TFA9873: 8 V Highly Power-Efficient Class-D Audio Amplifier

High output power:

1. 4.5 W (average) into 6 Ω at 4.0 V supply voltage (THD = 1 %)
2. 3.5 W (average) into 8 Ω at 4.0 V supply voltage (THD = 1 %)

Supports handset (16 Ω or 32 Ω) and hands-free (4 Ω to 8 Ω) speaker configurations

High efficiency, low power dissipation, and low-noise speaker driver

Adaptive DC-to-DC converter increases the supply voltage smoothly while switching between fixed boost and adaptive boost modes. It thus, prevents large battery supply spikes and limits the quiescent power consumption

Wide supply voltage range (fully operational from 2.7 V to 5.5 V)

Very low-noise output voltage, 9 μV

Low battery current consumption, 120 mA (Po = 380 mW, average music power)

I2C-bus control interface (400 kHz)

Speaker current and voltage monitoring (through the TDM-bus) for acoustic echo cancellation (AEC) at the host

16 kHz/32 kHz/44.1 kHz/48 kHz sample frequencies supported

Ultrasonic support via TDM running at 96 kHz

Programmable interrupt control via a dedicated interrupt pin

Low RF susceptibility

Thermal foldback and excessive temperature protection