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LP2951: About spike measures of LP2951 startup

Seisou Hanashiro
Prodigy 60 points
Part Number: LP2951
Other Parts Discussed in Thread: LP4951C

LP2951 has spikes at startup.
Are there any parts with the same foot pattern that deal with it?

  • 0
    TI__Genius 12511 points

    Hi Hanashiro-san,

    So with the LP2951 the startup spikes are generally recommended to be handled using a feedforward cap "between SENSE and VTAP, we usually recommend 1nf-100nf for LDOs. This will AC couple the two nodes together and slow down the rise in the output voltage during startup which could reduce the overshoot you see. There are pros and cons of using a Cff which we have covered in this App Note. " This solution is presented in a question from a few years ago on the E2E forums.

    Additionally we have the LP4951C in the SOIC 8 pin configuration, which may suit your needs, but more information may be needed to acquire a more accurate replacement part recommendation. I hope the information here helps,

    John Schneider