The Texas Instruments LM4916MM/NOPB is a Class AB audio amplifier from the Boomer® series, designed for portable battery-powered devices where low voltage operation and minimal external parts matter. It delivers 85 mW into an 8 Ω mono speaker and 14 mW per channel into 16 Ω stereo headphones from a single supply rail that runs as low as 900 mV — useful for single-cell alkaline or Li-ion applications near end-of-discharge.
Output power into real loads
Rated at 85 mW into 8 Ω (mono) and 14 mW into 16 Ω (stereo), this amp is sized for headphone drivers and small internal speakers — not for room-filling volume. The 16 Ω stereo output is the spec to check if you are driving typical earbuds or portable headphones; that 14 mW per channel is enough for clear audio at moderate listening levels from a low-voltage rail.
Supply range and battery compatibility
The 900 mV to 2.5 V supply range means this part keeps working as a single alkaline cell drops below 1 V, or from a Li-ion cell that is already near its 3.0 V cutoff after regulation. That sub-1 V minimum is unusual for a Class AB amp and directly extends playback time in battery designs.
Built-in features that simplify the BOM
Depop circuitry suppresses the startup click/pop that otherwise needs external muting transistors or large coupling capacitors. Mute and shutdown pins give software control over audio output and power saving.