Step-down µmodule regulator delivers 88% efficiency

Linear Technology has introduced the LTM4639, a 20A DC/DC step-down µModule (micromodule) regulator capable of converting 2.5V to 7V main-power system rails to point-of-load voltages as low as 0.6V with optimum efficiency. In complex rack-mount systems, improved voltage conversion efficiency results in savings in energy consumption, thermal management and equipment size. Applications include cloud-based equipment and RAID systems where 3.3V is preferred as the main power distribution rail.

The LTM4639 is a complete switching point-of-load power supply and includes the inductor, MOSFETs, DC/DC controller and compensation circuitry. It is housed in a 4.92mm height BGA package with a 15mm x 15mm footprint. For 3.3V input to 1.5V output conversion at 20A load, efficiency is 88%, power loss is 3.9W, and junction temperature rise above ambient temperature is 37°C. The micromodule regulator provides a precise output voltage regulation: total DC error of maximum ±1.5%, guaranteed from -40°C to 125°C. Up to four devices can be paralleled for up to 80A output while operating out-of-phase to reduce the number of input and output capacitors.

The LTM4639’s input supply range is 2.375V to 7V. For operation from 3.3V and lower, a 5V low power auxiliary supply is needed to bias internal circuitry. Output voltage ranges from 0.6V to 5.5V, with protection functions for overcurrent and overvoltage conditions.

The LTM4639 is rated for operation from -40°C to 125°C. The 1,000-piece price is $19.45 each.

Summary of Features: LTM4639

  • Low Input Supply Range, Targeting 3.3V Input Supply Rails: 2.375V to 7V
  • Low Output Voltage Regulation, Targeting Sub-2V and Sub-1V Loads Such as ASICs & FPGAs: 0.6V to 5.5V
  • Precision total DC Output Voltage Regulation Over Temperature: ±1.5% Error
  • Current Sharing up to 80A with Four Devices in Parallel
  • Small Package:
    15mm x 15mm x 4.92mm BGA

The USA list pricing shown is for budgetary use only. International prices may differ due to local duties, taxes, fees and exchange rates.

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