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LMG3522R050: Driving vneg directly

Brian Empson
Prodigy 10 points

Part Number: LMG3522R050

I'm designing with an lmg3522r050, and I wanted to investigate the possibility of supplying VNEG from -15 supply and forgo the usage of the internal converter, to drive higher frequencies than the rated 3.6mhz. Is driving vneg possible?

  • 0
    TI__Expert 7985 points

    Hi Brian,

    Yes, the LMG3522 device's VNEG pin can be driven by external supply. The -14V on VNEG is usually powered by an integrated inverting buck boost (IBB) in the driver, the switching frequency limit is a factor of how much power this IBB can supply. An external -15V supply on the VNEG pin will allow you to drive the device at higher frequencies. 

    Best,

    Kyle Wolf