TI TPA6404QDKQRQ1

The TPA6404-Q1 device is a four-channel analog-input Class-D audio amplifier with a 2.1MHz PWM switching frequency. It offers a cost-optimized solution in a very small 4.5cm² PCB size. It can operate fully at voltages as low as 4.5V for start-stop events and provides excellent audio quality over an audio bandwidth of up to 100kHz. The TPA6404-Q1 Class-D audio amplifier is excellently designed and suitable for entry-level automotive audio head units, providing analog audio input signals as part of the system design. Compared with traditional linear amplifier solutions, the Class-D topology significantly improves the device efficiency. The output switching frequency is higher than the AM band, which eliminates AM band interference and reduces the size and cost of the output filter. The device is packaged in a 56-pin HSSOP with an exposed thermal pad.

• Advanced load diagnostics
  • AC diagnostics for high-frequency speaker detection with impedance and phase response
  • Integrated sine wave generator
  • Easily meets CISPR25-L5 EMC specifications
  • Automotive-qualified features per AEC-Q100:
    • Device temperature grade 1: ambient operating temperature range –40°C to 125°C
    • Device HBM ESD classification level: 3A
    • Device CDM ESD classification level: C4B
• 4-channel differential analog input
• Four I²C-controlled gain options
• High input impedance for low-value AC coupling
• Four-channel BTL with parallel BTL (PBTL) mode
• Output switching frequency up to 2.1MHz
• 75W output power at 4Ω load, 25V supply voltage, 10% THD
• 45W output power at 2Ω load, 14.4V supply voltage, 10% THD
• 85W output power at 14.4V PBTL, 1Ω load, 10% THD
• Audio performance at 4Ω load, 14.4V, 1kHz: THD+N < 0.01%, 42μV_RMS output noise, –90dB crosstalk
• Load diagnostics: output load open/short detection, output-to-battery or output-to-GND short, line output detection up to 6kΩ
• Operates without input clock
• Output current limiting
• Output short-circuit protection
• 40V load dump
• Accidental open-ground and open-supply
• DC offset voltage
• Overtemperature protection
• 4.5V to 18V supply voltage
• I²C control with 4 address options
• Clip detection and thermal foldback

• Automotive head units
• Automotive external amplifier modules