Synchronous Converters Simplify Industrial Power Supply Design

Texas Instruments (TI) unveils two wide-VIN synchronous SIMPLE SWITCHER dc/dc buck regulators in ultra-small HotRod quad flat no-lead (QFN) packaging. According to TI, the 3-A LMR33630 and 2-A LMR33620 step-down voltage converters feature the industry's best full load efficiency – 92% – for rugged and reliable industrial power supplies with switching frequencies up to 2.1 MHz. Used in conjunction with TI's WEBENCH® Power Designer, the converters simplify power conversion and speed the design process.

 

The 3.8-V to 36-V LMR33630 and LMR33620 buck regulators are offered in 3-mm-by-2-mm thermally enhanced packaging. The small HotRod QFN package includes unique wettable flanks enabling post-solder optical inspection to simplify manufacturing and gives the LMR33630 the industry's highest 0.5A/mm2 power density at 3 A of current. Optimized package construction and symmetrical pin placement minimizes parasitic inductance and facilitate optimal placement of input bypass capacitors to mitigate conducted and radiated noise emissions. Watch the video, "Reduce EMI and shrink solution size with HotRod packaging."

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LMR33630 and LMR33620 features include:

  • an operating input voltage range as high as 36 V for nominal 12-V or 24-V systems such as factory and home automation, motor drives, inverters and servo control units. For applications up to 60 V, TI offers the 600-mA LMR36006 and 1.5-A LMR36015 synchronous step-down converters in pin-compatible packages.
  • full load efficiency of 92 percent at 24 VIN, 5 VOUT and a 400-kHz switching frequency. Very low 24-µA typical standby quiescent current increases light load efficiency.
  • the regulators are also available in a thermally efficient, 8-pin, 5-mm-by-6-mm small-outline integrated circuit (SOIC) package that delivers an ultra-low thermal coefficient of 13.8ºC/W (ΨJB) to further improve reliability.  

The 36-V LMR33630 and LMR33620 are priced in small reels at $1.86 and $1.75, respectively, each/1,000. The 60-V LMR36015 and LMR36006 are priced in small reels at $1.84 and $1.61, respectively, each/1,000. All four devices are available in the 12-pin HotRod package. Available in the 8-pin SOIC package, the 36-V LMR33630 and LMR33620 are priced in small reels at $1.62 and $1.52, respectively, each/1,000.

 

For more details, watch the video, "Trade-offs between thermal performance and small solution size with DC/DC converters”, and checkout the product page and the datasheet.