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LMR14050-Q1:

Arjun Udayakumar
Prodigy 30 points
Part Number: LMR14050-Q1
Other Parts Discussed in Thread: LM61495, LM61460, LMR14050, LMR14020
Hi 
 
We are using TI's Buck ICs for one of our projects with a automotive giant in US (for confidential issues we cant reveal the customer as well as project name).
It would be great if you could review our layout.
 
Part NO: LMR14050QDPRTQ1
 
I have attached the schematics and layout file. Please find the same.
 
Regards,
Arjun Udayakumar​

LMR14050QDPRTQ1_BRD_23JUN2023.zip

  • 0
    TI__Guru 50120 points

    Hello Arjun,

    For newer projects, it is highly recommended to use the latest high current power converters like the LM61460 and LM61495. 

    Is there a reason why the LMR14050 device is used here?

    Regards,

    Jimmy

  • 0 in reply to Jimmy Hua
    Prodigy 30 points

    Hello Jimmy,

    We used this to power an automotive switch and its peripheral ICs. so we followed its reference design. 

    LMR14050 was the IC used in it, so we choose that.

    1) Is there any critical reason why we shouldn't be using the LMR14050.?

    Since we are in a stage where we have completed schematics as well as layout for this build. it will be very difficult to change it now. But we can consider your suggested ICs from next build onwards.

    2) Also, are you able to review our layout file.?

    Regards,

    Arjun

  • 0 in reply to Arjun Udayakumar
    TI__Guru 50120 points

    Hi Arjun,

    There is no issues using this part, just that it is generally recommended to use newer devices.

    Please expect delays since this week is TI US holiday. 

    Regards,

    Jimmy

  • 0 in reply to Jimmy Hua
    TI__Mastermind 22299 points

    Hi Arjun,

    It is not recommended to use a 5A device for your smaller currents like 0.5A and 1A currents.

    The LMR14050 high-side current limit is 7.9A(typ) and 9.7A(max). You need the inductor saturation current to be greater than that current limit, otherwise in case there is a output short circuit the inductor might saturate and could damage the device.

    You can use LMR14020 2A with lower current limits (3.2A typ and 3.8A max), or use inductors with higher saturation currents.

    However higher saturation currents will increase the overall inductor size.

    Alternative you can use lower voltage devices, you can check with WEBENCH on ideal devices that may be lower cost.

    Hope this helps,

    -Orlando