PMP9491 Reference Design

Texas Instruments

Audio Boom Box/Portable Speaker Reference Design with Efficient Boost Converter.


PMP9491 is a 30W highly efficient and compact Portable Speaker/Audio Boom Box reference Design which can be used in 15W +15W Stereo or 30W Woofer Applications. The Power Source for the Design is 1 or 2 Li ion in Series . The design is broadly divided into three main stages:Highly efficient Single-Phase Non Synchronous Boost Converter using the LM3481 controller IC.  The design accepts an input voltage of 3.3Vin to 9Vin and provides an output of 12 V capable of supplying 2.5A of continuous current to the load.  The peak efficency acheived is 95 percent .15W+15W Stereo Audio Amplifier with TPA3118D2 Class D device. Very Low Cost Stereo Inputs to Woofer Bass Input Conversion.Battery Charger bq24133 : 2.5A Synchronous Switch-Mode Li-Ion/Li-Polymer Stand-Alone Battery Charger with Integrated MOSFETs and Power Path Selector.

  • Low Cost Non Synchronous Boost for Audio Boom Box application.Ultra Low Footprint Area for LM3481 Actual Power StageSingle Speaker (Woofer): Dual Speaker(Stereo) Support in the design Low Vin Support for Single as well as Dual Li ion Battery support100-kHz to 1-MHz Adjustable / Synchronizable Clock Frequency and limits the inrush current at start-up. Battery Charger with Dynamic Power Path management 
  • Professional speaker systems
Product Categories
  • Power management


Part Number Name Companion Part
BQ24133 BQ24133 Buy Datasheet
LM324 LM324 Buy Datasheet
LM3481 LM3481 Buy Datasheet
TPA3116D2 TPA3116D2 Buy Datasheet
TPA3118D2 TPA3118D2 Buy Datasheet
TPA3130D2 TPA3130D2 Buy Datasheet

Bill Of Materials

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Design File

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Test Data

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Other Documents

Title Updated Type Size (KB)
PMP9491 Gerber 26 Feb 2015 ZIP 322
PMP9491 BOM 26 Feb 2015 PDF 24
PMP9491 Schematic 26 Feb 2015 PDF 148