Comparing linear vs. switching regulators

Comparing linear vs. switching regulators

Sometimes only one or the other will work:

Linear regulators are best when low output noise is required.

Linear regulators are best when a fast response to input and output disturbances is required.

Switching regulators are best when power efficiency is critical (such as in portable computers).

Switching regulators are required when the only power supply is a DC voltage, and a higher output voltage is required.

In many cases either one would work. So the choice comes down to which costs less. At high levels of power (above a few watts), switching regulators are cheaper. At low levels of power, linear regulators are cheaper.