intel Stratix 10 FPGA PCIe Development Kit

View Detailed Reference Design Information

Features & Benefits

Analog Devices has worked closely with Intel PSG to develop verified power solutions that optimize cost, size and efficiency in high performance applications.
The validated power solutions include uModules power products that address time and space constraints while delivering high efficiency, reliability, and low noise.
The actual power tree represents the best solution at time of design.
A recommended power tree has also been included to present the ideal solution at time of Stratix 10 GX PCIe development kit release. An updated alternate version of the power tree represents the latest solutions available from Analog Devices. For many applications, an intermediate rail is not ideal, so recommendations an alternate power tree that allow for direct power conversion from 12V input is provided below.

Parts Used

Stratix 10 GX Signal Integrity Development Kit

View Detailed Reference Design Information

Features & Benefits

Analog Devices has worked closely with Intel PSG to develop verified power solutions that optimize cost, size and efficiency in high performance applications.
The validated power solutions include uModules power products that address time and space constraints while delivering high efficiency, reliability, and low noise.
The actual power tree represents the best solution at time of design.
A recommended power tree has also been included to present the ideal solution at time of Stratix 10 GX SI development kit release. An updated alternate version of the power tree represents the latest solutions available from Analog Devices. For many applications, an intermediate rail is not ideal, so recommendations for an alternate power tree that allows for direct power conversion from 12V input is provided below.

Parts Used

HTG-Z922: Xilinx ZYNQ® UltraScale+™ MPSoC PCI Express Development Platform

View Detailed Reference Design Information

Features & Benefits

The HTG-Z922 provides access to large FPGA gate densities, wide range of I/O and expandable DDR4 memory for variety of different programmable applications. It is populated with the Xilinx Zynq Ultrascale+ ZU17-2 or ZU19-2 FPGA. Analog Devices power solution on this platform is fully validated to meet the requirements of Xilinx Zynq Ultrascale+ FPGAs to ensure a robust power delivery solution.

DC/DC μModule regulators are used on the HTG-Z922 to power Xilinx FPGA and/or SoC rails as well as other system rails. These regulators are highly integrated solutions with built in controller, power FETs, inductors, and capacitors that simplify layout and provide robust power delivery performance.

Parts Used

Product Recommendations

LTM4650 Companion Parts

Recommended Related Parts

LTC2975.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.

Quality And Reliability

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PCN-PDN Information

Request Product/Process Change Notifications

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Support & Discussions

LTM4650 Discussions

RE: LTM4650A & LTC2971 application issue

16 week(s) ago in Power Management

RE: ltm4650-1 there's an error in Vout

All LTM4650 Discussions

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.