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TPSM53602: Internal 5V LDO usage

Andreas Nestler
Intellectual 350 points
Part Number: TPSM53602
Other Parts Discussed in Thread: TPS3702,

Hello,

is it possible to use the 5V LDO output to supply three (3) TPS3702 monitor ICs (connected to VDD Pin of TPS3702)?

TPS3702 has a max. VDD current of 12uA each, so total current well below 50uA. Pull-ups are tied to another voltage (3.3V, which is generated by TPSM53602). We would like to avoid an additional regulator only for that small amount of current. The input voltage of TPSM53602 is 25V nominal (min 13V/ max  28V) and generates 3.3V. I think from current consumption point this should be fine (100k pull-up at power Good means current draw of 50uA as well). Maybe it is not recommended to route the V5V supply voltage several cm on PCB board. Could you please clarify this or give some hints?

Thanks in advance!

Regards Andreas N.

  • 0
    TI__Guru 72485 points

    Hi Andreas,

    Thank you for using our products.  I do not see a problem of consuming 50uA from V5V, but why not also use 3.3V to feed TPS3702's VDD?  As you may know, switching converter (here is the 3.3Vout) is always efficiency than the linear circuit like the internal LDO.  

    Thanks,

    Youhao

  • 0 in reply to Youhao Xi
    TI__Guru 72485 points

    Hi Andreas,

    Since there is no update from you side after 2 weeks, may I assume the issue is resolved and we can close this thread?  You can re-open it by adding a new post.

    Thanks,

    Youhao