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Searching the Power Supply IC!

AndrewKim
Prodigy 170 points
Other Parts Discussed in Thread: LP8758-B0, TPS544B20

Hi, TI team. 

I am looking for the Power Supply IC. 

The IC must be meet the following conditions.  (Output Current = about 2A)

Please comment after review.  

Thanks.

Andrew.

  • 0
    TI__Guru**** 191445 points

    I'm sure we have 5 V input , 3 V output at 2 A with I2C or PMBus.  50 usec start time is fast.  It may require 6a or more additional current sourcing to be achieved, so you may actually need an 8 A device.   It is similar about about discharge.  Our devices with external discharge usually have a small FET to discharge the output on shutdown.  Fast discharge times require high sinking current to achieve.  dV/dt of 1 V/ 10 usec may require around 10 A.  I would need to research this to see if we have anything that can do this without any additional external circuitry.  Does the discharge slope have to be those precise times?  Or will the fastest suffice?

  • 0 in reply to JohnTucker
    TI__Guru**** 191445 points
    A further question. What is driving the fast rise and fall times? Our internal output discharge circuits are typically rather high resistance that will discharge in a few msec. See the above limitations with respect to the required currents.
  • 0 in reply to JohnTucker
    Prodigy 170 points
    Hello, John.
    Thanks for your reply.

    1. The discharge circuit can also be implemented using an external circuit.
    2. What is driving the fast rise and fall times?
    ==> Our Target Device is NAND Flash memory.
    3. Does the discharge slope have to be those precise times? Or will the fastest suffice?
    ==> Power IC can adjust all three discharge options with I2C. and precise time.

    Now, I am reviewing the LP8758-B0 DC-DC Converter. But It is little short on the criteria I want.
    Please review the parts that are the most satisfying.

    Thanks.
    Andrew.
  • 0 in reply to AndrewKim
    Prodigy 170 points

    Hello. TI Team.


    If you do not have a device like this specification, please recommend a similar device or circuit.

    After component selection, I will discuss with the customer.

    Thanks,

    Andrew.

  • 0 in reply to AndrewKim
    TI__Guru**** 191445 points

    You might also consider TPS544B20.

  • 0 in reply to JohnTucker
    Prodigy 170 points

    Thanks for your reply.

    Unfortunately ,  TPS544B20 does not meet the spec.  Sorry.

    As another matter,

    LP8758-B0 's Vout Range = 0.5V to 3.36V with DVS.

    Please make sure that you have a product with a similar specification to LP8758-B0 with Voutput Range = ~4 Volt.

    Thanks
    Andrew.