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LM62460-Q1: Criteria for Output capacitor selection

Shubham Singhal
Prodigy 60 points
Part Number: LM62460-Q1
Other Parts Discussed in Thread: LM62460

Tool/software:

Hi Team, 

We are planning to use LM62460 device with below configuration.

Vout = 3.3V

Iout = 0.5 A

Frequency = 2.2MHz

As per datasheet for Cout it is recommended to use 5*22uF caps.

Since our current requirement is quite low (0.5A), please suggest the minimum capacitance required.

We have attempted calculations using the provided Excel Calculator Tool, but it yields similar values.

Could you share some guidelines or criteria for determining the appropriate Cout value?

Regards

Shubham

  • 0
    TI__Guru 72845 points

    Hello

    What is your maximum current ??

    This device is optimized for 6A.

    You may want to look at another device.

    Thanks

  • 0 in reply to Frank De Stasi
    Prodigy 60 points

    The maximum current in our application is 0.5A.

    Please suggest if it can be used with this current and what will be suitable cap values.

  • 0 in reply to Shubham Singhal
    TI__Guru 72845 points

    Hello

    This device was not optimized for such a low output current.

    You will need to follow the data sheet recommendations, regardless.

    You may want to look at a lower current device, with smaller output capacitance requirements.

    Thanks

  • 0 in reply to Frank De Stasi
    Prodigy 60 points

    Hello Frank,

    Thank you for your input.

    Please check the situation below and provide your feedback..

    In our case, the maximum operating ambient temperature is 125°C (Engine Room product). If we consider the internal heat of PCB, Ta_max would be higher.

    As per the datasheet of this device, the graph below shows the maximum output current Vs T_amb, and it is around 2A in our condition. If we consider some margin, I think it will be reasonable to consider this device. Please provide your opinion.

    Also, there is one device, LM63440-Q,1, which is a 4A product. Given the above situation, please suggest if this device will be more suitable for our application.

    Looking forward to your prompt response.

    Regards

    Shubham

  • 0 in reply to Shubham Singhal
    TI__Guru 72845 points

    Hello

    If you have the same conditions as shown in the graph, including the RθJA, then with your high ambient temperature

    you can use this device.  You should use at least 4x or 5x 22uF ceramic for the output.

    Thanks