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TLV1117-33 and TLV1117-50 capacitor selection

Hikmet Tekin8
Prodigy 130 points
Other Parts Discussed in Thread: TLV1117

Hi All,

I will going to use TLV1117 for 3.3V regulation and 5V regulation. I checked the datasheet and could not figure out the capacitor values. 

I found some example circiut on web and they used ceramic caps and Can I use or do I have to use polarized caps? (like tantalum).

For 3.3V what cap values should I use on input and output?

and same thing for 5V.

thanks

  • 0
    TI__Mastermind 24975 points
    Hello Hikmet,

    For the input capacitor, typically bigger is better because it ensures that any glitches from the supply won't interrupt the operation of the regulator by reducing the input voltage. In many cases 2uF is adequate. The schematic in the datasheet suggests 10uF. The input capacitor can be any form of capacitor.

    The output capacitor is very particular, please note section 8.1 on page 10 of the datasheet. This discusses the appropriate ESR values for this device (0.2 to 10 ohm) implying that electrolytic or tantalum caps are preferred. Ceramic can be used if a series resistance is added (usually 1 Ohm). The datasheet suggests 100uF on the output, but this large of a capacitor is probably not necessary. Again, bigger is better for stability and transient response.

    Best,
    Michael