DC/DC Converters Keep A Thumb On EMI And Temperature

Texas Instruments’ latest two families of wide-VIN synchronous dc/dc buck regulators are said to deliver industry-leading electromagnetic interference (EMI) and thermal performance. The 5A and 6A LM73605/6 and 2.5A and 3.5A LM76002/3 step-down voltage converters feature an optimized pinout and best-in-class thermal coefficient to simplify the process of achieving EMI compliance and higher reliability for rugged industrial and automotive power supplies.

 

The 3.5V to 36V LM73605/6 and 3.5V to 60V LM76002/3 buck regulators meet and exceed the demanding CISPR 25 Class 5 automotive electromagnetic compatibility (EMC) requirements. These regulators' programmable output switching frequency can be set either above the AM band, which eliminates AM-band interference and reduces output filter size and cost, or below the AM band to optimize efficiency.  

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The small QFN package with wettable flanks delivers an ultra-low thermal coefficient of 7.1ºC/W (ΨJB) to improve reliability and enables post-solder optical inspection to simplify manufacturing. Optimized package pin placement allows flexibility in board design to improve heat sinking, which minimizes radiated and conducted emissions. Watch the video to learn how to leverage TI's online toolbox to tackle thermals.

 

LM73605/6 and LM76002/3 Features

•Up to 60-V operating input voltage range for nominal 12-V, 24-V or 48-V systems such as remote radio units, ultrasound scanners, motor drives, inverters and servo control units.

•Up to 92% full load efficiency at 12 VIN, 5 VOUT and 500 kHz switching frequency. A 15-µA standby quiescent current increases light load efficiency.

•Automotive-grade LM76002-Q1, LM76003-Q1, LM73605-Q1 and LM73606-Q1 support compact automotive applications such as the infotainment head unit and front/surround-view cameras used for autonomous driving.

 

Availability

 

Offered in a 30-pin, 4 mm x 6 mm WQFN package, the LM73605 and LM73606 are priced in small reels at $2.93 each/1,000 quantities, and the LM76002 and LM76003 are priced at $2.88 each/1,000. For further enlightenments, watch videos on how to tackle EMI and to deal with thermals. Of course, datasheets abound.