Automotive 8-Channel Class-D Amplifier with 2.1 MHz Switching Power Supply Reference Design


Design files


TIDA-00733 is a reference design for an eight-channel, Class-D amplifier that is capable of driving 2-Ω loads and an off-battery step-down power supply with 5-V and  3.3-V outputs. The amplifier design provides audio inputs for each audio channel. A  high-performance audio analog-to-digital converter (ADC) creates the digital data stream from the audio inputs and creates the digital timing for the system.

  • Operating voltage range: 4.5V to 18V
  • Withstands transients to 40V
  • 2.1 MHz switching frequency for both power supply and Class D amplifiers
  • 45 watts per channel into 2 ohms at 10% total harmonic distortion plus noise
  • Passes CISPR-25 Class 5 radiated emissions
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUCZ2.PDF (7883 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement

TIDRUR1.ZIP (2228 K)

Files used for 3D models or 2D drawings of IC components

TIDCEA5.ZIP (5557 K)

Design file that contains information on physical board layer of design PCB

TIDRUR0.PDF (3089 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC converters (integrated FET)

LM53635-Q13.5-A, 36-V synchronous, 2.1-MHz, automotive step-down DC-DC converter

Data sheet: PDF | HTML
Audio ADCs

PCM1865-Q1Automotive 110dB 4-Channel Software-Controlled Audio ADC With Universal Front End

Data sheet: PDF | HTML
General-purpose op amps

TLV2462A-Q1Automotive-grade, dual, 6-V, 6.4-MHz, 1.5-mV offset, RRIO operational amplifier

Data sheet: PDF | HTML
Ideal diode/ORing controllers

LM74610-Q10.48-V to 42-V, zero IQ automotive ideal diode controller

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

LP5907-Q1Automotive, 250-mA, low-noise, high-PSRR, ultra-low-dropout voltage regulator with low IQ and enable

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

LP5912-Q1Automotive, 500-mA low-noise low-IQ low-dropout voltage regulator with reverse current protection

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430G2332-EPEnhanced product Mixed Signal Microcontroller

Data sheet: PDF
Noninverting buffers & drivers

SN74LVC125A-Q1Automotive four-channel 1.65V-to-3.6V buffers with 3-state outputs

Data sheet: PDF | HTML
Speaker amps

TAS6424-Q1Automotive, 75-W, 2-MHz, 4-ch, 4.5- to 26.4-V digital input Class-D audio amplifier

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* Design guide Design for Automotive 8-Ch Class-D Amplifier With 2.1-MHz Switching Power Supply Oct. 24, 2017

Related design resources

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Reference designs

TIDA-00743 Automotive 2-MHz Class-D, 4-Channel, 21-W Audio Amplifier in Class AB Form-Factor Reference Design

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