What makes this voltage regulator special?

I’m working on digesting the data sheet for the Texas Instruments bq34z100-g1 fuel gauge IC. I’m looking to use this chip with a 2 cell lithium polymer battery pack. If using a multi cell pack the data sheet recommends using the following voltage regulator setup. I’m assuming it’s low power but i’m not sure how. I’ve never seen this setup before. What makes it special.

^{simulate this circuit – Schematic created using CircuitLab}