1.4W mono output into 4 Ohm load
The MAX9718BEBL-T: The Class AB topology keeps crossover distortion below the audible threshold at low signal levels, unlike a Class D part that would need an output filter to suppress switching artifacts.
Supply headroom and thermal envelope
Operating from 2.7V to 5.5V, the amplifier runs directly off a lithium-ion cell (3.0V to 4.2V) or a regulated 3.3V/5V rail without an extra boost converter.
9-UCSP footprint and board integration
The mono output is a single-ended BTL (bridge-tied load), so no DC-blocking capacitor is needed on the speaker line.
