I was reading the LM2734Z datasheet and in the PCB Layout Considerations section, it says "There should be a continuous ground plane on the bottom layer of a two-layer board except under the switching node island." What is it?
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\$\begingroup\$ Link is currently dead: farnell.com/datasheets/85233.pdf In this datasheet it is on page 9, second paragraph. \$\endgroup\$– jippieCommented Jul 10, 2013 at 18:13
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Read a bit more about ground bounce. It's basically the area with your switching supply.
http://www.analog.com/library/analogdialogue/archives/41-06/ground_bounce.html
Basically, a switching supply is a noise machine and a solid ground plane can be a bad idea underneath them. I will let you read more from the Analog website because if I could describe it better than them, I'd be working for them.
