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TPS63070: wide range input

Karthik B
Expert 1310 points
Part Number: TPS63070
Other Parts Discussed in Thread: TPS63060, LM5118, LM25118, TPS61088

Dear Team,

Hi I have requirement o a regulator that will be operated by a 3.7V battery or 7.4V battery or by 12V DC supply.(either 3.7V battery will be there or 7.4V battery will be there) I need the regulator that provides 5V, 3-4A stable output with these different voltages.

I have selected TPS63070 part , will it support the my requirement? What is the efficiency of this regulator?

Since the battery voltage keeps on reducing its minimum input should support from 2.5V, From the datasheet this will satisfy the requirement.

But if there is any better part please suggest ASAP.So that i can use it for my design.

Regards,

Karthik

  • 0
    TI__Guru 65170 points
    Hello Karthik,

    Pleaser review figures 18 and 20 in the datasheet to get an overview of the current capability of a typical unit at different input and output voltages.
    These curves show as well that higher temperature means lower output current.

    I do not have another component to recommend, so dependent on your real load requirements, please check if this part fits your needs.

    Best regards,
    Brigitte
  • 0 in reply to Brigitte
    Expert 1310 points

    Dear Brigette,

    Actually my requirement is 

    Case 1: 3.7V(Iin=4A) Input voltage and 5V 3A output voltage

    Case 2: 7.4V(Iin=2A) Input voltage and 5V 3A output voltage

    Case 3:12V(Iin=1.5A) Input voltage and 5V 3A output voltage

    These are the 3 cases, first 2 case are battery operated and last case is DC external supply.

    So I need a single regulator for this application and I saw TPS63070 and TPS63060. so I need a confirmation whether I can go ahead with this regulator or else there are any other options . Please suggest

    Regards,

    Karthiik

  • 0 in reply to Karthik B
    Expert 1310 points
    Hi,

    We understand the curve, we studied datasheets of parts like LM25118MH, TPS63070 and TPS63060. But we can not depend only on datasheet details as we need to check whether the parts selected meet our exact requirement. So we put down our exact requirement as below :

    ase 1: 3.7V Input voltage and 5V 3A output voltage

    Case 2: 7.4V Input voltage and 5V 3A output voltage

    Case 3: 12V Input voltage and 5V 3A output voltage

    We need to design the PCB with 1 single regulator such that it must be compatible with all 3 cases mentioned above.

    Now we started simulating these 3 regulators ( LM25118MH, TPS63070 and TPS63060) using TI Webench tool but we see that we can't use any of these ICs for Vin = 3.7V case. That is why we are asking you whether this is because of Webench tool issue or Whether these 3 parts can not be used fo our requirement? If you can tell us and confirm we will initiate the design ASAP. We are looking for a quick response as we need to catch up the schedule for design activities. So please help us to get a right solution ASAP.

    Regards,
    Karthik
  • 0 in reply to Karthik B
    TI__Guru 65170 points
    Hello Karthik,

    According the datasheet curves in the application section showing the output current over input voltage, TPS63060 is not capable of 3A.
    TPS63070 is not able to fulfill Case 1 above. For Cases 2 and 3 TPS63070 is at its limit dependent on the ambient temperature you want to operate the device.

    If you are searching for a single device fulfilling all 3 cases, neither TPS63070 nor TPS63060 can fulfill this.

    In general, it is extremely important to have a look at the real load profile for selecting the correct component. Do you need 3A DC or does your load only request 3A for a very short period of time. Be aware that such pulses could be supplied from the output capacitor (dependent on the length of the pulse) and you do not need a 3A device for short 3A pulses.

    Best regards,
    Brigitte
  • 0 in reply to Brigitte
    Expert 1310 points
    Hi,

    Yes my system load requires continous 3A DC .
    OK TPS series will not support but what about the LM25118 and LM5118 regultors .
    I had done some simulations for all the 3 cases of mine and it showed up below results.
    LM25118
    3.5V-4.2V 5V,3A 100mV to 200mV
    6.7V-8.4V 5V,3A 5mV to 10mV
    12V 5V,3A
    LM5118
    3.2V-4.2V 5V,3A 200mV to 300mV
    5.5V-8.4V 5V,3A 200mV
    11.8V-12V 5V,3A

    These are observation that i made could you please suggest whether this will support my requirement or any alternate part that yu would like to suggest.
    I am lagging behind in the schedule please suggest a solution ASAP.

    Regards,
    Karthik
  • 0 in reply to Karthik B
    Expert 1310 points

    Hi,

    Any updates on the regulator side please suggest ASAP.

    Because I am running out of schedule.

    Regards,
    Karthik

  • 0 in reply to Karthik B
    TI__Mastermind 46905 points
    Hi Karthik,
    the LM25118 is the closest buck-boost controller for this application.
    other typologies I am thinking is a buck converter and a boost converter in series. a boost converter such as TPS61088 to get at least 6V output voltage, then a buck converter to get 5V, 3A output.
  • 0 in reply to Jasper Li
    TI__Mastermind 46905 points
    Hi Karthik,

    I haven’t heard back from you, I’m assuming you were able to resolve your issue. If not, just post a reply below