40A µModule Regulator with, 88% Efficiency, 0% Derating at 85°C, and 40°C Rise

February 28, 2017 // By Luc Desimpel

The LTM4636 is a 40A step-down µModule switching regulator with 3D packaging construction for quicker heat dissipation and cooler operation in a small package. By stacking its inductor on top of a 16mm x 16mm BGA package, the LTM4636 benefits from the exposed inductor as a heat sink permitting direct contact with airflow from any direction to cool the device. The LTM4636 can deliver 40W (12V IN, 1V OUT, 40A, 200LFM) with only 40°C rise over the ambient temperature. Full-power 40W is delivered up to 83°C ambient and half-power 20W is supported at 110°C ambient.

The LTM4636 operates at 92%, 90% and 88% efficiency delivering 15A, 30A and 40A, respectively, to a 1V load (12V IN). The µModule regulator is scalable where four LTM4636s in current sharing mode deliver 160W with only 40°C rise and 88% efficiency (12V IN, 1V OUT, 400LFM).