Class AB mono amplifier with integrated headphone drive and volume control
The Texas Instruments LM4865MM is a Boomer® series Class AB audio amplifier delivering 1W into an 8Ω speaker from a single 2.7V to 5.5V supply, plus a separate 110mW output into 32Ω headphones — both from the same mono channel. The 8-VSSOP package (3.00 mm width) and surface-mount footprint suit portable or space-constrained PCB layouts where a single amplifier drives both a small speaker and a headset jack.
Output power and load matching
Rated 1W continuous into an 8Ω load and 110mW into 32Ω — the 8Ω figure covers typical small speakers in battery-powered devices, while the 32Ω rating matches standard consumer headphones without an external headphone amplifier. The 2.7V to 5.5V supply range means the amplifier runs from a single Li-ion cell (3.6V nominal) or a regulated 3.3V/5V rail, with output power scaling proportionally with supply voltage.
Integrated control and protection features
On-chip depop circuitry suppresses the audible pop on power-up and shutdown transitions — a common issue in single-supply audio paths that otherwise requires external muting FETs or timing circuits. The volume control pin accepts a DC voltage to adjust gain, eliminating a mechanical potentiometer from the signal path. Thermal protection and shutdown logic are integrated, reducing external component count.
Temperature grade and operating environment
Rated for -40°C to +85°C ambient (TA), covering industrial and extended-commercial temperature ranges — suitable for outdoor IoT audio endpoints, automotive cabin modules (non-safety), and portable test equipment.
Lifecycle and procurement posture
Sourced through independent distribution channels; availability and current pricing are confirmed at RFQ against the buyer's required quantity. No pin-compatible direct replacement is recorded from TI for this order code.