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LMG1210: LMG1210 Half Bridge MOSFET and GaN FET Driver

Karan Maru
Prodigy 65 points
Part Number: LMG1210


Hey,

I was using LMG1210 in independent input mode (IIM). I'd like to confirm if LMG1210 would work for negative rail voltages on HB & HS? According to the datasheet, it should be able to switch as long as HB-HS < 5.5 V. However, I'd like to confirm it before incorporating it in my application. I am attaching a snippet of the circuit. I will only be using the high side without bootstrapping. Any help is appreciated.

Thanks,

Karan

  • 0
    TI__Genius 12990 points

    Hi Karan,

    Thanks for reaching out on e2e again, you are correct. The negative voltage capability of lmg1210 is limited by the HB-HS voltage as well as the bootstrap diode forward voltage, however if no bootstrap is being used then the HB-HS voltage should remain at about 5V for the high-side drive as you said. For example, using a -13V bus voltage (while VSS=0V) then a bootstrap diode cannot be used (due to BST voltage rating out of spec). If HS is at -13V, then HB should be at -8V as you have it. If needing to power the high-side FET without a bootstrap, you need an isolated supply for HB-HS (for example a LDO with respect to HS) while floating the BST pin. Let me know if you have any questions.

    Thanks,