The back side of the second camera has the following labels:

S/N: S1337573123

P/N: X861135-001

A/N: 1337-MS2802-09

The front side has a bit more circuitry. Among that circuitry we find:

Texas Instruments TPS54325 - Per the evil geniuses at Chipworks, this is an adaptive on-time D-CAP2™ mode synchronous buck converter.