Small and efficient synchronous converters

Texas Instruments has introduced two wide-VIN synchronous SIMPLE SWITCHER DC-DC buck regulators in ultra-small HotRod QFN packaging. The highly integrated 3A LMR33630 and 2A LMR33620 step-down voltage converters offer what is claimed to be the industry’s best full load efficiency – 92% – for hardy and reliable industrial power supplies with switching frequencies up to 2.1MHz. Used together with the company's WEBENCH Power Designer, the converters simplify power conversion and expedite the design process. The 3.8V to 36V buck regulators are offered in 3mm x 2mm thermally enhanced packaging. The small HotRod QFN package includes unique wettable flanks offering post-solder optical inspection to simplify manufacturing and gives the LMR33630 what is claimed to be the industry’s highest 0.5A/mm2 power density at 3A of current. Optimized package construction and symmetrical pin placement reduces parasitic inductance and facilitate optimal placement of input bypass capacitors to mitigate conducted and radiated noise emissions.