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TPS735-Q1: Max Output Capacitance?

Keith Nicholas
Mastermind 37570 points
Part Number: TPS735-Q1
Other Parts Discussed in Thread: TPS737-Q1, , TPS737

Hello Team,

Is there a maximum output capacitance requirement for TPS73533?  The device needs to maintain the output voltage after power removal to allow for an orderly shutdown.  The 3.3V output needs to hold for 5mS with around 250mA of current, requiring an output capacitance around 5000uF.

Will the device startup and remain stable with 5000uF?

What type of output capacitor will work best?  All ceramic or combination of ceramic and electrolytic?

Thanks,

Keith Nicholas
AFA OH/wPA

  • 0
    TI__Expert 3995 points
    Hi Keith,

    5000 uF is huge for an output capacitor unfortunately we don't have any tests data for it, another thing to consider for your customer's case would be reverse current which could be another issue.
    The TPS735-Q1 lacks reverse current protection and we would recommend considering the TPS737-Q1 instead, As for what would work for an output capacitor, we would recommend a combination of ceramic and electrolytic and then doing startups, brownouts, and load transients tests based on the application requirement to confirm stability.

    BR,
    Haidar
  • 0 in reply to Haidar Hamoo
    TI__Mastermind 37570 points
    Hi Haidar,

    Thank you for the response. Decided to move the hold-up capacitor to the 5v input. Thanks for the TPS737 suggestion as well.

    Regards,
    Keith N.