TPA6404-Q1 45-W, 2-MHz analog input 4-channel automotive Class-D audio amplifier |


45-W, 2-MHz analog input 4-channel automotive Class-D audio amplifier


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The TPA6404-Q1 device is a four-channel analog-input Class-D audio amplifier that implements a 2.1 MHz PWM switching frequency that enables a cost optimized solution in a very small 4.5 cm2 PCB size, full operation down to 4.5 V for start/stop events, and exceptional sound quality with up to 100 kHz audio bandwidth.

The TPA6404-Q1 Class-D audio amplifier has an optimal design for use in entry level automotive head units that provide analog audio input signals as part of their 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.


  • Advanced Load Diagnostics
    • AC Diagnostic for Tweeter Detection with Impedance and Phase Response
    • Integrated sine wave Generator
  • Easy to meet CISPR25-L5 EMC specification
  • AEC-Q100 Qualified With the Following Results for Automotive Applications:
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level: 3A
    • Device CDM ESD Classification Level: C4B
  • Audio Inputs
    • 4 Channel Differential Analog Input
    • Four I2C-Controlled Gain Options
    • High Input Impedance for Low Value AC-coupling Capacitor
  • Audio Outputs
    • Four-Channel Bridge-Tied Load (BTL), with Option of Parallel BTL (PBTL)
    • Up to 2.1 MHz Output Switching Frequency
    • 27 W, 10% THD into 4 Ω at 14.4 V
    • 45 W, 10% THD into 2 Ω at 14.4 V
    • 85 W, 10% THD into 1 Ω at 14.4 V PBTL
  • Audio Performance into 4 Ω at 14.4 V, 1 kHz
    • THD+N < 0.01%
    • 42 µVRMS Output Noise
    • - 90 dB Crosstalk
  • Load Diagnostics
    • Output Open and Shorted Load
    • Output-to-Battery or Ground Shorts
    • Line Output Detection Up to 6 kΩ
    • Runs without Input Clocks
  • Protection
    • Output Current Limiting
    • Output Short Protection
    • 40 V Load Dump
    • Fortuitous Open Ground and Power Tolerant
    • DC Offset
    • Over Temperature
    • Undervoltage and Overvoltage
  • General Operation
    • 4.5 V to 18 V supply voltage
    • I2C Control With 4 Address Options
    • Clip Detection and Thermal Foldback

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Part number Order Audio input type Architecture Speaker channels (Max) Power stage supply (Min) (V) Power stage supply (Max) (V) Output power (W) Load (Min) (ohms) SNR (dB) THD + N @ 1 kHz (%) Iq (Typ) (mA) Control interface Closed/open loop Analog supply (Min) (V) Analog supply (Max) (V) Power to parallel bridge tied load (Max) (W) PSRR (dB) Operating temperature range (C) Rating
TPA6404-Q1 Order now Analog Input     Class-D     4     4.5     18     45     2       0.01       I2C     Closed     4.5     18     85     75     -40 to 125     Automotive    
TPA3255-Q1 Samples not available Analog Input     Class-D     4     18     53.5     315     2     112     0.006     34     Hardware     Closed     9.8     11.4     605       -40 to 105     Automotive