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TPS5430: Vin>36V, Vout=29V, 3A: which the best solution?

Federico Battaglin
Intellectual 545 points
Part Number: TPS5430
Other Parts Discussed in Thread: LMR14030, LMR23630, , TPS54340, LM76002, LM76003

Hello,
for a new design, the requirements are:
1) Vin > 36V
2) Vout = 29-30V
3) Iout =< 3A (typ 1,5A, 2,5A sometimes for a 1-2h)
4) price chip < 2,2 SUD
5) small BOM (max 10 components)

So, I searched for it in TI web and I have the list of some candidates:
a) LMR14030 (of 2015, 9 components)
b) LMR23630 (of 2015, 8 components)
c) TPS5430 (but seems Not Recommended for a New Design) (of 2006, 7 components)
d) TPS54340 (of 2012, 12 components).

Which is the best solution using the chip of this list or other chip not in the list?
Any idea?

Thank You and Best Regards
Federico Battaglin

  • 0
    TI__Mastermind 23845 points
    Hi,

    How about LM76002 or LM76003?
    www.ti.com/.../lm76003.pdf

    Thanks
    -Arief
  • 0 in reply to Arief Hernadi
    Intellectual 545 points
    Dear Arief,
    in first, thank you for your reply.

    But:
    a) I forgot to add n.6 requirement: "good availability".
    When I searching for a new component for a new design, in Digikey or Mouser, I normally filter "in warehouse" and "normally in warehouse", otherwise i not consider that components. The products are for sell and so I need good availability: I consider a good component, in terms of availability, when the stock is > 1.000 -2.000 pcs.

    b) LM76003: availability: on Texas website there's a very small availability (669 pcs at 3,4 USD!), and so I can no use a chip not available.

    c) LM76003: the price is over the budget! The requirement n.4 is < 2,2 USD. On Texas web site the price is 2,99USD but no availability!) In digikey less quantity availability but the price is 3,8 euro! Too much!

    d) why many chip are not available? I think there're some very big-big-big customers that purchase 99.99999% of the total production, and so many chip are not available to the rest of company...


    But are valid the chips in my list?


    Thank You and Best Regards
    Federico Battaglin
  • 0 in reply to Federico Battaglin
    TI__Mastermind 23845 points
    Hi Federico,

    In that case, i would use the LMR14030 for the design. It gives you some margin for the VIN to be at 40V. Just make sure that you have enough protection at the input to make sure the voltage did not exceed the abs max voltage of the device.

    I have seen some design where the cable inductance causes ringing and exceeding abs max of the device. But again this all depends on how fast the input is applied (Hot Swap or ramped input)

    The efficiency will be lower compared to LM76003 because it is non-synchronous device but it will give you the solution for now.

    As far as availability for LM76003, i am not sure yet why they are short handed in the field

    Thanks, i hope that helps.

    -Arief