700mW into 8Ω — what that means for your speaker load
The TPA321D delivers 700 mW continuous into an 8 Ω load from a single 5 V supply — enough to drive a small speaker or earpiece in a portable device without an external boost converter. The Class AB output stage keeps crossover distortion low at low signal levels, so the audio quality holds up at the quiet passages, not just at full output.
Protection and shutdown features
On-chip short-circuit and thermal protection prevent damage if the output is accidentally shorted or the die overheats — the amplifier shuts down and recovers when the fault clears. A dedicated shutdown pin lets a microcontroller or GPIO put the output into a high-impedance state, cutting supply current to near zero during system sleep.