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LM53602: Inquiries about Vcc capacitance(Cvcc) Value change

Jin Ikeda
Expert 6420 points
Part Number: LM53602

As you know the capacitor procurement is a trouble in the world wide.

So I got below inquiries about LM53602AQPWPRQ1

 

(1) Currently, Cvcc is 3.3 uF. When changing this value from 3.3uF to 4.7 uF.

I want to make sure the characteristics that are affected by its change, and the point to re-evaluate due to this change.

 

(2) The recommend CVcc on the data sheet is “3.3uF to 4.7uF”.

In the case of using smaller capacity (2.2 uF or less) or larger capacity (10 uF or more), What problem will happen ?

Can we assume its negative impacts ?

 

Any advice will be appreciated.

Jin

  • 0
    TI__Guru 73272 points
    Hi Ikeda-san,

    Use of a 4.7uF/10V cap is acceptable, preferably with X7R dielectric. Note that there is a voltage coefficient of ceramic caps where capacitance falls off with applied voltage. So a 10uF/6.3V cap should also be acceptable as its actual in-circuit cap value is much lower than the nameplate.

    Also, ensure that the VCC cap is located close to the VCC and GND pins of the IC to minimize parasitic inductance of the connections.

    Regards,
    Tim