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TPS7A8300: Input supply decap

Ashutosh Nahar
Intellectual 640 points
Part Number: TPS7A8300

HI,

I want to know how much decoupling capacitor value i can put at input of TPS7A8300RGWR.

I am giving supply from switching regulator to this LDO.

In the datasheet it is mention that 10UF capacitor is ok at input side but if i use 47UF and 100UF at input side then what will be consequences?

Is there any guideline for decoupling capacitor ?

Thanks

Ashutosh

  • 0
    TI__Guru 50190 points

    Hi Ashutosh,

    For the input capacitor, you can put as much as you like. The minimum value given is to support the load transient response graphs in the datasheet. I would have to see if we have a clear guideline for minimum input capacitance as this would be a function of drop-out and load transient. For example; if Vin is 3.3V and Vout is 1.8V, then maybe you would not require so much input capacitance for a 1A/us load transient. Whereas if VIn is 2.8V and Vout is 2.5V, then you may want to have a higher CIN to support the load transient. 

    Does this help?

    Regards,