The TFA9871 is a high-efficiency 8.5 V boosted Class-D audio amplifier. It can deliver up to 8 W peak output power into an 8 Ω speaker and up to 10 W peak output power into a 6 Ω speaker, at a supply voltage of 4.0 V. The internal adaptive DC-to-DC converter raises the supply voltage up to 8.5 V, providing ample headroom for major improvements in sound quality.
Internal adaptive DC-to-DC conversion boosts the supply rail to provide additional headroom and power output. The supply voltage is only raised when necessary. This maximizes the output power of the Class-D audio amplifier while limiting quiescent power consumption.
The TFA9871 also comes with battery protection feature. By limiting the supply current when the battery voltage is low, it prevents the audio system from drawing excessive load currents from the battery, which might harm a system under low voltage.
The TFA9871 is available in a 36-bump WLCSP (Wafer Level Chip-Size Package) with a 400 μm pitch.