700-W Automotive External Audio Amplifier Reference Design


Design files


This reference design contains a boost converter that provides 36.0-V @ 10.0-A continuous / 20.0-A peak from an input voltage of 9 to 16 V. It contains two premium Class-D audio amplifiers which provide 2x 175-W @ 4-Ω load (left and right channel) and 1x 350-W @ 2-Ω (subwoofer). The design is well suited for automotive audio external amplifier applications due to its thin profile and high-power output.

  • Easily integrated into automotive systems with 50-V load dump and integrated protection system
  • Ultra-HD audio for best quality sound for any integrated Class-D amplifier
  • 100-kHz bandwidth, which enables support for high resolution audio files and formats
  • Low noise, which eliminates "hiss" or "buzz" sounds
Output voltage options PMP11769.1 PMP11769.2 PMP11769.3 PMP11769.4
Vin (Min) (V) 6 35 35 10
Vin (Max) (V) 16 37 37 15
Vout (Nom) (V) 36 12 -12 3.3
Iout (Max) (A) 10 .2 .05 .05
Output Power (W) 360 2.4 .6 .165
Isolated/Non-Isolated Non-Isolated Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC DC DC
Topology Boost Boost- Non Sync Buck Boost- Inverting Linear Regulator

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.


Test results for the reference design, including efficiency graphs, test prerequisites and more


Detailed schematic diagram for design layout and components


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

TIDRNM8.PDF (1072 K)

Detailed overview of design layout for component placement


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


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

TIDRNM9.PDF (1598 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

LM2841-Q1SIMPLE SWITCHER® 42V, 300mA Step-Down DC/DC Regulator in Thin SOT-23

Data sheet document-pdfAcrobat PDF open-in-new HTML
Audio op amps

OPA1662-Q1Automotive Sound Plus, Low-Power, Low-Noise and Distortion, Audio Op Amp

Data sheet document-pdfAcrobat PDF open-in-new HTML
Boost controllers (external switch)

LM25122-Q13-42-V wide VIN, synchronous boost controller with multiphase capability, AEC-Q100 qualified

Data sheet document-pdfAcrobat PDF open-in-new HTML
General-purpose op amps

LM2904-Q1Automotive-grade, dual, 26-V, 700-kHz operational amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML
Speaker amps

TPA3251175-W stereo, 350-W mono, 12- to 38-V supply, analog input Class-D Smart Audio Amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Test report PMP11769 Test Results (Rev. A) Mar. 22, 2017
Technical article Automotive audio from the inside out: more channels, more power, more applications than ever before Oct. 19, 2018
More literature High-Power Audio Amplifiers TPA322x/4x/5x Dec. 01, 2017
Technical article Get loud with a 700W automotive audio amplifier for infotainment systems Jun. 15, 2017
More literature TI Automotive External Amplifiers (Rev. A) Feb. 03, 2017

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