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BQ24160: BQ24160 EOS Issue

Jingle Tsai
Intellectual 340 points
Part Number: BQ24160

Hi sir,        

                 Regarding to the BQ24160, when the DC power input is 5V and BQ24160 are broken by surge/ESD energy,

                 Could you tell us the internal of IC (for example MOS or dc/dc converter) are open or short?

                 It means that IN was opened to the SW or IN was shorted to SW , when the BQ24160 are broken by EOS?

BR,

Jingle 

  • 0
    TI__Guru**** 166446 points
    Jingle,

    There are two FETS from IN to SW. Q1a (not shown on block diagram) is the reverse blocking and input current sensing FET. Q1b Is the high side buck FET. Both of those FETs are 20V FETs. The low side buck FET, Q2 is a 12V FET. If the buck converter is running, EOS on IN up to 20V will most likely cause Q2, the low side FET, to short. If EOS is above 20V then Q1a will likely short. I do not have statistical data to support this and so cannot warranty this.