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Original question:

TPS541620: Looking for a voltage regulator my design

TPS541620: Low Temp Rise Buck

Rama Prasad
Prodigy 125 points
Part Number: TPS541620
Other Parts Discussed in Thread: LM65645-Q1

Tool/software:

Hi TI Team,

I am looking for a suitable solution for my Ethernet switch application with the following requirements:

  • Input Voltage: 15V (So, minimum 25V input capable buck IC required ).
  • Outputs Needed: 3.3V/3A; 1.0V/6A
  • Power Consumption: Average power consumption is approximately 4W for each output. Total 8W. 
  • Thermal Constraints: The design must undergo intrinsic safety certifications. The junction or component temperature must not exceed 50°C when the ambient temperature is 25°C.
  • I am looking for a dual buck converter or a two-stage buck converter for this application.
  • TPS541620 was a good candidate due to its dual outputs and excellent internal synchronous MOSFETs, but it supports a maximum input voltage of only 15V, making it unsuitable for my requirement.

Could you please suggest the best buck regulator that meets these specifications?

Thank you!

  • 0
    TI__Mastermind 25000 points

    Low temp and dual solution is counter to my experience. 

    An integrated dual solution will have greater power dissipation than two single solutions.  the power dissipation of one channel influences the other channel, raising the fet resistance and increasing losses. 

    Using the Webench Power Designer with 12V to 3.3V/3A and 1V/6A, I ran a simulation and it shows a 65C degree rise. 

    12V to 3.3V/1.5A and 1V/4A, i get 40C rise. 

    I think devices similar to LM65645-Q1  may be a suitable solution.