features such as soft-start, adjustable frequency, synchronization and a wide input range into a small footprint. The LT3580 comes in an 8-pin 3mm 3mm DFN or MSOP packages and can be used in multiple con gurations such as boost, SEPIC, yback and Cuk topologies.Sensing Output Voltage Has Never Been EasierThe LT3580 has a novel FB pin architecture that simpli-Namely, there are two internal error ampli ers; one senses positive outputs and the other negative. Additionally, the LT3580 has integrated the ground side feedback resistor to minimize component count. To illustrate the bene ts, notice how the schematics in Figures 1, 3 and 5 need only one feedback resistor. A single sense resistor simply connects to the FB pin on one side and to the output on the other regardless of the output polarity, eliminating the confusion associated with positive or negative output sensing and simplifying the board layout. A user decides the output polarity he needs, the topology he wants to use and the LT3 Single Resistor Sets Positive or Negative Output f Design Note