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2 grounds

Rohit Patel
Prodigy 10 points
Other Parts Discussed in Thread: LM2936

Dear TI Engineers, there are two grounds, pin 2 and pin 3 as well as pin 6 and pin 7 per side of LM2936M SOIC (D) Package.  Why do I need two grounds?  I am trying to adhere to 2mm spacing, and I would like to only use one ground per side in my 4-20mA 24V Intrinsically Safe (IS) application?  Do you see a problem?  What are the ampacities on the leads, etc...????  Why were two grounds provided in the first place.

Additionally, historically, we have not a Cout (output capacitor)--we assume this is no problem, correct?  This just affects our stability, and we are fine with stability, correct?  Thanks for your help!  Best Regards, Rohit

  • 0
    TI__Mastermind 22610 points
    The four ground pins on the LM2936M (SOIC) is a function of the internal lead frame and is intended to provide an improved thermal path to remove heat from the die. Use only one pin if you want, your choice which one, electrically there is no difference.

    LM2936 is a PNP type LDO and requires Cout with ESR for stability. The minimum Cout value, and the Min/Max ESR range, is listed in the Electrical Characteristics table. Ceramic (MLCC) capacitor type is not appropriate for the LM2936 Cout due to low ESR, although series R can be added to simulate the required ESR.