• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 233 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LMG2100R044: about pins description table in datasheet

Toshiaki Morita
Intellectual 1932 points
Part Number: LMG2100R044

Tool/software:

Hi team,

Let me confirm about the table of pin function in the datasheet.

> AGND : Analog ground. Internally connected to low-side GaN FET source.

AGND is NOT connected to low-side GaN FET source, right ? I think PGND is connected to low-side GaN FET source and AGND is for the gate driver.

> NC : Not connected internally. Leave floating.

Dose these pins have to leave floating or is can be connected to PGND ?   

Regards,
Morita 

  • +1
    TI__Expert 4520 points

    Hello Morita,

    AGND: This pin IS connected to low-side GaN FET source

    PGND: This pin IS connected to low-side GaN FET source.

    Both power ground (PGND) and analog ground (AGND) should be referenced together, they the same node. The reason why two names are used, as you mentioned, is to separate the high current noisy power path from the more sensitive analog signals used for the integrated gate driver. One large ground plane for both power and analog signals would cause excessive ringing for the analog signals and could damage the device; however, the two planes still need to be referenced together. We accomplish this by connecting the planes at one small point inside the device between the AGND and PGND pins.

    Our recommendation: Use a dedicated ground plane for only your analog signals (AGND) and be sure to connect to the device AGND pin. Do not overlap this plane with PGND, switch node, or GaN FET drain. Use a separate ground plan for only your power loop (PGND). Do not overlap this plane with AGND, switch node, or GaN FET drain. Lastly, follow all other recommended layout guidelines in the LMG2100R044 datasheet.

    NC: Leave this pin floating.

    Do not connect this pin to PGND. This pin is used to improve board level reliability (BLR). For this reason, do not connect any NC pin to PGND.

    Let me know if you have any more questions.

    Zach Soviero