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LMG1210: Can I defeat the internal LDO?

Brian Machesney1
Prodigy 80 points
Part Number: LMG1210
Other Parts Discussed in Thread: LMG1205, UCC27282

The LMG1210 has everything I need in a dual gate driver IC - except that the gate drive voltage is limited to 5V by the internal LDO. Is there any way to defeat the LDO so I can get 6V of gate drive?

  • 0
    TI__Genius 13445 points

    Hello Brian, 

    Thanks for your interest in our driver, my name is Mamadou Diallo, I will help address your questions.

    If you're looking to bypass the internal LDO, you would need to connect VIN pin to VDD supply which is also rated at 5.5V abs max according to table 6.1 in the datasheet. 

    For further considerations on bypassing the LDO, please refer to the thread below from my colleague.

    https://e2e.ti.com/support/power-management/f/196/t/812458?tisearch=e2e-quicksearch&keymatch=lmg1210

    Having said, why do you need the 6V gate drive? What are you trying to accomplish?

    Regards,

    -Mamadou

  • 0 in reply to Mamadou Diallo
    Prodigy 80 points

    Thanks, Mamadou.

    I want to drive GaN FETs from GaN Systems. Their max Vgs is +7V. They are specified to work with 6V gate drive, where they perform far better (lower Rds,on) than they perform with 5V drive.

  • 0 in reply to Brian Machesney1
    TI__Genius 13445 points

     Hi Brian, 

    Thanks for the clarification.

    Have you considered UCC27282 or LMG1205 as alternatives? UCC27282 driver has a 5V UVLO meaning you could operate it with the desired 6V gate drive voltage. This driver provides comparable drive strength with slightly higher propagation delays however 16ns vs 10ns for LMG1210. 

    Depending on switching frequency and load, you could effectively drive the GaN FET. Depending on the specific parameters that attracted you to LMG1210, UCC27282 or LMG1205 could be options to drive your GaN FETs to accomplish the desired Rds,on from the FET.

    Regards,

    -Mamadou