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Demonstration circuit 1341A features LT3757EDD in a 300kHz SEPIC converter circuit, designed for 5V output from a 4.5V to 36V input.


The LT3757EDD operates over an input range of 2.9V to 40V, suitable for applications from single-cell lithium- ion battery portable electronics up to high voltage automotive and industrial power supplies. It also exhibits low shutdown quiescent current of 1µA, making them an ideal fit for battery-operated systems. The IC integrates a high voltage, low dropout linear (LDO) regulator. Thanks to a novel FBX pin architecture, the LT3757EDD can be connected directly to a divider from either the positive output or the negative output to ground. They also pack many popular features such as soft-start, input undervoltage lockout, adjustable frequency and synchronization in a small 10-lead MSOP package or a 3mm × 3mm QFN package.

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