45-W, 2.1-MHz analog input 4-channel automotive Class-D Burr-Brown™ audio amplifier


Product details


Audio input type Analog Input Architecture Class-D Speaker channels (Max) 4 Power stage supply (Max) (V) 18 Power stage supply (Min) (V) 4.5 Load (Min) (ohms) 2 Output power (W) 45 THD + N @ 1 kHz (%) 0.09 Iq (Typ) (mA) 175 Control interface I2C Closed/open loop Closed Analog supply (Min) (V) 4.5 Analog supply (Max) (V) 18 Sampling rate (Max) (kHz) 96 PSRR (dB) 75 Operating temperature range (C) -40 to 125 open-in-new Find other Speaker amps

Package | Pins | Size

HTSSOP (DDV) 44 113 mm² 14 x 8.1 open-in-new Find other Speaker amps


  • Highest efficiency Class-D
    • Significantly more efficient than Class-AB
    • Reduce thermal solution with 75% less heat dissipation than Class-AB
  • Start/stop operation down to 4.5 V
  • AEC-Q100 Qualified for automotive applications:
    • Temperature grade 1: –40°C to 125°C TA
    • HBM ESD Classification level 2
    • CDM ESD Classification level C2B
  • 27 W, 10% THD into 4 Ω at 14.4 V
    • Drives 4 Ω and 2 Ω loads
  • Load diagnostics
    • Output open, shorted load
    • Output-to-battery or ground shorts
    • Tweeter connected
  • Designed with advanced gate drive to meet CISPR25-L5 EMC specification
    • Class-D at 2.1 MHz, no AM interference
    • Spread Spectrum mode, Phase Offset, Slew Rate Control
  • Protection
    • 40 V Load dump
    • Output short protection
    • DC offset and over temperature
    • Fortuitous open ground and power tolerant
  • Audio inputs
    • 4 Channel single-ended analog input
    • 10 dB, 16 dB, 22 dB or 28 dB Gain option
  • Supports parallel channel drive (PBTL)
  • Audio performance into 4 Ω at 14.4 V, 1 kHz
    • THD+N < 0.006%
    • 42 µVRMS Output Noise
    • 80 dB PSRR
    • Efficiency > 80%
  • Special features
    • Programmable clip detection
    • Load current limiter
    • Thermal gain foldback
    • Fast and autonomous startup diagnostics
    • AC load impedance measurement with < 10 mA load current

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The TPA6304-Q1 device is a four-channel analog-input Class-D Burr-Brown™ audio amplifier that implements a 2.1 MHz PWM switching frequency that enables a cost optimized solution in a very small 2.7 cm2 PCB size, high impedance single ended inputs and full operation down to 4.5 V for start/stop events.

The TPA6304-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 can be set either above the AM band, which eliminates the AM band interference and reduces output filter size and cost, or below AM band to further optimize efficiency.

The device is offered in a 44 pin HTSSOP package with the exposed thermal pad up.

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Technical documentation

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Type Title Date
* Data sheet TPA6304-Q1 45-W,​​​ 2.1-MHz Analog Input 4-Channel Automotive Class-D Burr-Brown datasheet (Rev. B) Dec. 11, 2020
Application note Understanding Thermal Capabilities of Automotive Class-D Amplifiers (Rev. A) Jun. 08, 2021
User guide TPA6304-Q1 Evaluation Module (Rev. A) Oct. 14, 2020
Technical article Concerned about transitioning from Class-AB to a Class-D? Well, you shouldn’t be. Oct. 10, 2019
White paper Automotive Audio Design Considerations to Minimize Amplifier Size & Thermal Load Oct. 09, 2019
Application note Diagnostics and Protections in Automotive Audio Systems (Rev. A) Sep. 24, 2019
Application note Inductor Selection Guide for 2.1 MHz Class-D Amplifiers (Rev. A) Sep. 05, 2019

Design & development

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Hardware development

document-generic User guide
The TPA6304-Q1 evaluation module showcases the industry's smallest 2.1-MHz 4-channel Analog Input Class-D Audio solution for Automotive Infotainment applications. TPA6304-Q1’s 2.1-MHz switching frequency allows customers to significantly reduce inductor size and cost and optimize total system (...)
  • 2.1-Mhz switching frequency
  • 4-channel Analog input Class-D automotive audio amplifier
  • 27-W/Ch at 10% THD+N into 4-Ω with a 14.4-V supply
  • 45-W/Ch at 10% THD+N into 2-Ω with a 14.4-V supply
  • I2C diagnostics and protection

Design tools & simulation

PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SLAR166.ZIP (66 KB)

Reference designs

Automotive domain controller for gateway, assisted and automated driving systems reference design
TIDEP-01020 Decentralized vehicle architectures on the road today use individual ECUs that lack processing power and high-speed interfaces to handle the complex tasks and data movement needs of newly emerging automotive architectures. Higher level functions require the right combination of DMIPS, data bandwidth (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

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HTSSOP (DDV) 44 View options

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