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The RTQ9128 is an ultra-low output noise, high- efficiency, four-channel class-D audio power amplifier. It delivers 4x27W into 4Ω at 10% THD+N from a 14.4V supply in automotive applications.It can achieve over 87% power efficiency with an output switching frequency of up to 2.1MHz for clarity, which enables a cost-optimized solution in a very small PCB size. Additionally, the RTQ9128 can be set either above the AM band, which eliminates the AM-band interference and reduces output filter size and cost, or below the AM band to optimize efficiency.The RTQ9128 is fully configurable through the I<SUP>2</SUP>C bus interface and features comprehensive diagnostics array specially designed for automotive applications.The built-in anti-pop functions can reduce the speaker’s pop noise under all kinds of scenarios. Its built-in protection circuits provide thermal fold-back, over-temperature, overcurrent, overvoltage, and undervoltage protections and report error status.The RTQ9128 is a 3-wire device that receives all clocks from external sources with standard I<SUP>2</SUP>S and TDM (Time-Division Multiplexing) formats. It supports a wide range of input sampling rates from 32kHz to 96kHz. The device is offered in a 64-pin RLQFP package with the exposed thermal pad facing up.The recommended junction temperature range is -40°C to 150°C, and the ambient temperature range is -40°C to 125°C.
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<div class="spec-list"><ul class="lv1"><li>AEC-Q100 Grade 1 Qualified </li><li>I<sup>2</sup>S and TDM Input </li><li>4x22W, THD + N = 1%, 4Ω, 14.4V </li><li>4x27W, THD + N = 10%, 4Ω, 14.4V </li><li>4x45W, THD + N = 10%, 2Ω, 14.4V </li><li>THD + N is 0.03% </li><li>SNR up to 115dB </li><li>Ultra-Low Quiescent Current Mode </li><li>Ultra-Low Noise = 18μV </li><li>Low R<sub>DS_ON</sub> (80mΩ) </li><li>Switching Frequency up to 2.1MHz </li><li>Sampling Frequency from 32kHz to 96kHz </li><li>I<sup>2</sup>C Control with 16 Address Options </li><li>Built-In Anti-Pop Function </li><li>Built-In Thermal Fold-Back and Clip Detection </li><li>Load Diagnostics <ul class="lv2"> <li></li><li>Output Open Load and Short Load </li><li>Output Short to Ground or Power </li><li>DC and AC Coupled Load Detection </li></ul> </li><li>Protection Features <ul class="lv2"> <li></li><li>Output Short-Circuit </li><li>Overvoltage and Undervoltage </li><li>Overcurrent Warning and Protection </li><li>Over-Temperature </li><li>DC Offset Detection </li><li>40V Load Dump </li></ul> </li><li>Ambient Temperature Range: -40°C to 125°C </li><li>Junction Temperature Range:-40°C to 150°C </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>Automotive Head Units </li><li>In-Vehicle Infotainment </li><li>Automotive External Amplifier Modules </li></ul></div>
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