DC/DC buck regulators simplify process of achieving EMI compliance

12th February 2018
Lanna Cooper

Two families of wide-VIN synchronous DC/DC buck regulators with ElectroMagnetic Interference (EMI) and thermal performance have been announced by Texas Instruments. The highly integrated 5A and 6A LM73605/6 and 2.5A and 3.5A LM76002/3 step-down voltage converters feature an optimised pinout and thermal co-efficient to simplify the process of achieving EMI compliance and higher reliability for rugged industrial and automotive power supplies.

The 3.5-36V LM73605/6 and 3.5-60V 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 optimise efficiency.

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.

Optimised package pin placement allows flexibility in board design to improve heat sinking, which minimises radiated and conducted emissions.

Key features and benefits of the LM73605/6 and LM76002/3

  • The new DC/DC converters provide up to 60V operating input voltage range for nominal 12, 24 or 48V systems such as remote radio units, ultrasound scanners, motor drives, inverters and servo control units.
  • The new regulators offer up to 92% full load efficiency at 12 VIN, 5 VOUT and 500 KHz switching frequency. Very low 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.

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