The NCP2820 is a cost?effective mono Class?D audio power amplifier capable of delivering 2.65 W of continuous average power to 4.0 from a 5.0 V supply in a Bridge Tied Load （BTL） configuration. Under the same conditions， the output power stage can provide 1.4 W to a 8.0 BTL load with less than 1% THD+N. For cellular handsets or PDAs it offers space and cost savings because no output filter is required when using inductive tranducers. With more than 90% efficiency and very low shutdown current， it increases the lifetime of your battery and drastically lowers the junction temperature. The NCP2820 processes analog inputs with a pulse width modulation technique that lowers output noise and THD when compared to a conventional sigma?delta modulator. The device allows independent gain while summing signals from various audio sources. Thus， in cellular handsets， the earpiece， the loudspeaker and even the melody ringer can be driven with a single NCP2820. Due to its low 42V noise floor， A?weighted， a clean listening is guaranteed no matter the load sensitivity. With zero pop and click noise performance NCP2820A turns on within 1 ms versus 9 ms for NCP2820 version. F