The MAX9723CEBE+ is a Class AB stereo headphone amplifier from Analog Devices, delivering 60 mW per channel into a 16 Ω load. It operates from a 1.8 V to 3.6 V supply and is rated over the -40°C to +85°C industrial temperature range.
The 60 mW x 2 into 16 Ω output is the headline rating.
Package and footprint — what to expect
The 2.02 x 2.02 mm UCSP is a fine-pitch BGA with no leads — the solder balls are the terminations. Surface-mount assembly requires a solder-paste stencil and reflow profile.