Analog input four-channel Class-D audio amplifier offers cost-optimisation in a tiny size

The Texas Instruments TPA6404-Q1 device is a four-channel analog-input Class-D audio amplifier that implements a 2.1MHz PWM switching frequency that enables a cost-optimised solution in a tiny 4.5cm2 PCB size, full operation down to 4.5V for start/stop events, and exceptional sound quality with up to 100kHz audio bandwidth. The amplifier has an optimal design for use in entry-level automotive head units that produce analog audio input signals as part of the system design. The Class-D topology dramatically improves efficiency over traditional linear amplifier solutions. The output switching frequency operates above the AM band, which eliminates the AM band interference and reduces the output filter size and cost. The device is offered in a 56-pin HSSOP package with the exposed thermal pad up.