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TLV760: ESR versus Capacitance

MC
Prodigy 180 points
Part Number: TLV760
Other Parts Discussed in Thread: TLV1117, LM1086, LM1117,

Dear Sirs,

Is there some extra data regarding the limits of ESR for the output capacitance? (ESR versus Co)

Regards,

VS

  • 0
    TI__Mastermind 37005 points

    Hi VS,

    Per the datasheet, there are no restrictions on the ESR.
    As ESR increases, the capacitors ability to provide a surge of current during load transient events will diminish.
    Please consider the transient response you need on the output when choosing an output capacitor.

    Thanks,

    - Stephen

  • 0 in reply to Stephen Ziel
    Prodigy 180 points

    Hi Stephen,

    Thanks for the info. Fortunately the TLV760 has no serious limitation on ESR and capacitor values but that it's almost an exception among popular LDOs. Instead of starting a new thread can you provide similar info on TLV1117, LM1117 and LM1086?

    Regards,

    VS

  • 0 in reply to MC
    TI__Mastermind 37005 points

    Hi VS,

    Here are the answers:

    TLV1117
    ESR requirement is between 0.2 ohms and 10 ohms.

    LM1117
    ESR requirement is between 0.3 ohms to 22 ohms.

    LM1086
    Unfortunately, the datasheet does not provide a specific value but states that "tantalum" and "aluminum electrolytic" capacitors will stabilize the LDO.  The ESR of these capacitor types are on par with the LM1117 and TLV1117.

    Thanks,

    - Stephen