The AX5689C is a 4-channel bridge-tied load (BTL) audio amplifier controller IC with digital inputs and CMOS-level pulse-width modulation (PWM) outputs. The device enables high-order digital control loops with feedback for Class-D output filters.

Embedded low-latency analog-to-digital converters (ADCs) are used to close the loop behind the output filter in the digital domain. The digital control loop has a high loop gain for all audio frequencies. The AX5689C suppresses all errors caused by the power supply, power stage, and output filter within the audio band (20Hz to 20kHz). It can achieve superb performance levels while enabling lower-cost options.

The low-latency ADCs, PWM outputs, and configurable interconnects allow for custom configurations, including analog audio inputs, analog line outputs, power supply control, current-sensing, temperature-sensing, and more. 

The AX5688C is compatible with power stages from various vendors, and can read and respond to power stage diagnostic signals. The maximum output power (P_OUT) is dependent on the user application and is scalable based on the number of channels, selected power stages, loads, and supply.

The AX5689C is available in a QFN-64 (9mmx9mm) package.