LTM4638 – 20 VIN, 15 A and 12 A Step-Down DC-to-DC μModule® Regulators

LTM4638 – 20 VIN, 15 A and 12 A Step-Down DC-to-DC μModule® Regulators

The LTM4638 is a complete 15A step-down switching mode µModule (power module) regulator in a tiny 6.25mm × 6.25mm × 5.02mm BGA package. Included in the package are the switching controller, power FETs, inductor and support components. Operating over an input voltage range of 3.1V to 20V, the LTM4638 supports an output voltage range of 0.6V to 5.5V, set by a single external resistor. Its high efficiency design delivers up to 15A continuous output current. Only bulk input and output capacitors are needed.

The LTM4638 supports selectable discontinuous mode operation and output voltage tracking for supply rail sequencing. Its high switching frequency and current mode control enable a very fast transient response to line and load changes without sacrificing stability.

Fault protection features include overvoltage, overcurrent and overtemperature protection.


  • Complete Solution in <1cm2 (Single-Sided PCB) or 0.5cm2 (Dual-Sided PCB)
  • 6.25mm × 6.25mm × 5.02mm BGA Package
  • Wide Input Voltage Range: 3.1V to 20V
  • 0.6V to 5.5V Output Voltage
  • 15A DC Output Current
  • ±1.5% Maximum Total DC Output Voltage Error Over Line, Load and Temperature
  • Differential Remote Sensing Amp
  • Current Mode Control, Fast Transient Response
  • External Frequency Synchronization
  • Multiphase Parallel Current Sharing with Multiple LTM4638s
  • Output Voltage Tracking
  • Selectable Discontinuous Mode
  • Power Good Indicator
  • Overvoltage, Overcurrent and Overtemperature Protection

Introducing the LTM4626 and LTM4638, µModules®

This brief animated video highlights the new 4th Generation LTM4626 and LTM4638. These small packaged µModules® have inductors for heat sinks and are highly power-efficient.

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Mike is the founder and editor of, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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