LTM4631

RECOMMENDED FOR NEW DESIGNS

Ultrathin Dual 10A or Single 20A DC/DC μModule Regulator

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Overview

  • Dual 10A or Single 20A 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
  • Overcurrent Foldback Protection
  • Multiphase Parallel Current Sharing with Multiple LTM4631s
  • Frequency Synchronization
  • Internal Temperature Monitor
  • Selectable Burst Mode® Operation
  • Soft-Start/Voltage Tracking
  • Output Overvoltage Protection
  • Ultrathin 16mm × 16mm × 1.91mm LGA and 16mm x 16mm x 2.51mm BGA Packages

The LTM4631 is a dual 10A or single 20A output switching mode step-down DC/DC μModule® (power module) regulator. Included in the package are the switching controller, power FETs, inductors and all supporting components. Operating from an input voltage range of 4.5V to 15V, the LTM4631 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 10A continuous current for each output. Only a few input and output capacitors are needed.

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 LTM4631 is offered in an ultrathin 16mm × 16mm × 1.91mm LGA and 16mm x 16mm x 2.51mm BGA packages. The LTM4631 is available with SnPb (BGA) or ROHS compliant terminal finish.

Applications

  • Telecom and Networking Equipment
  • Storage and ATCA Cards
  • Industrial Equipment
LTM4631
Ultrathin Dual 10A or Single 20A DC/DC μModule Regulator
LTM4631 Typical Application Image 1 LTM4631 Typical Application Image 2 LTM4631 Package Image 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Power System Management (PSM) & Sequencers 1
LTC2975
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Input Current and Energy Measurement
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTM4631

LTpowerCAD 1

Design tools for the following parts are available in LTpowerCAD:

  • LTM4631
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.

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.

Evaluation Kits

eval board
schematic 1
DC2268A-G

LTM4631 Demo Board | Dual 10A or Single 20A μModule Regulator

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Product Details

Demonstration circuit 2268A-G is a high efficiency, high density, dual 10A, switch mode step-down power supply on a compact 1.5-inch × 1.2-inch PCB. It features the LTM4631 µModule® regulator. The input voltage is from 4.5V to 15V. The output voltage is programmable from 0.6V to 1.8V. DC2268A-G can deliver up to 10A maximum in each channel. As explained in the data sheet, output current derating is necessary for certain VIN, VOUT, and thermal conditions. The board operates in continuous conduction mode in heavy load conditions. For high efficiency at low load currents, the resistor jumper (R1/R2) 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 20A output solution with optional jumper resistors.

The board allows the user to program how its output ramps up and down through the TRACK/SS pin. Remote output voltage sensing is available for improved output voltage regulation at the load point. An optional input inductor L1 reduces the EMI noise for noise sensitive applications. DC2268A can be easily inserted to an edge connector for testing and debugging. These features and the availability of the LTM4631 in a compact 16mm × 16mm × 4.41mm LGA package make it ideal for use in many high density point-of-load regulation applications. The LTM4631 data sheet must be read in conjunction with the demo manual for working on or modifying the DC2268A-G.

eval board
schematic 2
schematic 3
schematic 4
schematic 5
DC2147A

LTM4631 Demo Board | Buck Module Regulator, 4.5V ≤ VIN ≤ 15V, VOUT1/VOUT2 = 1.2V/1.0V @ 10A

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Product Details

Demonstration circuit 2147A features the LTM4631, the high efficiency, high density, dual 10A, switch mode step-down μModule® power module regulator in an ultrathin 1.91mm height package. The input voltage is from 4.5V to 15V and the demo board provides 1.2V and 1V outputs at up to 10A maximum from each channel. As explained in the data sheet, output current derating is necessary for certain VIN , VOUT , 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 20A output solution with optional jumper resistors. The board allows the user to program how its output ramps up and down through the TRACK/SS pin. The output can be set up to either coincidentally or ratio-metrically track with another supply’s output. Remote output voltage sensing is available for improved output voltage regulation at the load point. These features and the availability of the LTM4631 in a compact 16mm × 16mm × 1.91mm LGA package make it ideal for use in many high density point-of-load regulation applications. The LTM4631 data sheet must be read in conjunction with this demo manual for working on or modifying the demo circuit DC2147A.
DC2268A-G
LTM4631 Demo Board | Dual 10A or Single 20A μModule Regulator
DC2268A-G Evaluation Board
DC2147A
LTM4631 Demo Board | Buck Module Regulator, 4.5V ≤ VIN ≤ 15V, VOUT1/VOUT2 = 1.2V/1.0V @ 10A
DC2147A Demo Board DC2147A Demo Board DC2147A Demo Board DC2147A Demo Board

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