LTM4638 µModule® Regulator

By Linear Technology 125

LTM4638 µModule® Regulator

Power by Linear Technology/Analog Devices’ LTM4638 is a 20 V, 15 A step-down switching mode µModule (power module) regulator. Included in the package are the switching controller, power FETs, inductor, and support components. Operating over an input voltage range of 3.1 V to 20 V, the LTM4638 supports an output voltage range of 0.6 V to 5.5 V, set by a single external resistor. Its high-efficiency design delivers up to 15 A 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. The LTM4638 comes in a tiny 6.25 mm × 6.25 mm × 5.02 mm BGA package that is perfect for networking, industrial, and diagnostic equipment.

Typical Application
Output Efficiency vs Load Current
  • Input voltage range: 3.1 V to 20 V
  • 0.6 V to 5.5 V output-voltage
  • 15 ADC 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
  • 6.25 mm × 6.25 mm × 5.02 mm BGA package
  • Telecom, datacom, networking, and industrial equipment
  • Medical diagnostic equipment
  • Data storage rack units and cards
  • Test and debug systems

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