The SIA9255 is a mono digital input Class-D audio amplifier with built-in hardware SITune algorithm and a 7V dynamic boost converter, optimized for efficiently driving high peak power from small speakers. The hardware SITune algorithm includes EQ, MBDRC, OPC, AGL, POSTAGC, static displacement control, and speaker temperature protection.

This Class D amplifier can drive speakers from 4Ω to 8Ω, providing up to 2.7W of output power (8Ω, unclipping).

The integrated speaker current detection function can monitor the speaker in real time, which helps external algorithms protect the speaker from damage.

To avoid popping sounds when muting during a large input signal, you can use soft volume control and the mute function.

The SIA9255 also provides over-temperature protection, thermal foldback, over-current protection, and under-voltage protection to protect the chip.

The SIA9255 can be configured by an external processor via I2C. Up to four SIA9255 devices can share the same bus via I2S/TDM and I2C interfaces.

The chip is packaged in a 22-ball FCQFN package with a 0.4mm pitch, and measures 2.00mm × 2.50mm × 0.55mm. The product can operate over a wide temperature range of -40℃ to +85℃.