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Small Size and Very High Efficiency Buck-Boost Converter - LTC3780

Henry Zhang - Applications Engineering Manager - Power Products Jun 15th 2009

Many applications such as battery-powered supply have a wide input voltage that can be lower or higher than the regulated output voltage. The conventional solutions, such as flyback, Sepic or a 2-stage supply are usually complicated and inefficient. The single-stage buck-boost converter only needs a small size inductor with good efficiency. With the LTC3780, the synchronous buck-boost converter can offer an impressive 8% to 10% efficiency gain over a typical flyback or Sepic solution. Furthermore, the 4-switch synchronous buck-boost converter can be integrated in a very small 15mm x 15mm x 3mm, 60W, LTM4605/7/9 power module with a single external inductor. With current mode control, the LTM460x modules can be easily paralleled for more current and power with good current sharing and thermal balance.

Small Size and Very High Efficiency Buck-Boost Converter - LTC3780