• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 62 subscribers
  • Views 373 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.

MC79L: Output capacitor & the difference of LM79L

Noriyuki Takahashi
Genius 11230 points
Part Number: MC79L
Other Parts Discussed in Thread: LM79L,

Hi team

Is it OK to use a 0.1uF, low ESR capacitor like ceramic as the output cap?

Then could you also tell the difference of  MC79L & LM79L? Not sure which devices customer should use.

Regards,

Noriyuki Takahashi

  • 0
    TI__Genius 12511 points

    Hi Takahashi-san,

    The LM79L is quite an old part, and as such was most likely not designed with low esr capacitors in mind. We do not have a stability graph for this part, but it is recommended to utilize a higher resistance capacitor at the output for this part. Alternatively they may place a series resistance on the output capacitor to stabilize the control loop.

    The *LM79L input voltage goes lower than the MC79L *-30 vs -20, has worse noise performance *400uVrms vs 40uVrms, lower quiescent current *2uA vs 6uA, and better thermal performance.

    So in general The LM79L has wider range of inputs, with better thermals and quiescent current at the cost of noise performance.

    Regards,

    John