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BQ25882EVM-001: Function of D7

PAN-M
Mastermind 8375 points

Part Number: BQ25882EVM-001

Dear all.

What is the function of D7 of EVM?
When there is this diode, I think that a current flows through SYS from BAT when BATFET is off.

Best Regards,
PAN-M

  • 0
    TI__Genius 16245 points

    Pan,

    I think this diode is helping to share BATEFT power dissipation if high discharge current condition, And it is especially helpful during BATFET fully on period.

    In real design case, I think you can save this diode.

    I also show chip block diagram for your reference then you can see D7 is just parallel with BATFET's (Q4) body diode.

    Thanks


  • 0 in reply to Paul Yeh
    Mastermind 8375 points

    Paul

    Thank you for reply.
    How about at the time of BATFET off?
    I am understand when it do not have any problem at On.
    However, when BATFET is Off, the battery voltage is low or thinks that charge is disable.
    I think the leak current is small when only an internal body diode.
    I think the leak current is small when only an internal body diode, but the Schottky diode is too big.

    Pls. teach me this point.

    Best Regards,
    PAN-M

  • 0 in reply to PAN-M
    Mastermind 8375 points

    Hi Paul

    How about this?

    PAN-M

  • 0 in reply to PAN-M
    TI__Genius 16245 points
    Pan,
    Sorry for delay response.
    Yes, for quiescent current specification during Battery only mode, it is 11.5uA (typical. value), it is small.
    Thanks
  • 0 in reply to Paul Yeh
    TI__Genius 16245 points
    Hi there,
    We haven’t heard back from you. We are assuming you were able to resolve your issue. If not, just post a reply below or create a new thread if the thread has locked due to time-out.
    Regards,