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LMG2100R044: Level shifting gate driver control logic

Dan Rechichi
Prodigy 70 points
Part Number: LMG2100R044
Other Parts Discussed in Thread: LMG5200

Tool/software:

Hi,

We have a buck regulator that is expecting to drive MOSFET gates at 10V, but the LMG2100R044 is only able to tolerate up to 6V on it's gate driver control logic pins (Hi and Lo).

Is a voltage divider the best way to shift the PWM voltage when switching roughly between 500kHz and 1MHz?
e.g. are there internal low accuracy bias resistors on these pins that would compromise the divider?

There's no guarantee that we can supply the buck regulators bootstrap pin with less than 10V so we're exploring other options.

Kind regards,

Dan

  • 0
    TI__Expert 4865 points

    Hi Dan,

    Yes, a voltage divider is the most simple way to drive the HI and LI pins of the LMG5200. It is good to put resistors on the order of 10k to minimize propagation delays between external gate drive output and internal LMG5200 gate driver.

    Regarding the bootstrap, as long as you are providing the VCC pin with 5V, all that is required is a bootstrap capacitor between HB and HS.  

    Thanks,

    John