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TPS63002: TPS63002DRC : Buck-Boost regulator power issue

Rupesh Malavi
Prodigy 245 points
Part Number: TPS63002
Other Parts Discussed in Thread: TPS63000, , TPS63050, TPS63036

Hi Team Texas,

I am using the part no TPS63002DRC in one of my project to power USB HOST. I want know that how much current it will draw in no load condition.what our team observed is that in no load condition it is consuming almost 20mA current.that too high in our case.

  • 0
    TI__Expert 8420 points
    Hi Rupesh,
    20mA seems to be pretty high. On which board are you testing this?

    On the TPS63000EVM, when the converter is configured in forced PWM mode (PS/SYNC pin high) mode, the input current consumption can be expected in the range of 5 mA

    What are your operating conditions, application spec? The TPS63000 is a pretty old device, I can help check if there is a better fit for your application
  • 0 in reply to Sabrina
    Prodigy 245 points

    What are your operating conditions, application spec?

    ANS : Application : IOT based smart tablet device.

    we are using this buck regulator to power up the USB port in OTG mode.

     we are using forced PWM mode (PS/SYNC pin high) mode.

    Input voltage : Battery voltage : 3.4V to 4.2V

  • 0 in reply to Rupesh Malavi
    TI__Expert 8420 points
    can you precise VOUT and load profile?

    Was there any particular decision point to have chosen the TPS63002?
  • 0 in reply to Sabrina
    Prodigy 245 points

    1. can you precise VOUT and load profile?

    ANS : Vout = 5V, I=500mA maximum.

    It will not exceed above mentioned values.Load is nothing but flash drives i.e USB pen drive.

    2. Was there any particular decision point to have chosen the TPS63002?

    ANS : As per our output load requirement we chose this part.

  • 0 in reply to Rupesh Malavi
    TI__Expert 8420 points
    The TPS63050 may be a better fit for your application, it is more recent than the TPS63000.
    It does not have a fixed 5V version but the total solution size is pretty small with the WCSP version of the device. The efficiency is better.

    the TPS63036 may also be an option.
    Did you already look into these two devices?
  • 0 in reply to Sabrina
    Prodigy 245 points
    Your Team suggesting to use other regulator.This is not the solution. 5mA current is more in idle case for battery powered design.
  • 0 in reply to Rupesh Malavi
    TI__Expert 8420 points

    This is the way the TPS63000 is designed: it consumes around 3 to 5mA when set in forced PWM mode (PS/SYNC pin high) at no load, as mentioned in my first post. When configured in Power save mode  (PS/SYNC pin low) the converter consumes less than 100uA (arround 60 to 70uA) at no load depending on the operating conditions.   you could easily cross check it on a TPS63000EVM.

  • 0 in reply to Sabrina
    TI__Guru 65390 points
    Hello Rupesh,

    We haven’t heard back so we are assuming you were able to resolve your issue. If not, just post a reply below (or create a new thread if the thread has locked due to time-out).

    Best regards,
    Brigitte
  • 0 in reply to Brigitte
    Prodigy 245 points
    issue is still continue. Sorry to say, I am changing the part itself in design to avoid leakage current because of TPS63002DRC.
    Thanks for your support.
  • 0 in reply to Rupesh Malavi
    TI__Guru 65390 points
    Hello Rupesh,

    The TPS63002 does not consume 20mA in no load condition. This part consumes about 3 to 5mA in no load condition, so if you have 20mA in no load condition, you need to check if this current stays the same if you physically disconnect the load from the output of the device, if the current is still such high, we need to find out where this current is going to because then there is something in the external components you are using, causing such a high current. We observed a similar behavior on a totally different circuit with a bad inductor for example.

    What do you mean with "changing the part itself in design to avoid leakage current"?

    Best regards,
    Brigitte
  • 0 in reply to Brigitte
    Prodigy 245 points

    Hi Brigitte,

    This part consumes about 3 to 5mA in no load condition

    ANS : This is very high current in battery powered design.

    What do you mean with "changing the part itself in design to avoid leakage current"?

    ANS : Replacing TPS63002 with TPS61256YFF in next revision.

     

  • 0 in reply to Rupesh Malavi
    TI__Guru 65390 points
    Hello Rupesh,

    If you want to have minimum power consumption PWM mode cannot be used, you need to use PFM mode for this. Then the power consumption goes down to below 100uA.

    Best regards,
    Brigitte