1x27W, Digital Input Automotive Audio Amplifier with Current Sense and Real-Time Load Diagnostics

The RTQ9124T-QA is an ultra-low output noise, high-efficiency, mono channel class-D audio power amplifier. It can achieve over 85.5% power efficiency, with an output switching frequency of up to 2.1MHz, enabling a cost-optimized solution in a very small PCB size. The switching frequency can be set either above the AM band, which eliminates AM-band interference and reduces output filter size and cost, or below the AM band to optimize efficiency.The RTQ9124T-QA is fully configurable through the I²C bus interface and includes a comprehensive diagnostics array specifically designed for automotive applications. The built-in anti-pop functions reduce speaker pop noise under all scenarios. Additionally, the built-in protection circuits provide thermal fold-back, over-temperature, overcurrent, overvoltage, and undervoltage protection, and report error status. The RTQ9124T-QA is a 3-wire device that receives all clocks from external sources using standard I²S and TDM (Time-Division Multiplexing) formats. It supports a wide input sampling rate from 8kHz to 192kHz. The RTQ9124T-QA is intended for various automotive audio applications, including telematics and e-call systems. The RTQ9124T-QA is available in a TSSOP-28 (Exposed Pad) package. The recommended junction temperature range is -40°C to 150°C, and the ambient temperature range is -40°C to 125°C.