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TPS61029: Consumption current when disabling TPS61029

Hayashi
Expert 1840 points
Part Number: TPS61029

Hi teams

When the TPS 61029 is disabled, it generates about 60 ° C. Is it possible to generate such heat when disabled?
The power supply configuration is as follows.
The input voltage is 1.2 [V] (nickel metal hydride battery) or 5 [V] (USB) (supplied from a nickel metal hydride battery unless it is stuck)
The output voltage is 3.8 [V].
The current is about 33 [mA], and the setting of the IC sets the PS pin to LOW. (Connect to GND)
As a result of examination, the space between SW pin and GND is 10 ~ 12 [Ω], but it was about 400 Ω just after mounting on the board.
I would appreciate it very much if you could advise me anything.
Best regards
Hayashi
  • 0
    TI__Mastermind 21565 points
    Hi Hayashi:
    According your description, I doubt the IC is damaged. Please replace a new TPS61029 and test the heat.

    Is the 33mA load condition? or what's the load?
  • 0 in reply to Minqiu Xie
    TI__Mastermind 21565 points
    Hi Hayashi:
    I closed post as I assume you had solve the issue. if not, just reply below.
  • 0 in reply to Minqiu Xie
    Expert 1840 points
    Minqiu san

    Thank you for your support.
    Would you mind add question?

    If I switch the device's input voltage from 1.5V battery to 5V USB power at once, will the device be damaged?
    On the data sheet, I think that there is no problem, but depending on the rising voltage will it lead to damage?

    Please let me know your thoughts.

    Best regards
    Hayashi
  • 0 in reply to Hayashi
    TI__Mastermind 21565 points
    Hi Hayashi:
    It's my pleasure to support.

    The Absolute Maximum Ratings for TPS61029's Vbat, SW, Vout is 7V. So please make sure that there is no high voltage spike during input source switch.
  • 0 in reply to Minqiu Xie
    Expert 1840 points
    Minqiu san

    Thank you for your support.
    I was very helpful in your advice.

    I think that there is a possibility that the power supply voltage may exceed 7V when the device suddenly changes from 1.5V drive to 5V, probably because of this.
    Does this device assume such a voltage fluctuation?

    Kind regards,
    Hayashi
  • 0 in reply to Hayashi
    TI__Mastermind 21565 points

    Hi Hayashi:

    "Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
    only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
    Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability."

    Larger input capacitor may do some help. Or you could add a zener diode to prevent the high voltage.