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New 40-A µModule Regulator with 3-D Stacked-Inductor Packaging

Linear Technology recently introduced the LTM4636, which is a 40-A step-down µModule switching regulator with 3D construction for quicker heat dissipation and cooler operation in a small package. By stacking its inductor on top of a 16 mm × 16 mm 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.Linear LTM4636

The LTM4636 features, specs, and benefits:

  • Stacked inductor acts as heatsink; exposed inductor on top of package (3D construction)
  • Scalable: two to six devices in parallel delivers 80-to-240-A load current
  • Delivers 40 W (12 VIN, 1 VOUT, 40 A, 200 LFM) with only 40°C rise over ambient temperature.
  • Full-power 40 W is delivered up to 83°C ambient; half-power 20 W is supported at 110°C ambient.
  • Operates at 92%, 90% and 88% efficiency, delivering 15 A, 30 A, and 40 A, respectively, to a 1-V load (12 VIN). Designed to uniformly disperse heat from the bottom of the package to the PCB with 144 BGA solder balls, with banks of them assigned to GND, VIN, and VOUT where high current flows.
  • Operates from a 4.7 to 15 V input supply and regulates an output voltage from 0.6 to 3.3 V.
  • Total DC output voltage accuracy is ±3% from –40°C to 125°C.

The LTM4636 costs $38.85 in 1,000-piece quantities.

Source: Linear Technology

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