DC/DC step-down module targets cloud-based equipment
Capable of converting 2.5V to 7V main-power system rails to point-of-load voltages as low as 0.6V, a 20A DC/DC step-down µModule regulator has been released by Linear Technology. The LTM4639 is suitable for cloud-based equipment and RAID systems where 3.3V is preferred as the main power distribution rail. In complex rack-mount systems, improved voltage conversion efficiency results in savings in energy consumption, thermal management and equipment size.
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 15x15mm 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 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 2.375 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 0.6 to 5.5V, with protection functions for overcurrent and overvoltage conditions.
The LTM4639 is rated for operation from -40 to 125°C. The 1,000-piece price is $19.45 each.
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