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REF3312: above max capacitive load

May
Genius 9880 points
Part Number: REF3312

Hi, 

Is there  a problem using a higher output capacitance?

In  customer design, they used a capacitance output higher than the recommended max value.  According to them, even they increase the capacitance to 75uF, it works without oscillation in all different test environment (temperature/current).

The customer the REF3312 with an input voltage of 3.3V, an input capacitance of  10uF and an output capacitance of 25uF

Regards,
Maynard

  • 0
    TI__Mastermind 19470 points

    Hi Maynard,

    We select our stable capacitor range based on worst case corner conditions. While higher values can work on typical units, maybe some units it will not work. They will have to do it with their own risk.

    Typically if customers want high capacitor values for say input to a VREF of a uC such as C2000, We recommend to use an external buffer or else they are taking a risk. 

  • 0
    TI__Intellectual 1735 points

    Hi Maynard,

    If it works for them, then they are fine. I would suggest adding a 0ohm resistor on the output of the reference in case they need to replace it with a small resistance. Usually the parasitic resistance of the trace is enough, though.

    Counterintuitively, there is a lower range where the system is stable, a middle range where it may be unstable and an upper range where the system is again stable. This middle region is the concern, so if the customer wants to make sure they are stable, go with the higher capacitance.

    -Tony