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BQ24075 vs BQ24075T - What are the differences?

Matthew Day
Mastermind 36110 points
Other Parts Discussed in Thread: BQ24075, BQ24075T

What are the differences between the BQ24075 battery charger and the BQ24075T ? 

  • 0
    TI__Mastermind 36110 points

     BQ24075  uses a current source to drive the NTC Thermistor connected to the TS pin.  The bq24075T uses a voltage source to drive the NTC Thermistor connected to the TS pin.  The end result is the same however, the voltage source gives you more flexibility.  The the voltage based TS (T version) allows the user to scale the thermistor to use any value 10k, 100k, 50k, where as the current version only uses the 10k NTC at 25C.

  • 0 in reply to Matthew Day
    Genius 4135 points

    Hi,

    I want to know the following contents.

    Q1. What is the reason which needs R8 of the monitoring function of BQ24075T?

    Q2. How much is the parasitic capacitance of TS pin ?

    Regards,

    Seishin

  • 0 in reply to Seishin
    TI__Guru**** 165986 points

    Regargind Q1,

    The TS pin is only rated for 7V.  If the value of R6 is less than 100kΩ , R3 must be added to form voltage divider that protects the TS pin from 28V inputs. If R6 is greater than 100kΩ, R8 does not need to be used.

     

    Regarding Q2, we have not characterized the capacitance of the TS pin.  Typically, similar pins are in the 10pF range.

  • 0 in reply to Matthew Day
    Prodigy 10 points

    hi

    i am using this BQ24075TRGTR  adn is working at the moment.  but i bought a wrong part BQ24075RGTR.  and am using the same circuit for the BQ24075TRGTR.

    how can i modify the circuit to get it working ?   i have pulled Ts down to Vss.  with a 10 k resistor .   do i have to change anything else to get it charging ?

    TD  at high or low ?