22-W Mono Automotive Digital Audio Amplifier With Load Dump and I2C Diagnostics

22-W Mono Automotive Digital Audio Amplifier With Load Dump and I2C Diagnostics - TAS5421-Q1


The TAS5421-Q1 is a mono digital audio amplifier, ideal for use in automotive emergency call (eCall), telematics, instrument cluster, and infotainment applications. The device provides up to 22 W into 4 Ω at less than 10% THD+N from a 14.4-Vdc automotive battery. The wide operating voltage range and excellent efficiency make the device ideal for start-stop support or running from a backup battery when required. The integrated load-dump protection reduces external voltage clamp cost and size, and the onboard load diagnostics report the status of the speaker through I2C.

For all available packages, see the orderable addendum at the end of the datasheet.


  • Mono BTL Digital Power Amplifier
  • 22-W Output Power at 10% THD+N into 4 Ω
  • 4.5-V to 18-V Operating Range
  • 85% Efficiency into 4 Ω
  • Differential Analog Input
  • Speaker Guard™ Speaker Protection with Adjustable Power Limiter
  • 75-dB Power-Supply Rejection Ratio (PSRR)
  • Load Diagnostic Functions:
    • Open and Shorted Output Load
    • Output-to-Power and Output-to-Ground Shorts
  • Protection and Monitoring Functions:
    • Short-Circuit Protection
    • 40-V Load Dump Protection per ISO-7637-2
    • Output DC Level Detection while Music is Playing
    • Overtemperature Protection
    • Overvoltage and Undervoltage Protection
  • Thermally Enhanced 16-Pin HTSSOP (PWP) Package with PowerPAD Package (Pad Down)
  • Designed for Automotive EMC Requirements
  • Qualified According to AEC-Q100 Grade 2
  • ISO9000: 2002 TS16949 Certified
  • –40°C to 125°C Ambient Temperature Range

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Parametrics Compare all products in Speaker Amps

Audio Input Type
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 (V) (Min)
Analog Supply (V) (Max)
Sampling Rate (Max) (kHz)
Operating Temperature Range (C)
TAS5421-Q1 TAS5411-Q1 TPA3111D1-Q1 TPA3112D1-Q1
Analog Input    Analog Input    Analog Input    Analog Input   
Class-D    Class-D    Class-D    Class-D   
Mono    Mono    Mono    Mono   
4.5    4.5    8    8   
18    18    26    26   
22    8      25   
2    2    4    4   
    102    102   
0.05    0.05    0.05    0.05   
16    16    40    40   
I2C    I2C    Hardware    Hardware   
Closed    Closed    Closed    Closed   
4.5    4.5    26    8   
18    18    8    26   
75    75    70    70   
-40 to 125    -40 to 125    -40 to 125    -40 to 125   
Automotive    Automotive    Automotive    Automotive