Texas Instruments (TI) today introduced two wide-Vin synchronous SIMPLE SWITCHER® dc-dc buck regulators in ultra-small HotRod™ quad flat no-lead (QFN) packaging. The highly integrated 3-A LMR33630 and 2-A LMR33620 step-down voltage converters feature the industry’s best full load efficiency – 92 percent – for rugged and reliable industrial power supplies with switching frequencies up to 2.1MHz.
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 3A 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.
Features and benefits of the LMR33630 and LMR33620
- The new dc-dc converters provide an operating input voltage range as high as 36V for nominal 12-V or 24-V systems such as factory and home automation, motor drives, inverters and servo control units.
- The 36-V regulators feature full load efficiency of 92 percent at 24 Vin, 5 Vout and a 400-kHz switching frequency.
- These regulators have a 24µA typical standby quiescent current.
- In addition to the QFN package, the 36-V 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.
Packaging, pricing and availability
Available through the TI store and authorized distributors, the 36-V LMR33630 and LMR33620 are priced in small reels at US$1.86 and US$1.75, respectively, for 1,000-unit quantities. The 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 US$1.62 and US$1.52, respectively, in 1,000-unit quantities.