Mono speaker plus stereo headphone output in one 14-TSSOP
The LM4854MT is a Texas Instruments Boomer® Class AB audio amplifier that packs a 2.3W mono speaker channel (into 3.2Ω) and a separate 200mW stereo headphone output (into 16Ω) into a single 14-TSSOP package. This dual-role output architecture means one IC drives both the internal speaker and the headphone jack in a portable device, with the headphone channel bypassing the speaker amplifier's output filter.
2.3W into 3.2Ω — the speaker channel's real-world ceiling
The mono channel delivers 2.3W continuous into a 3.2Ω load — a typical 3-inch speaker in a Bluetooth speaker or portable radio. The 200mW per channel into 16Ω on the headphone side is enough to drive most consumer earbuds to comfortable listening levels without an external headphone amp. Supply voltage spans 2.4V to 5.5V, covering single-cell Li-ion (3.6V nominal) and USB bus power (5V). The lower end at 2.4V means the amplifier keeps playing as the battery discharges, though output power scales down with the rail. Built-in depop circuitry suppresses the audible click when the amplifier powers up or shuts down — a common complaint in portable designs that this part addresses without external mute transistors.
Active production, but watch the RoHS status
The LM4854MT is listed as Active (current production) by Texas Instruments, so it remains a valid BOM line for new and existing designs. The RoHS compliance status is marked as non-compliant — this part contains lead (Pb) above the exemption threshold, which matters for EU RoHS and similar regulations. Confirm your end-market's exemption policy before committing the BOM.