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TPS7A7300: Output capacitance

Part Number: TPS7A7300
Other Parts Discussed in Thread: TPS7A84A, TPS7A89

LDO team,

One of our customers has built boards with the TPS7A7300 with output capacitance of about 1000uF.  This is much higher than the max given in the datasheet of 200uF.  What kind of impact will this have on the performance of the TPS7A7300?  We're especially interested in if it will cause damage over the long run.

Thanks,

Darren

  • Hi Darren,

    Output capacitance outside of the Recommended Operating Conditions for TPS7A7300 can lead to instability particularly during startup when the high output capacitance will cause the LDO to operate in current limit while the capacitors charge.

    Do you know the reason for such high capacitance? Many times we are seeing customers try to use one LDO to power multiple rails separated by pi-filters with ferite beads. If this is the case, you will gain better rail isolation using multiple LDOs to power each rail. This can be accomplished using a dual LDO such as TPS7A89. If you are powering a single rail that requires that much capacitance, please consider TPS7A84A which does not have a restriction on the high output capacitance.

    Very Respectfully,
    Ryan