700-W Automotive External Audio Amplifier Reference Design
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.

Description & Features

Technical documentation

Support & Training

Order Now

See the Important Notice and Disclaimer covering reference designs and other TI resources.

Key Document


The PMP11769 reference design is a complete solution for a 700W automotive external amp. The boost converter provides 36.0V @ 10.0A continuous / 20.0A peak from an input voltage of 9-16V. It contains two premium Class-D audio amplifiers, which provide 2x 175W @ 4-Ω load (left & right channel) and 1x 350W @ 2-Ω (subwoofer).The design is well suited for car audio external amp applications due to its thin profile and high power output.

  • Easily integrated into automotive systems with 50V load dump and integrated protection system
  • Ultra-HD audio for best quality sound for any integrated Class-D amplifier
  • 100kHz bandwidth, which enables support for high resolution audio files and formats
  • Low noise, which eliminates the "hiss" or "buzz" sounds

See the Important Notice and Disclaimer covering reference designs and other TI resources.


Schematic/Block Diagram

Quickly understand overall system functionality.

Download Schematic

Design Guide

Get results faster with test and simulation data that's been verified.

Download Design Guide

Design Files

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

Download Design Files

(Output Voltage 1)
(Output Voltage 2)
(Output Voltage 3)
(Output Voltage 4)
Vin (Min) (V)6353510
Vin (Max) (V)16373715
Vout (Nom) (V)3612-123.3
Iout (Max) (A)
Output Power (W)3602.4.6.165
TopologyBoostBoost- Non SyncBuck Boost- InvertingLinear Regulator

TI Devices (5)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM25122-Q1  3-42-V wide VIN, synchronous boost controller with multiphase capability, AEC-Q100 qualified  Step-up (boost) regulators  Sample & Buy Not Available
LM2841-Q1  SIMPLE SWITCHER® 42V, 300mA Step-Down DC/DC Regulator in Thin SOT-23  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
LM2904-Q1  Automotive Catalog Dual Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
OPA1662-Q1  Automotive Sound Plus, Low-Power, Low-Noise and Distortion, Audio Op Amp  Operational amplifiers (op amps)  Sample & Buy Not Available
TPA3251  175-W stereo, 350-W mono, 12- to 38-V supply, analog input Class-D Smart Audio Amplifier  Audio amplifiers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM25122-Q1 Download
LM2841-Q1 Download
LM2904-Q1 Download Download
Download Download
OPA1662-Q1 Download
TPA3251 Download Download

Texas Instruments and Accelerated Designs, Inc. have collaborated together to provide TI customers with schematic symbols and PCB layout footprints for TI products.

Step 1: Download and install the free download.

Step 2: Download the Symbol and Footprint from the CAD.bxl file table.

Technical documentation

See the Important Notice and Disclaimer covering reference designs and other TI resources.

User guide (1)
Title Type Size (KB) Date
PDF 1600 22 Mar 2017
Design files (6)
Title Type Size (KB) Date
ZIP 5115 21 Feb 2017
PDF 1486 21 Feb 2017
PDF 58 23 Nov 2016
ZIP 218 26 Sep 2016
PDF 1598 26 Sep 2016
PDF 1072 26 Sep 2016
More literature (2)
Title Type Size (KB) Date
PDF 2960 01 Dec 2017
PDF 1255 03 Feb 2017

Support & training

TI E2E™ forums with technical support from TI engineers

Search our extensive online knowledge base where millions of technical questions and answers are available 24/7.

Search answers from TI experts

Content is provided 'AS IS' by the respective TI and Community contributors and does not constitute TI specifications.
See terms of use.

If you have questions about quality, packaging, or ordering TI products visit our Support page.

Technical articles