In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

You might consider using an LM2574-5.0V switching regulator. The only external components required are a 330µH inductor, a Shotky Diode, like an SB150, and two elcaps (22µF and 330µF).

The advantage of a switching regulator is its higher efficiency compared to linear regulators. I'm using the LM2574 in many of my applications with good results. Although this is a step-down regulator, I found out that it even keeps the output voltage stable at 5V when the input voltage is below 5V but I did not test, how much current can be drawn in this case.

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