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TPS780: Can TPS780 be connected in parallel to increase output current?

Dan1
Intellectual 865 points
Part Number: TPS780
Other Parts Discussed in Thread: TPS7A02, TPS7A10

Hi,

Can two TPS780 be connected in parallel to double the output current?

Kind regards,

  • 0
    TI__Mastermind 44630 points

    Hi Dan,

    Unfortunately no. There is no way to guarantee that they will share. We do have the following reference design for a much higher current LDO and this works because the reference can shared between the two devices. 

    We do have a much lower IQ and all-around better-performing device the TPS7A02 which can support a little more current (up to 200mA). If 300mA is needed, we have the TPS7A10 but this has a much higher IQ. 

    I hope this helps.

  • 0 in reply to JCHK
    Intellectual 865 points

    Thanks JCHK,

    Sorry about the delayed reply. I had some time off work.

    The TPS7A02 has amazing Iq (on and off). It’s great in every way, except that it’s not adjustable. However, the 130µVRMS noise would need testing.

    Our goal is to minimise the number of unique components in the design. Each analogue supply would have it’s own LDO, but we are trying to use the same LDO part for each.

    If I’m honest, it’s Iq is so good that it wouldn’t be that bad if we had to increase the part count in the BOM, but is there an option for adjustable output with nanopower Iq?

    We need to drop 3.3V down to 1.8V, and also down to something above 3.0V (the higher the better).

    • 1.8V will need 160mA (rounded up) but the voltage gap is so big that the dropout shouldn’t matter. This requirement is why I wanted to parallel the TPS780 (150mA).
    • >3.0V is still supplying some unknowns but it should be less than 100mA. I was aiming for 3.2V, but 3.1V would be ok. The TPS7A10 might be ok for this if we’re stuck with fixed output.

    Kind regards,

  • 0 in reply to Dan1
    TI__Mastermind 44630 points

    Hi Dan,

    Our lowest IQ adjustable device is the TPS7A24 or if more current is needed the TPS7A25. These both have a 2uA typical IQ and for adjustable, there is additional leaking in the feedback resistor path. 

    The nice thing about the TPS7A02 is that we have released most of the voltages you mention above (3.2 is currently not released).

    With respect to stepping 3.3V down to something higher than 3.0V (the higher the better), What are you looking for? Most of our devices have the ability to make 50mV steps (i.e. 3.2, or 3.25). We just don't release them as they are not currently common voltage rails. 

    I hope this helps.

  • 0 in reply to JCHK
    Intellectual 865 points

    Thanks John,

    That's more than enough for me to work with.

    Kind regards,