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TAS2764: Low voltage portable speaker system ideal amplifier

Richard Demy
Prodigy 26 points
Part Number: TAS2764
Other Parts Discussed in Thread: TAS2572, TAS2563

Tool/software:

I have been wrestling with a simple dilemma that has turned out to be more complex that I thought.  I am designing a micro amplifier that I want to be able to make 5 watts per channel but supplied with a single cell lithium ion battery.

So minimum voltage would be 3 and max would be 4.2v. The battery is a high current draw and I want very high quality audio so a DC to DC converter to increase the voltage to the amplifier seems like it would add too much noise to the DC current. 

Does the TAS2764 which is rated for the voltage, give high enough wattage at 3 volts supply  into a 4 ohms speaker and able to get 4 or 5 watts?

Am I also barking up the wrong tree with this design.  The PCB board is roughly 10cm² and I am using a 18650 battery.

  • 0
    TI__Guru** 105055 points

    Hi Richard,

    You should look into our boosted amplifiers such as TAS2572. It supports 3V supply and up to 5.5V and features a boost to allow higher output power so 4W to 5W should be doable, take into consideration that the higher power required the higher current will be demanded from the battery.

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0 in reply to Ivan Salazar
    Prodigy 26 points

    I was looking at those.  I was thinking that a DC to DC boost converter can get me the higher voltage needed, but this seems to have that built into the IC.  Is that correct?  It still seems that the minumum power stage supply is 5.5v. I am powering this with a 18650 3.7 lion, and I am not sure that it can supply the correct voltage.

    Plus, 36 pins for a mono amp is giving me hives! Is there a simple diagram showing how it can be wired up for a 3.7 single cell battery?

    Maybe there is a different version for lower voltage.

  • 0 in reply to Richard Demy
    TI__Guru** 105055 points

    Hi Richard,

    5.5V is the maximum supported voltage, however it supports down to about 3V. Your battery delivers 3.7V, correct? What is the current capability of the battery at that 3.7V?

    What is the timeline of your project? By end of this year, we're releasing a simpler version of TAS2572, in QFN package, would that be of interest?

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0 in reply to Ivan Salazar
    Prodigy 26 points

    I am about 10 months behind right now, in a future design, that sounds great.  For now I f found a similar IC, TAS2563, seems very similar but is more available at different manufacturers for prototyping.  What is the difference with this IC?

  • 0 in reply to Ivan Salazar
    Prodigy 26 points

    I am using a 18650 and it is 3500mAh, and I think the internal circuitry limits it to 15 amps.  Should be plenty for an hour of really loud music.  I doubt max volume will draw more than 4 amps.

  • 0 in reply to Richard Demy
    TI__Guru** 105055 points

    Hi Richard,

    TAS2563 has an integrated DSP used for audio processing features such as EQ, DRC and speaker protection, the device can be used without these features if not needed though. TAS2572 does not feature the DSP, however it is a more recent version with some efficiency improvement features such as 1.8V (AVDD) bridge and a new music efficiency feature that reduces idle power consumption.

    For either case, you should be OK with 3.7V and 4A is more than enough.

    Best regards,
    -Ivan Salazar
    Applications Engineer