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TPS65262-2: Using for Multiple power supplies

Vyshnav vk
Intellectual 440 points
Part Number: TPS65262-2

Hi TI Team,

We are planning to use TPS65262-2 for generating on-board supplies for different interfaces on our board from 5V input. The requirement and our plan is as below

Buck 1 for 3.3V, 3A supply

Buck 2 for 2.5V, 1A supply

Buck 3 for 1.8V, 1A supply

LDO1 for 1.05V, 350mA Supply

LDO2 for 1.0V, 350mA supply.

Could you please confirm that, we can go ahead in this manner.? Also how to take care in design to achieve this configuration with these outputs.?

Best Regards,

Vyshnav Krishnan

  • 0
    TI__Expert 7420 points

    Hi Krishnan

    The LDOs cannot support 350mA output. LDO1 can support 200mA and LDO2 can support 100mA.

    BR

    Ruby

  • 0 in reply to Ruby Li
    Intellectual 440 points

    Hi Ruby,

    Thank you so much for your quick response. Could you please clarify what are those values shown in below image ie: Imax_LDO1 and Imax_LDO2 . Also in data sheet it's mentioned as, "continuous output current: 350mA/150 mA" for LDOs. This is bit confusing that which value is the maximum current that can be sourced by LDOs. Please clarify  same. Is there any other part you could suggest, which is suitable for our above requirement.?

    Best Regards,

    Vyshnav Krishnan

  • 0 in reply to Vyshnav vk
    TI__Expert 7420 points

    Hi Krishnan

    Sorry for my mistake. I refer to the wrong datasheet. For TPS65262-2, LDO1 can support 350mA, LDO2 can support 150mA. The current of the LDO should not be larger than the min current of Imax because there is variation between each part, you never know which one can support higher current. So the datasheet suggests the continuous output current: 350mA/150 mA. I didn't find any part which has both two LDO supporting up to 350mA current. Sorry for that.

    BR

    Ruby

  • 0 in reply to Ruby Li
    Intellectual 440 points

    Hi Ruby,

    Thank you for the clarification. One more query I have is, why we should consider the minimum value of current even-though it can source more current.?

    Regards,

    Vyshnav Krishnan

  • 0 in reply to Vyshnav vk
    TI__Expert 7420 points

    Hi Krishnan

    The datasheet gives the minimum value of the current, so it means that there are parts whose LDO can only support no more than the minimum current, otherwise, it may be damaged. When the customer gets the new parts, they cannot know whether the LDO of these parts can support the maximum current. So we may consider the minimum value of the current.

    BR

    Ruby