Audio subsystem in a 30-ball BGA
The Texas Instruments LM49251TLX/NOPB is a stereo audio subsystem that combines a Class D speaker amplifier with a Class G headphone amplifier in a single 30-DSBGA package. It delivers 1.37 W per channel into 8 Ω speakers and 20 mW per channel into 32 Ω headphones, covering both loudspeaker and headphone drive from one IC. The I²C interface handles volume control, shutdown, and depop sequencing — no separate codec or analog pot needed for gain staging.
Supply and temperature range
Supply voltage spans 2.7 V to 5.5 V. Operating temperature range is -40°C to 85°C.
Class D for speakers, Class G for headphones
The Class D speaker path delivers 1.37 W per channel into 8 Ω. The Class G headphone amplifier delivers 20 mW per channel into 32 Ω.
