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TPS63001 or similar need help about it urgent

Emanuel Dabah
Prodigy 85 points
Other Parts Discussed in Thread: TPS63001, TPS61030, TPS43000, TPS63020, TPS61031

Dear All we are looking for step up voltage

input 1.8V

output 3.7 V

max pick current for 0.5mS 2.5 Ampere

average 400mA 

looks like the TPS63001 easly can suply the demand of the average but about the picks I can not find nothing

1mF C  in the output will be ok?

 

Thank you!

 

 

 

  • 0
    TI__Guru**** 150820 points

    For just a boost application, the TPS61030 would be best.  It and the TPS630x0 parts can support a large output cap, but make sure the ESR is above the 30 mOhm recommended for the TPS61030.

    The 2.5A for 500usec will exceed the capabilities of any of our integrated parts.  But all this means is that the IC will not be able to provide all of the current for that amount of time and that the output voltage will drop, according to how much current your bulk output capacitor must supply: I = C dV/dt.  If this voltage drop is not acceptable, then you will need to move to an external switch part, such as the TPS43000.

    I encourage you to order the EVM for whichever solution you choose and evaluate that with your components before building any boards yourself.  This will allow you to quickly test a circuit on a known good layout and discover any issues that might occur with your components or setup.

  • 0 in reply to Chris Glaser
    Prodigy 85 points

    can somone supply the graphs Vin Ver I out

    Vou ver I out

     

    this is the only chip that I can not find the graphs

     

  • 0 in reply to Emanuel Dabah
    TI__Guru**** 150820 points

    I'm not sure what you require.  Figures 8 and 9 give Vout versus Iout data for the TPS61030.  Is this what you need?

  • 0 in reply to Chris Glaser
    Prodigy 85 points

    thank ,but I need it for the 43000

  • 0 in reply to Emanuel Dabah
    TI__Guru**** 150820 points

    The TPS43000 is a controller.  So, the output power it can provide is limited by the external components, mainly the FETs and inductor.  This is different than an integrated solution, such as the TPS61030, where the current limit is set internally.

    If the TPS43000 is designed to fully support 2.5A at 3.7V from a 1.8V source, then the output voltage will be maintained at the setpoint, +/- the tolerance of the reference and feedback resistors.

  • 0 in reply to Chris Glaser
    Prodigy 85 points

    just to confirm

    the TPS 43000 will support my requirment?

    2.5 A  out put at 3.7V at 1.8V input ?

     

    if yes then really thank u!!

     

  • 0 in reply to Emanuel Dabah
    TI__Guru**** 150820 points

    Yes, the TPS43000 can support those requirements.

  • 0 in reply to Chris Glaser
    Prodigy 85 points

    Thank you very much Sir!

     

  • 0 in reply to Emanuel Dabah
    TI__Mastermind 36110 points

    If your application can accept a voltage drop on the output during your 2.5A load transient, a smaller integrated solution in the TPS6xxxx family will be very easy to design with.  The TPS63020 has a 4A switch current rating.  Refer to the datasheet to understand the actual available current as a function of Vin and Vout.  Also note that if your 1.8V input voltage has a high source impedance, the 1.8V buss will drop during your load transient and affect the availble output current.  It would be a good idea for you to test the functionality of our EVMs with your load to evaluate performane before making a final decision.

  • 0 in reply to Matthew Day
    Prodigy 85 points

    my circuite need 3.7V and can accept  0.35V drop

    is it ok?

  • 0 in reply to Emanuel Dabah
    TI__Guru**** 150820 points

    I agree with Michael that a TPS6xxxx solution will be much easier for you to implement.  I would not recommend the TPS63020, as it has a dynamic current limit feature that reduces the current limit when Vin is less than 2.3V.  For this reason, the IC I would recommend is the TPS61030.  Since it cannot supply your 2.5A, the output will drop when given that load.  Since you can accept 0.35V of drop, that should be fine.

    From figure 1 in its datasheet, the TPS61030 can supply about 1.6A with 1.8V in at 3.3V out (TPS61031 = 3.3V).  So, for a 3.7V output, I would expect it to be able to provide around 1.4A. So, your output capacitor will need to supply the additional 1.1A for the 500 usec burst.  From I = C dV/dt, the dV from a 1mF output cap is 0.55V.  But you will need at least a 220uF near the IC with some ESR for loop stability (as explained in the datasheet).  Just add one more 220uF and then dV now becomes 380mV.  This configuration should be a good start to begin evaluating your design.

    Since you can accept that much drop, I recommend this approach over the TPS43000.