The Texas Instruments LM4809MMX/NOPB is a Boomer® series Class AB stereo headphone amplifier in an 8-VSSOP package. The Class AB topology keeps crossover distortion low while maintaining reasonable efficiency for a linear stage.
Key features for the BOM decision
Built-in Depop circuitry suppresses power-up and shutdown transients that would otherwise thump the headphones. A dedicated Shutdown pin lets a system controller cut supply current to near zero when audio is idle. Thermal Protection prevents die damage under sustained overload or a shorted output — useful in a field-replaceable module where the end user might plug in mismatched headphones.
ROHS3 compliant, so it passes into EU and RoHS-restricted markets without exemption paperwork.