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LMG1020: Driver

Rocky Isa
Prodigy 150 points
Part Number: LMG1020

I was wondering what the mounting type was on this. is it a surface mount or is it a through hole? My team needs a through hole mounting to run tests on a breadboard. Does one exist for the LMG1020?

Thank you!

  • 0
    TI__Guru**** 189399 points

    Hi Rocky,

    The LMG1020 is in a WCSP package.

    You have two options for your prototypes:

    1. Try to find an adapter board to solder the LMG1020 on, that has pins. You would still need a hot air soldering station for this.

    2. Use the EVM for your project. 

    This part is designed for very high frequency applications. Stray inductance is your enemy, so any leaded structure will force you to reduce your operating frequency. You really need a dedicated PCB designed to accept the WCSP package with a small loop inductance to your power devices. See the EVM for an example.

    Let us know if you have further questions!

  • 0 in reply to Don Dapkus
    Prodigy 150 points
    Are there any other Drivers from TI similar to this without any extra equipment?
  • 0 in reply to Rocky Isa
    TI__Guru**** 189399 points
    Hi Rocky,

    I'm not sure what your requirements are, so it's hard to point you to a specific part. We have several drivers in PDIP packaging.

    Your best bet is to look through our gate driver selection guide and filter it for your needs.

    You can find it at: www.ti.com/.../products.html

    If you can't find the right one, or have further questions, let us know.
  • 0 in reply to Don Dapkus
    Prodigy 150 points
    Well first, we need one that can work on a breadboard for testing purposes before we advance to our PCB.
    Our application is LiDAR. We need a low ouptut current from the driver to drive a laser diode.
    I was looking at the TSP2815 model. In the data sheet, it mentions a peak output current.
    Right above that line, it mentions getting a voltage by varying the current.

    Would it be safe to assume it works vice versa? Can we vary the output current by changing the voltage? I want to make sure we can lower the output current to a range between 1 mA and 10 mA as that is the basis of our project
  • 0 in reply to Rocky Isa
    TI__Guru**** 189399 points
    Hi Rocky,

    You can think of our drivers as a resistor that can be switched on and off. So, according to Ohms law, yes, current and voltage are related. If the output current is too large for your laser diode, you can put a series resistor to limit the current, just like we do for a "normal" LED.

    In typical Lidar applications we see, the performance is quite critical, and I doubt you can achieve the required performance on a thruhole breadboard. The parasitic inductance will seriously degrade your performance. Also, remember to be very careful with the laser diode, most of them used for Lidar can damage your eyes unless proper safety precautions are not in place.

    You might want to review this document. I should have mentioned it before. www.ti.com/.../TIDA-01573
  • 0 in reply to Don Dapkus
    Prodigy 150 points
    We are aware of the different classes. Our laser diode would be Class 1, with an output power of less than 1 mW and within the allowed wavelength. For our breadboard, we arent using it to test the system as a whole, we just want to get familiar with how the relationship between the laser driver and laser diode works. Its mainly just the laser transmitter we are testing but definitely not as a final prototype. Do you think we would be able to get the laser to pulse at a certain frequency? It doesnt have to be a perfect situation, just as long as we get it to pulse at a certain frequency.
  • 0 in reply to Rocky Isa
    TI__Guru**** 189399 points
    Hi Rocky,

    In that case, you might be ok. Your rise and fall times will be slower than you'd like for a closed-loop lidar system, but just to test the system for basic functionality, it might work.