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LMR14020: Could we use Simple Switcher device with inverting buck-boost topology ?

Gabriel Xu
Intellectual 2105 points
Part Number: LMR14020
Other Parts Discussed in Thread: TPS5401, LMR23630, PMP10680

Hi teams

I am seeking a device to generate 20V to negative 12V output power rails.

Inverting buck-boost topology is the only topology i known can meet this requirement.

I have found a TIDA use TPS5401 to generate -12V that have shown below.

I wondering to konw:

  1. Are this topology could apply in all TI buck converter?
  2. Could this topology could apply with our synchronous converter like LMR23630?
  3. What design consideration show be noticed with this topology?

  • 0
    TI__Expert 3480 points
    Hi Gabriel,
    Pls see answers below.
    1. No. Different converter has internal different loop parameters. We must consider the loop for buck-boost configuration.
    2. Yes.
    3 . We need to consider loop stability, output current range, inductor and cap selection.


    Gavin
  • 0
    TI__Mastermind 29035 points

    Hi Gabriel,

    Almost all buck converter can be configured as non-isolated inverting buck-boost converter, buck converter maximum operation voltage should be higher than Vin+[Vout],

    Pls search PMP10680 reference design on TI website for LMR140X0 application as inverting buck-boost converter.

    B R

    Andy

  • 0 in reply to Gavin Wang (Zejing)
    TI__Intellectual 2105 points
    Hi Gavin
    Thanks for your reply.
    If not every converter could use in inverting buck-boost topology, how to select a device could achieve this or how could we know a certain device could operate in this way or not?
    Do we have any guideline or simple criterion for that?
    For 20V Vin to -12V/1A application , which device you will recommend for it?