I had to do a lot of searching because although I have a simple goal, I also have restrictions.
My restrictions are that I am looking for the least external components, TSSOP or QFN is out of the way for now so that took a big chunk out of the choices I had.
I came up with
TPA3122D2
and will supply with 12V and use a set of 8Ω speakers.
Now, don't laugh but this is my analysis:
Looking at the datasheet;
Based on fig 6, I should get 0.1% THD+n (which appears to be very good)
Based on fig 12, I should get 2W (not sure if it is per channel or total)
Based on fig 14, I get close to 80% efficiency (which appears to be very good)
Based on fig 16, It should require about 150mA
What I am unsure of is all of these graphs are based on a gain of 20dB but the chip can be configured as up to 36dB so I am wondering how much this difference is affecting the values. by 80% ?
Another question I have is my understanding is volume level = output power so I am thinking if this chip generates 2W (based on my values) of output power, it should make the sound level much louder than the LM386 however the LM386 has a gain of 200dB while this chip has 36dB... this is unclear to me.