1.35W mono speaker + stereo headphone in a 2 mm BGA
The LM49153TME/NOPB is a mono audio subsystem from the Boomer and PowerWise series that combines a Class D speaker amplifier and a Class G headphone amplifier in a single 25-WFBGA package measuring 2.01x2.01 mm. It delivers 1.35W into an 8Ω speaker load and 25mW per channel into 32Ω headphones — enough for portable speakers, docking stations, or panel-mount audio on industrial equipment.
Integrated features cut external BOM count
On-chip features include an I²C-controlled volume, an input multiplexer, depop circuitry to suppress click-and-pop on startup, and a shutdown pin — all of which reduce the number of external passives and GPIOs needed. The supply voltage range of 2.7V to 5.5V lets it run directly from a single Li-ion cell or a 5V USB rail without an extra regulator. Differential inputs improve noise rejection in electrically noisy environments like motor drives or switch-mode power supplies nearby.
Active production — no LTB pressure
The NOPB suffix indicates lead-free / RoHS-compliant finish, which is the standard for new builds.
25-BGA layout and rework considerations
The 25-WFBGA package with a 2.01x2.01 mm body demands a fine-pitch stencil and controlled reflow profile — typical for a 0.4 mm or 0.5 mm ball pitch. Surface-mount assembly with no exposed thermal pad means the primary heat path is through the solder balls to the PCB copper planes; a 2-layer board with solid ground pours under the BGA is sufficient for the 1.35W output.