Buck regulators simplify EMI compliance in rugged applications

February 12, 2018 // By Nick Flaherty
Efficiency vs load current at 5V and 500kHz
Texas Instruments (TI) has introduced two families of wide input voltage synchronous DC-DC buck regulators with a focus on electromagnetic interference (EMI) and thermal performance. 

The highly integrated 5A and 6A LM73605/6 and 2.5A and 3.5A LM76002/3 step-down voltage converters feature an optimised pinout to simplify the process of achieving EMI compliance and higher reliability for rugged industrial and automotive power supplies. The converters provide up to 60V operating input voltage range for nominal 12V, 24V or 48V systems such as remote radio units, ultrasound scanners, motor drives, inverters and servo control units.

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. The 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. 

The small QFN package with wettable flanks delivers a 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 minimizesradiated and conducted emissions.

The regulators offer up to 92 percent full load efficiency at 12V IN, 5V OUT and 500 KHz switching frequency. A 15µA standby quiescent current increases light load efficiency.

The 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.

Offered in a 30-pin, 4 x 6mm WQFN package, the LM73605 and LM73606 are priced in small reels at US$2.93 for 1,000-unit quantities, and theLM76002 and LM76003  are priced at US$2.88. 



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