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The device can be easily used with any processor through the I2S output, and can achieve stereo sound when using two TAS2557 devices. The device can be individually debugged for different speakers, which allows customers to add product value while maintaining the original form factor design. In addition, no matter in which operating mode, TAS2557 can independently debug voice and audio with 15.9µV ultra-low ICN, which makes the realization of receiver / speaker possible.
The class H boost converter generates a class D amplifier power rail. If the audio signal requires only a low class D output power, the boost converter will improve system efficiency by disabling VBAT and connecting it directly to the class D amplifier power supply. When higher audio output power is required, the multi-stage boost function will quickly activate signal tracking to provide additional voltage to the load. 
characteristic
The TAS2557 device is an advanced class D audio amplifier and a complete set of system-on-chip (SoC). The device has an ultra-low noise audio DAC and a Class D power amplifier with speaker voltage and current sensing feedback. The on-chip low-latency DSP supports Texas Instruments' TI's SmartAmp speaker protection algorithm, which maximizes speaker volume while maintaining the speaker in a safe state.
Ultra-low noise, mono boost Class-D amplifier with 4Ω load and 4.2V supply voltage, 5.7W at 1% THD + N, 6.9W at 8% THD + N at 8Ω Under load and 4.2V supply voltage, the power at THD + N is 1% is 3.8W, and the power at THD + N is 10% is 4.5W Digital-to-analog converter (DAC) + Class D amplifier output noise (ICN ) 15.9µV 1% THD + N / 8Ω DAC + Class D amplifier signal-to-noise ratio (SNR) is 111dB 1W / 8Ω THD + N is –90dB (with flat frequency response) Post filter Feedback (PFFB) When the frequency is 217Hz, the power supply rejection ratio (PSRR) of the 200 mVpp ripple voltage is 110dB. The input sampling rate range is 8kHz to 96kHz. Built-in speaker sensing measures speaker current and voltage measurement VBAT voltage and chip temperature through a dedicated real-time Dual-core digital signal processor (DSP) provides speaker protection heat and offset protection to detect speaker leakage and damage. Efficient Class H boost converter with multi-level tracking function. The efficiency is 86% at 500mW, 8Ω, 3.6V VBAT The efficiency is 700% at 700mW, 8Ω, 4.2V VBAT Benefit control (AGC) limit battery current consumption adjustable D-type switch edge rate control overheat protection, short circuit protection and undervoltage protection I2S, left-justified, right-justified, DSP and TDM input and output interfaces, I2C or string for register control Line Peripheral Interface (SPI) can use two TAS2557 devices to achieve stereo configuration power boost input: 2.9V to 5.5V analog / digital: 1.65V to 1.95V digital I / O: 1.62V to 3.6V 42 solder balls, pitch DSBGA Package Data Sheet for 0.5mm
TAS2557 5.7WD Class Mono Audio Amplifier with Class H Boost and Speaker Sensing Data Sheet (Rev. A)