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  • TI Thinks Resolved

BQ29200: bq29200

Intellectual 730 points

Replies: 7

Views: 468

Part Number: BQ29200

Hi,

Can i connect BQ29200 as my schematic ?

Does it work during the charge of the batteries and also during the discharge ?

Can i have it  always enable ?

Thanks

Mario.

BQ29200-CIRCUIT.pdf

  • Hi Mario,
    The bq29200 is expected to be connected to the cells at all times. It operates both during charge and discharge. Its over voltage detection is always enabled. The cell balancing can be enabled by a circuit such as an MCU as you show. When enabled the bq29200 will balance when the voltages differ by more than the threshold, they do not check for charge or discharge. Since the cell voltages may deviate more toward the end of discharge, you may want to disable balancing when the voltage is low.

    "Please click "This resolved my issue" button if this post answers your question"

    TI provides design resources and design advice (including technical, schematic, code and/or system review) “as is” and with all faults.  All information in this or related correspondence is provided subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).

  • In reply to WM5295:

    BATTERIA RS PROTETTA.pdfHi.

    Can i still use bq29200 with lithium battery pcb protected  ?

    Thanks.

    Mario.

  • In reply to mario soccini:

    Hi Mario,
    The bq29200 is a secondary protector but it expects the cells to be always attached. If the bq29200 was connected to the protected cell and it protected from UV with a load the voltage would reverse on the inputs to the bq29200 for the protected cell. This would violate the abs max rating and is not recommended.

    "Please click "This resolved my issue" button if this post answers your question"

    TI provides design resources and design advice (including technical, schematic, code and/or system review) “as is” and with all faults.  All information in this or related correspondence is provided subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).

  • In reply to WM5295:

    Hi.
    I don't understand sorry... therefore i can't use it...i wanted attach the schematic but i don't see how to do ...i see only tag ..however i have a charger then 2 series battery (8.2V) and i wanted to put the bq29200 parallel to batteries..
    Mario.
  • In reply to mario soccini:

    Hi Mario,

    If the cell protected during charge the bq29200 would likely be safe since the charge voltage is 8.2V.  The concern is when the battery protects from a current or under voltage condition with load, the voltage will reverse to the inputs.  See the markup on the original schematic below.

    "Please click "This resolved my issue" button if this post answers your question"

    TI provides design resources and design advice (including technical, schematic, code and/or system review) “as is” and with all faults.  All information in this or related correspondence is provided subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).

  • In reply to WM5295:

    Hi.

    I will use normal 18650 battery… in attached my schematic e battery datasheet...in order to be complete about safety what else i would have to add ?

    For example ..something about against inversion polarity...does it exist ?BATTERY POWER.pdfbattery datasheet.pdf

    Thanks.

    Mario.

  • In reply to mario soccini:

    Hi Mario,
    What protections you need depends on your system requirements from your industry or system architecture. Many systems will use FETs to cut off the charge or discharge when the battery is operated outside the parameters set by the battery system designer. In our product line when protection is needed on a single cell it is may be provided by the bq2970 which will operate like your protected cell. When 2 cells are needed to be balanced and UV and current protections are handled in another circuit the bq29200 is available although the OV thresholds are more of secondary levels. When 2 cells need full featured protection the band balancing are needed with 2 cells it comes with a gauge such as the bq28z610, bq4050 or bq40z50-R1. The bq29200 could still be a secondary protector if desired but the balancing would not be needed and there are other options for a secondary protector.

    "Please click "This resolved my issue" button if this post answers your question"

    TI provides design resources and design advice (including technical, schematic, code and/or system review) “as is” and with all faults.  All information in this or related correspondence is provided subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).

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