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BQ76952: maximum Current into ESD pin protection

Michael Kienle
Prodigy 10 points
Part Number: BQ76952

Tool/software:

Hi,

quick question regarding the absolute maximum ratings of the Alert, shutdown and I2C pins of the BQ76952:

The Datasheet states the maximum voltage is 6,0V due to the ESD protection. However, during assembly when the connectors are plugged in, we can have some current injected into these pins. I can not find any information, how much current these pins can handle while limiting the Voltage. Normally the absolute maximum ratings should gibe a Voltage range AND a maximum allowable current rating. 

best regards,

Michael

  • 0
    Prodigy 10 points

    Hi, 

    is there no information available for this device at all? 

  • 0 in reply to Michael Kienle
    TI__Prodigy 570 points

    Sorry the ESD Engineer that worked on this project is out of office for a few weeks.
    Another ESD Engineer did provide a simulation where the ESD device was in snapback while limiting the pin voltage to <6V. In this scenario, the ESD protection device can take up to 190mA at room temp before catastrophic failure. This is just 1 current sweep measurement on 1 sample and does not imply that the cell is not being soft-damaged and potentially fail during product lifetime. 

  • 0 in reply to Gavin Long
    Prodigy 10 points

    okay, thanks. Is this 190mA also working for negative currents(limiting the voltage to about -0,5V)? Was this simulated with continuous current or a current peak of a certain duration?

    I think it would be good adding this information to the datasheet, as it is stated in most datasheets in the abs. max ratings.