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TPS22964C: About short circuit current

ACGUY
Guru 11170 points
Part Number: TPS22964C
Other Parts Discussed in Thread: TPS22953, TPS2595

Hello E2E,

Our customer is considering adopting the TPS22953 for new design.
In the datasheet p24 says "After the RESTART time, the switch is automatically re-enabled as long as EN is still above V IH, EN.".
I think when shorted, output current will be over the absolut maximum at instantaneously.

Question;
Does this device have mitigation provision for pulse current?

Regards,
ACGUY

  • 0
    TI__Genius 10855 points
    Hi ACGUY,

    The TPS22953 doesn't have inherit protection against fast pulse currents. If you are interested in a device with overvoltage protection, I recommend looking at one of our eFuses, such as the TPS2595.

    Thanks,
    Arthur Huang
  • 0 in reply to Alpha H
    Guru 11170 points
    Hi Arthur,

    Thank you for advice.

    In other words, if happend OUT short to GND, output current will be over the absolut maximum at instantaneously.
    Therefor this device is not to allow about short OUT to GND.
    Is it correct?

    Regards,
    ACGUY
  • 0 in reply to ACGUY
    TI__Genius 10855 points

    Hi ACGUY, 

    The TPS22953 will reach to a short to gnd in 5us (Tdeglitch). Depending on the severity of the output short to gnd, it could exceed the absolute maximum of the device within this period of time. The severity of the short is system dependent, if the short occurs over a longer duration or is less severe, then the TPS22953 will react accordingly. 

    I recommend ordering a TPS22953EVM and replication the system configuration and output SHORT to GND. You could also switch to an eFuse, such as the TPS2595, which has additional protection features such as short to gnd protection.

    Thanks,

    Arthur Huang


  • 0 in reply to Alpha H
    Guru 11170 points

    Hi Arthur,

    Iout(max) is Vout/Ron. If Vout=5V that Iout is 357A(max) at instantly.
    That is over the absolute maximam range.

    This device is not to allow about short OUT to GND.
    Is it correct?

    Please answer in Yes or No.

    Rergards,
    ACGUY

  • 0 in reply to ACGUY
    TI__Genius 10855 points

    Hi ACGUY, 

    If the Iout(max) reaches ~350A during a short OUT to GND,then you are correct, the device could potentially be damaged. 

    Thanks,

    Arthur Huang