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TPS61175 Efficiency Curves for 3.3Vin Boost

Leo Champagne
Prodigy 140 points
Other Parts Discussed in Thread: TPS61175, TPS55340, LM2733, TPS61027

TPS61175  Efficiency Curves for 3.3Vin  Boost
Hello, seeking TPS61175 efficiency curves for the following ckt design coditions:
Vin = 3.3Vdc
Vout = 5Vdc
Iout range = 200mA to 400mA.
Thx,
Leo

  • 0
    TI__Mastermind 35165 points

    Hi Leo,

    Can you tell me more why the TPS61175/TPS55340 were selected in such a low voltage/current application? There may be a better solution for this.

    We do not have any data for this with the TPS61175 I recommend using either the WEBENCH or SwitcherPro model to get an idea of the efficiency. We are working to get a TPS55340 WEBENCH model out there too. In the meantime both IC's are very similar the main change impacting efficiency is the TPS55340 has a lower RDSon FET and you can expect higher efficiency from it.

    We also have EVMs for each which can be used to test it in the application. We did some evaluation of a similar during the development of a 3V to 5.25V circuit and the efficiency is below. However we did not measure it at a light load. See below.

    Regards,
    Anthony 

  • 0 in reply to Anthony F
    Prodigy 140 points

    Hello Anthony,

    Thanks for the response and information. I realize that the TPS61175 or TPS55340 may not be the ideal choice for a 3.3V to 5V boost design, with such lower output currents. However, my intent was to propose a single TI Vreg solution that would also satisfy another Boost design requirement on the customer's same board. The customer also needs a 3.3V to 32V boost vreg, that would simply charge a bank of bulk capacitors totally about 5000uF. Since the previous design used an LM2733 for this 32V ckt, it was found not to be efficient enough for the 3.3V to 5V boost design.

    btw..I also recommended a much more efficient 3.3V to 5V boost solution, the TPS61027.

    Thanks,

    Leo