The LM4873 is a dual bridge-connected audio power amplifier
which, when connected to a 5V supply, will deliver 2.1W
to a 4Ω load (Note 1) or 2.4W to a 3Ω load (Note 2) with less
than 1.0% THD+N. In addition, the headphone input pin
allows the amplifiers to operate in single-ended mode when
driving stereo headphones. A MUX control pin allows selection
between the two stereo sets of amplifier inputs. The
MUX control can also be used to select two different
closed-loop responses.