Buck controllers integrate active EMI filter


Optimize the size and EMI of power supply designs with the LM25149-Q1 and LM25149 DC/DC buck controllers from Texas Instruments. Each of these 42V synchronous controllers features an integrated active EMI filter and employs a dual-random spread-spectrum technique to mitigate EMI across multiple frequency bands.

block diagram for the LM25149 buck controller

The LM25149-Q1 is AEC Q100-qualified for automotive use, while the LM25149 targets industrial applications. Both controllers enable engineers to cut the area of the external EMI filter in half, lower the conducted EMI of the power design by as much as 55 dBμV, or achieve a combination of reduced filter size and low EMI. Further, they help reduce conducted EMI across the entire CISPR 25 Class 5 frequency spectrum.

The buck controllers not only allow engineers to meet challenging EMI standards, but also shrink design size by reducing the area and volume of the passive EMI filter. According to the manufacturer, these devices can achieve maximum savings of nearly 50% in area and over 75% in volume of the front-end EMI filter at 440 kHz compared to competing solutions.

Preproduction quantities of the 42V LM25149-Q1 and LM25149 are available now in 3.5×5.5-mm, 24-pin VQFN packages. Prices for the LM25149-Q1 and LM25149 start at $1.42 and $1.20, respectively, in lots of 1000 units. The LM25149-Q1EVM-2100 evaluation module costs $75. Volume production of the controllers is expected in Q4 2021. TI is also working on pin-compatible 80V versions of both devices.

LM25149-Q1 product page

LM25149 product page

Texas Instruments

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