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BQ24400: Typical application in Automotive

Ho Scorpio
Prodigy 60 points
Part Number: BQ24400
Other Parts Discussed in Thread: BQ25172, BQ25171-Q1

Tool/software:

Hello

      BQ24400 MAX Vin only 7V, is there another solution up to 12V

1. Application: Backup battery for Automotive  e-call system ( telematics, GNSS, eSIM)

2. Vcc source: CAR battery (12V)

3. Ni-MH battery

  • 0
    TI__Guru** 104905 points

    Hello Ho,

    The suggested device would be the BQ25172 for this type of application and requirements. If automotive rating AEC-Q100 is required the BQ25171-Q1 can be used.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 60 points

    Hi Keller

         According to the Table 7-2. VSET Pin Resistor Value Table in BQ25171-Q1 datasheet, output voltage for 4 cell NiMH is only 4.35V.

    The description on the battery is ''NiMH AA1200mAh-S 4.8V", it seems like that 4.35V is not enough.

    Scorpio

  • 0 in reply to Ho Scorpio
    TI__Guru** 104905 points

    Hello Ho,

    Can you clarify which section in the datasheet you are referencing? The BQ25171-Q1 does not charge to a specific voltage when configured for NiMH charging, it uses the timer based method. The timer is set and described in section 7.3.1.2 CHM_TMR Pin Detection of the datasheet.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 60 points

    Hi Keller

        The Table 7-2. VSET Pin Resistor Value Table is place on page 18, and the section is 7.3.1.3 VSET Pin Detection

  • 0 in reply to Ho Scorpio
    TI__Guru** 104905 points

    Hello Ho,

    Due to the U.S. holiday our response will be delayed, we will respond by end of day tomorrow CST.

    Sincerely,

    Wyatt Keller

  • +1 in reply to Wyatt Keller
    TI__Genius 15205 points

    Hi Ho,

    The L+ configuration column of table 7-2 is only relevant if you select one of the L+ options for CHM_TMR (table 7-1). If you select an NiMH chemistry setting for the CHM_TMR, then you should look at "NiMH Configuration" column for table 7-2.

    Best Regards,

    Juan Ospina