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BQ24617: Battery plug in issue:IC get damaged

stalin Joseph
Prodigy 70 points
Part Number: BQ24617
Other Parts Discussed in Thread: BQ24600
Hello all,
We are using BQ24617 TI IC for charging purpose in our upcoming product.In which we are facing problem with BQ24617 IC, while connecting battery to the charging circuit.The BQ24617 IC used  for charging 14.8V 1800mAh LiPo battery(4 cell) at a charge rate of 1A.
while connecting battery to the charging circuit,the following problems happening in our circuit ,which cause battery terminal shorted.
  • The 18(REGN),20(PH),21(HIDRV) pins are getting shorted with 17(GND) pin,sometimes BTST pin also get shorted with GND.
  • The LODRV mosfet (SIS412DN) terminal also damaged
The supporting components are used as per the datasheet only.Previously we use BQ24600 IC for charging our battery with same charge rate,in which also we face the same battery plug in issue.
Please help us if anybody knows the solution.
Thank you
Stalin P Joseph
  • 0
    TI__Genius 10640 points

    Hi Stalin,

    There are something need your help,

    1. Could you provide your schematic for us? 
    2. Is there any waveform before/after this issue? Or could you duplicate this issue and capture waveform for us?
    3. Besides REGN, PH, HIDRV,BTST and low side MOSFET, is there any other pin or component damaged? How about the high side MOSFET?

    Thanks,

    Ann Lien

  • 0 in reply to Ann_Lien
    Prodigy 70 points

    SCHEMATIC_BATTERY CHARGING CIRCUIT.pdfSchematic and other waveforms with and without input power supply and connected battery attached here as per your reply.The HIDRV mosfet OR pin not getting damaged.And there is no possibility to get waveform after dupilcating the issue as the IC pins shorted with the GND.

  • 0 in reply to Ann_Lien
    Prodigy 70 points

    other waveforms are,

  • 0 in reply to stalin Joseph
    Prodigy 70 points

    Hi Ann,

    The uploaded waveform name is mentioned as name of each image. Please save the image to know the waveform pin details. And the circuit battery terminal short happens after couple of cycle charging only. It is not happening when we plunging battery first time to the battery terminal. We are looking forward to your response

    Thank you

    Stalin joseph

  • 0 in reply to stalin Joseph
    TI__Genius 10640 points

    Hi Stalin,

    Thanks for your data collects.

    For your schematic,you need to setup ACP/ACN, ISET2, ACSET to let charger work normally. Has this design ever worked normally when this issue didn't come? If you don't want to use input current limit and too much output component, you can use bq24600 to replace bq24617.

    How about your system connection? It is connected to battery or Vin? It determines battery's inrush current direction.

    How often this issue occurred? Every time you plugged the battery or it is random?

    The damaged is related to bootstrap circuit. Is bootstrap diode good or damaged?

    Thanks,

    Ann Lien

  • 0 in reply to Ann_Lien
    Prodigy 70 points
    Hi Ann,
    Thanks for your reply. As per your questions,

    Q) For your schematic,you need to setup ACP/ACN, ISET2, ACSET to let charger work normally. Has this design ever worked normally when this issue didn't come?
    Ans) This charger ckt as per our schematic worked very fine on some boards with same configuration. Actually we went for BQ24600 first time, in that circuit also we got the same issues. The BQ24600 circuit was designed as per the datasheet only without any changes. We also refer the BQ24600 EVM layout for our layout designing. Because of continuous failure we come across BQ24617.we customised the BQ24617 IC circuit as per BQ24600 as we dont want input current limitation and so much protection on input power supply side. Besides we also tried the actual BQ24617 circuit which also give us the same issue.
    Q) How about your system connection? It is connected to battery or Vin? It determines battery's inrush current direction.
    Ans) The system connection is from battery connecting terminal only.
    Q) How often this issue occurred? Every time you plugged the battery or it is random?
    Ans) This issue occurs randomly on some boards. And it is not happening every time I plug the battery to the battery connector.
    Q) The damaged is related to bootstrap circuit. Is bootstrap diode good or damaged?
    Ans) The bootstrap diode is good after the issue. We are using BAT54C as bootstrap diode which is mentioned on the BQ24617 datasheet.Later we replace the bootstrap diode with ZLLS350 which is used as bootstrap diode in BQ24617 EVM Boards, but the issue exists with the ZLLS350 too.But anyways bootstrap diode is not getting damaged after the damage of circuit.

    Thank you
    Stalin Joseph
  • 0 in reply to Ann_Lien
    Prodigy 70 points
    Hi Ann,
    There is one query link pasted below which says the same issue faced with the BQ24600 series IC. I think this may give some resources regarding our issue. e2e.ti.com/.../606089

    Thank you
    Stalin Jospeh
  • 0 in reply to stalin Joseph
    Prodigy 70 points

    Hi Ann,

    Is there any solution,  as the local TI support members are insist to stick with global forum for problem resolution. Please give us better way to solve the issue as we are on the stage of production of our device.

    Thanks you

    Stalin Joseph

  • 0 in reply to stalin Joseph
    TI__Genius 10640 points

    Hi Stalin,

    Sorry for the late reply.

    We're trying to give a explanation on this case. in order to speed up the support, you can email me through ann_lien@ti.com.

    Thanks,

    Ann Lien

  • 0 in reply to Ann_Lien
    TI__Genius 10640 points
    Hi Stalin,

    I'm handling this issue now. We can discuss more detail through email. I cannot find the mail address from your E2E profile. Could you send me a mail through ann_lien@ti.com? I can explain more to you.

    Thanks,
    Ann Lien