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BQ24630

Quang Truong
Prodigy 20 points
Other Parts Discussed in Thread: BQ24630

I'm building up some prototype boards using the BQ24630.  I have 1 set of board working perfectly using similiar components recommended on the datasheet, but the other 4 boards don't seem to work at all.  All signals measured are within spec., except the REGN pin.  The good one has REGN of about 6V, but the bad ones have only about 0.5V.  Any reasons why REGN is low? Thanks.  

  • 0
    TI__Mastermind 31120 points

    Check the other pins of the IC...sleep mode, CE pin,  If they are out of range, the IC may be disabled.

  • 0 in reply to Charles Mauney
    Prodigy 20 points

    Below are my measurements on the pins.  They seem to be within spec., except for REGN and BTST. The STAT1 and STAT2 indicate that the IC is in one of these modes: Charge suspend, timer fault, overvoltage, sleep mode, and battery absent.   Is there something else I should measure?  Thanks again.

    ISET1:  0.597V

    ISET2:  0.295V

    ACSET: 0.802V

    VREF: 3.290V

    VCC: 18.26V

    ACP: 18.26V

    ACN: 18.26V

    TS:  2.148V

    CE: 3.28V

    TTC: 1.26V (0.11uF cap)

    VFB: 1.35V

    REGN: 0.5V --->low

    BTST: 0.6V --->low

    STAT1: HIGH

    STAT2: HIGH

    PG: LOW