Power regulators feature industry-leading EMI and thermal performance

Texas Instruments (TI) has introduced two families of wide-VIN synchronous DC/DC buck regulators with what the company says is industry-leading electromagnetic interference (EMI) and thermal performance.

Highly integrated the 5-A and 6-A LM73605/6 and 2.5-A and 3.5-A LM76002/3 step-down voltage converters feature an optimised pinout and best-in-class thermal coefficient and are intended to simplify the process of achieving EMI compliance and higher reliability for rugged industrial and automotive power supplies.

The 3.5-V to 36-V LM73605/6 and 3.5-V to 60-V LM76002/3 buck regulators meet and exceed the CISPR 25 Class 5 automotive electromagnetic compatibility (EMC) requirements. The 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.

An optimised package pin placement brings greater flexibility in board design to improve heat sinking, which reduces radiated and conducted emissions.

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

• Providing 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.

• Offer up to 92 percent full load efficiency at 12 VIN, 5 VOUT and 500 KHz switching frequency. Very low 15-µA 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.

Neil Tyler