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TPS65990: TPS65981: Would it need a heatsink on a 4 layer board if I followed the layout examples from the datasheet exactly?

Samuel Walsh
Prodigy 10 points
Part Number: TPS65990
Other Parts Discussed in Thread: TPS65981

It is probably me and I am missing the information but I want to know about maximum power dissipation from this device, I was planning to follow the example layout exactly from the datasheet but this doesn't state whether the layout is good for the entire current range (20V/5A or what kind of thermal performance I would get if I followed that layout.

I would be using a thin 4-8 layer board, really I want to know what kind of losses I am going to expect with this device and how much heat it is going to produce at max

Also does anyone have any information on when the TPS5990 datasheet is going to completed? I would like to use it in a product but the datasheet is not completed

Best wishes

Sam

  • 0
    TI__Mastermind 36751 points
    Dear customer, Thank you for your interest in a Texas Instrument’s solution. Due to the Christmas/New Year holidays, our response time is likely to be longer than usual. Rest assured we have received your question and want to close it as soon as possible. If this is truly urgent, we suggest you work through your local support and/or procurement channels.
  • 0 in reply to Eric Beljaars
    TI__Genius 10370 points

    Hi Samuel,

    Welcome to E2E! What's the application that you're trying to build with both the TPS65981 and the TPS65990?

    We're aiming to release the TPS65990 full datasheet around April 2018 (This date is subject to change). In terms of the power dissipation of the device, the quiescent current will be negligible compared to the current flowing through the power paths (internal and external). I would recommend using the TPS65981 datasheet Layout section as a guideline for now.

    To figure out how wide one should make the traces, we usually recommend using a trace width calculator which can be found here: http://www.4pcb.com/trace-width-calculator.html 

    If this answers your question, PLEASE select  This resolved my issue.  I hope this helps and thank you for using our parts for your design :-)