There’s 2 different assembly vendors for this part (UTL & ATP). Internally their frames are different, but the die and the wire bonding to the frame are the same.
UTL uses the chamfer on the package…
The Cout equation in the MAX16833 datasheet and in Application Note 5571 is functionally the same. The difference lies in the definition used for the output voltage ripple Voutripple. The MAX16833 datasheet…