comment on this article

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

The LTM4650 is a dual 25A or single 50A output switching mode step-down DC/DC µModule® 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.

In conjunction with Arrow Electronics Ltd.

The LTM4650 is a dual 25A or single 50A output step-down µModule® regulator with onboard shielded inductors, MOSFETs and a dual DC/DC regulator IC housed in a small thermally enhanced plastic package.

The device is offered in a 16mm x 16mm x 5.01mm BGA with a patented built-in heat sink. The heat sink, attached to the MOSFETs and inductors, rapidly moves heat from the interior of the package to the top, where the surface of the heat sink is exposed to air.

Thermal dissipation is further improved with airflow, or a combination of airflow and attachment to an external heat sink. With no external heat sink, the LTM4650 delivers 50A from 12VIN to 0.9VOUT at up to 71°C ambient temperature with 200LFM airflow or up to 77°C with 400LFM.

The LTM4650’s precision current-mode architecture allows four devices to multiphase current share, delivering up to 300A to loads such as ASICs, FPGAs and microcontrollers. DC/DC conversion efficiency is improved by using Linear Technology’s DC/DC regulator IC with strong gate drivers and low loss MOSFETs. While delivering 50A, 92% efficiency is recorded at 5VIN, 1.8VOUT and 86% efficiency at 12VIN, 1.0VOUT.

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.

With a differential remote sense amplifier to compensate for voltage drop due to circuit board trace impedance, the LTM4650 guarantees ±1.5% maximum total DC output voltage accuracy over line, load and temperature.

The LTM4650 is offered in a 16mm × 16mm × 5.01mm BGA package and is rated for operation from –40ºC to 125ºC. The 1,000-piece price starts at $46.75 each.

The LTM4650 is pin compatible with the LTM4620 (dual 13A, single 26A) and the LTM4630 (dual 18A, single 36A).

For more information, visit .

Summary of Features of the LTM4650:

  • 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 & Temperature
  • Differential Remote Sense Amplifier
  • Multiphase Parallel Current Sharing with Multiple LTM4650s Up to 300A
  • Pin Compatible with the LTM4620 Dual 13A, Single 26A & LTM4630 Dual 18A, Single 36A
  • 16mm × 16mm × 5.01mm BGA Package


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

Linear Technology (UK) Limited
Tel: +44 (0)1628 477066

Web site:

Linear Technology (UK) Limited

Comment on this article

This material is protected by MA Business copyright See Terms and Conditions. One-off usage is permitted but bulk copying is not. For multiple copies contact the sales team.

What you think about this article:

Add your comments


Your comments/feedback may be edited prior to publishing. Not all entries will be published.
Please view our Terms and Conditions before leaving a comment.

Related Articles