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TPS61032: current limit problem

Part Number: TPS61032
Other Parts Discussed in Thread: TPS61033

Hi dear Sir or Madam,

We received 5V 1.5A power during the prototype trials we carried out with your TPS61032RSAR product. However, in our trials with your TPS61032PWPR product with the same datasheet, we could not exceed 5V, 0.5A. In addition, when more than 0.5A current is used, it burns to the regulator. In other words, the short circuit protection and current limit are not activated.
The schematic design was carried out as suggested in the datasheet.
in the same way, it was made in accordance with the proposed layout in the PCB design. I request you to make your suggestions by considering the production of pcb. I share the PCB layout and schematic in attachments.

Abdullah ÇİFTÇİ
Hardware Design Engineer

  • Hi Abdullah,

    Thanks for using e2e.

    Do you mean TPS61032PWPR can work but TPS61032RSAR is damaged with same schematic and layout?

    What is your input voltage range? I need to check if the TPS61032 can trigger valley current limit.

    And more, about your layout, the output cap C24 is too far from the output pin, you need to place this cap as close as to VOUT pin (like red rectangle), otherwise it causes high SW voltage spike, then may cause damage to chip.

    Regards,

    Nathan  

  • Hi Nathan, Thanks For your repply,

    The chip that does not work properly is TPS61032PWPR.

    Our input voltage is between 3.4V and 3.9V. According to the voltage maximum current table on page 6 of the datasheet, we should get a minimum output of around 2.2A. But we get 400mA output momentarily, then the chip burns.


    I will test the change you mentioned and let you know the results.

    In order to get maximum efficiency from this chip, should the SYNC pin be connected to GND or VBAT pin?

  • Hi Abdullah,

    If TPS61032PWPR can't work, it is more possible to caused by layout, because SOP package has larger parasitic inductance, which can cause higher SW voltage spike.

    Connect SYNC to GND is to enable power save mode for higher efficiency in light load.

    By the way, based on your application condition, I think TPS61033 is also a suitable device, it is a new deice, it has lower cost and smaller package size, maybe you can also take it as consideration. Thanks.

    Regards,

    Nathan

  • Hi Nathan, thanks for repply.

    We solved the problem with the layout change you suggested. thank you very much Slight smile