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50W 5V boost controller

Emile Pierloot
Prodigy 20 points
Other Parts Discussed in Thread: TPS60151

I'm wondering what the best product is to design around for a boost circuit with a 5V output that can handle 50W output power.
Looking into several input voltages around 1.85V, 3.7V or higher if necessary.Efficiency preferable around 90%.

I think a synchronous step up controller with external mosfet would be necessary, but I have not found any applications like this one, so I'm not sure about stability issues.
Thanks in advance if someone has any tips or sollutions.

  • 0
    TI__Guru* 78270 points
    Hi Emile,

    Thank you for posting. You are right that this should consider a sync controller with external MOSFETs. What is your input voltage range? If it is 1.85-3.7V, I am afraid we don't have an existing analog boost controller for a simple solution.

    Thanks,
    Youhao Xi, Applications Engineering
  • 0 in reply to Youhao Xi
    Prodigy 20 points

    Hi Youhao Xi

    Thank for your quick response.
    The input voltage would be fairly stable, dropping approximately 200mV max. I'm looking for solutions for a nominal input voltage of 1.85 OR 3.7V, but 3.7V is probably the most realistic.

    Kind regards
    Emile

  • 0 in reply to Emile Pierloot
    TI__Guru* 78270 points
    Hi Emile,

    This falls in a range of no part alone can solve. If your input is at 3.7V, you may consider the LM25122, and also employ a simple charge pump (TPS60151) to produce 5V, and feed that 5V to the LM25112's VCC pin through a schottky diode, then the LM25122 should operate to support your 5V output.

    Thanks,
    Youhao