LM2575 – Buck Adjustable Switching Regulator

The buck-boost regulator circuit delivers -5V output. I hoped this would a nice way to generate a negative voltage for e.g. an LCD-display. However this circuit requires component values that are similar to the buck regulator at high load.

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LM2575 – Step-Down Adjustable Voltage Switching Regulator with Output Enable

The LM2575 represents a superior alternative to  popular three-terminal linear regulators. Due to its
high efficiency, it significantly reduces the size of the heat sink.nn

The device also offers internal frequency compensation, a fixed-frequency oscillator, cycle-by-cycle current limiting, and thermal shutdown.