In summary, the LT3757 and LT3758 are highly versatile DC/DC controllers that can be designed into boost, flyback, SEPIC, and inverting power supply topologies. Also, these unique parts have two internal voltage feedback amplifiers and reference voltages, which allow them to regulate a positive or negative output voltage. Additionally, both parts have a programmable fixed or synchronizable operating frequency which allows designers to choose from a wide range of inductors and capacitors to optimize size, performance, and cost.