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BQ25100: Any influence from Riset when PRE-TERM pin is left floating?

AnBer
Mastermind 30170 points
Part Number: BQ25100
Other Parts Discussed in Thread: BQ25101

Team,

PRE-TERM can be left floating so that the current is set to the default one given in the BQ25100 datasheet (SLUSBV8C page 6 - see below picture).
Those min/Typ/Max specs are given for Riset = 2.7kOhm.
-Is there any deviation in current when Riset is different?
-Do we have a curve showing the deviation/error for the Riset recommended range (Riset: 13.5 kΩ (10 mA) to 0.54 kΩ (250 mA))?

In this use case the battery is a 20mAh battery. Iout would be 11.25mA (ie using a 12kOhm Riset)) and the goal is to have 10% of Iout for TERM and 20% of Iout for PRE-CHARG.
-Any specific consideration for this scenario to have a closer look (like behavior at different temperature, Resistor tolerance, ..etc)?

Thanks in advance.

A.

  • 0
    TI__Guru* 75876 points

    Hello

    The behavior or tolerance of the Pre-charge an termination will not be changed by Riset value.  The percentage range in the data sheet will apply above and below the 50mA range (2.7k) noted above.

  • 0 in reply to Bill Johns
    TI__Mastermind 30170 points

    Hi Bill,

    Thanks for the confirmation.

    1) Just to be sure I understand correctly the BQ25100 datasheet:
    Am I correct to assume that the %PRECHG and %TERM Iout specs (max/min) are valid for the complete range of R_iset value we recommend (Riset: 13.5 kΩ to 0.54 kΩ)?

    In our case (for R_iset = 12k) the %PRECHG and %TERM Iout specs (max/min) would be very close to the value we have in the datasheet. Correct?

    2) For BQ25101:
    On BQ25101: Pin C1 is the /CHG output
    On BQ25100: Pin C1 is the PRE-TERM input

    For BQ25101 does it mean that?
           -PRECHG and TERM are using the default % Iout specs max/min (see previous picture)
           -/CHG can be used additionally (as described in this post).

    Thanks in advance!

    A.

    Thanks.

    A.

  • 0 in reply to AnBer
    TI__Guru* 75876 points

    Hello

    Question 1 -"Am I correct to assume that the %PRECHG and %TERM Iout specs (max/min) are valid for the complete range of R_iset value we recommend (Riset: 13.5 kΩ to 0.54 kΩ)?" -- Yes

    Quesiton 2 -- Yes.

    We can discuss this further using email.