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TPS706: Output capacitor

Noriyuki Takahashi
Genius 10000 points
Part Number: TPS706
Other Parts Discussed in Thread: TLV755, TPS7A90

Hi team

1. Customer would like to use 100uF cap as output capacitor, because this cap will help when 1-msec instantaneous power failure happens.

    Do you recommend to use 100uF cap? If no, what is the reason?

2. Are there any effective ways to deal with 1-msec instantaneous power failure?

3. Are there any recommended devices that can use 100uF cap as output capacitor? 

Here is the requirement. 

input voltage: 5V

output voltage: 3.3V

output regulation: within +/-2%

Regards,

Noriyuki Takahashi

  • 0
    TI__Guru 55940 points

    Hi Noriyuki,

    The maximum output capacitor for TPS706 is 47 uF.  For linear regulators, minimum and maximum output capacitor limits are almost always related to stability.

    The maximum capacitor limitation is only on the output side of the LDO.  You can increase the input capacitor to help hold Vin local to the IN pin high for the same effect.  If needed a diode can be placed before the input capacitor to prevent the larger input capacitor from discharging through any path other than the IN pin of the TPS706.

    We do have devices that can use a 100 uF capacitor on the output; however, these are LDOs are likely overkill for your application.

    Very Respectfully,

    Ryan

  • 0 in reply to Ryan Eslinger
    TI__Genius 10000 points
    Ryan,

    Thank.
    Just in case, could you pick the LDOs that can use a 100uF cap?

    Regards,
    Noriyuki Takahashi
  • 0 in reply to Noriyuki Takahashi
    TI__Guru 55940 points
    Hi Noriyuki,

    Please consider TPS7A90 and TLV755 to see if these will fit your other application requirements. Both of these LDOs are able to achieve the input/output and 100 uF output capacitor requirement.

    Very Respectfully,
    Ryan