What the 125 mW output power means for your headphone load
Rated 125 mW per channel into a 32 Ω load, the MAX97220EETE+T delivers enough voltage swing and current to drive most portable headphones to comfortable listening levels — 125 mW into 32 Ω corresponds to about 2 V RMS, which is roughly 110 dB SPL from typical 32 Ω headphones with 100 dB/mW sensitivity.
Class AB topology vs switching alternatives
As a Class AB amplifier, the MAX97220EETE+T operates its output stage in the linear region across the entire signal swing — this avoids the crossover distortion of Class B and the switching noise of Class D, at the cost of higher quiescent current. For battery-powered portable audio where THD+N below 0.01% is required, Class AB remains the preferred architecture.
Package and thermal interface for layout
The 3×3 mm footprint fits tight layouts in USB dongles, portable media players, or active noise-cancelling headphone circuits.