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Looking for right driver chip MSP430->1.2V motor

Bryan Lowder
Prodigy 90 points
Other Parts Discussed in Thread: SN754410, TPS62260LED-338, TPS62260, TPS62290, TPS62240

Tech Support told me this question was beneath their attention.  Harrumph.  Maybe someone could help?

Dear Madam/Sir, I have searched the TI website for a while now and have not quite found a chip suitable for my application. It seems as though a one- or two-chip solution should exist; I'd like to ask for help in finding it. I have in mind a toy similar to the remote-control "Bitchar-G" miniature cars that were so popular a few years ago. This toy runs a small cell-phone vibrator motor and a small solenoid directly from a 1.2-1.5 volt rechargeable lithium battery. A voltage converter boosts the supply voltage to 3.0 V to run the radio receiver. I would like to use the boosted supply voltage to run an MSP430 device, giving the car a "brain". I would like a chip or FET array that will take CMOS level control signals and switch the direct battery current at the 1.2-1.5 V level to control the motor and solenoids. The SN754410 would look like a good solution, but requires a minimum supply voltage of 4.5 V. Do you have any suggestions? Sincerely, Bryan J. Lowder

Thanks to anybody who can help. -BJL

  • 0
    TI__Expert 7845 points

    In looking around, the Half-H driver you have found may be a good option. This question is more suited for the Analog forums:
    Analog:


    http://community.ti.com/forums/default.aspx?GroupID=16

    or

    Logic:

    http://community.ti.com/forums/default.aspx?GroupID=27

    If TI does not offer a 3V device, you can also see the following:
    http://www.intersil.com/cda/deviceinfo/0,0,HIP4020.html

    I would like to clarify that NO question is beneath TI tech support, but we have decided that the best way to support our university community is via forums. As you can see that these forums are flourishing quite a bit with the combined knowledge of everyone in the tech community. So please use the forums for any future questions you may have.

  • 0 in reply to Harman
    Prodigy 90 points

    Thanks for your response! -BJL

  • 0 in reply to Bryan Lowder
    Prodigy 150 points

    I used the following to breadboard an idea I had along the same line.

    TPS62260LED-338 EVM and an EZ430-RF2500 Kit

    I was blown away.[:D]

     

  • 0 in reply to ShadowFX
    Prodigy 90 points

    Thanks, but I don't get it.  Did you use the LED driver as a motor driver? Or did you just think it was cool? I saw the demo video, definitely cool, but I didn't see any mechanical motion.-BJL

  • 0 in reply to Bryan Lowder
    Prodigy 150 points

    I used the TPS62260 to drive the motor. The TPS62260 is a bucking converter (hope I spelled that correctly [;)] ), and is pin compatible with the TPS62240 buck converter for lower current applications and the TPS62290 for higher current applications. The fact that they are used to drive LEDs is because they are current regulating, a feature which is useful in your application.

    http://focus.ti.com/lit/ds/symlink/tps62260.pdf

    By keeping the voltage fixed and "regulating" the current, you max the torque available at any given speed. I have a feeling the temperature of the motor would also benefit. The fact that they are short circuit protected is also a plus, you can smoke a motor without smoking the electronics.

    I have a TPS62260LED-338, that's why I tried it, that was what was cool. Sometimes we just wire things up, write some code and push the start button (Debug) and watch the fun. Sometimes it works (like this) and sometimes the magic smoke escapes and nothing works.

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