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Original question:

BQ24133EVM-715-15V: BQ24133EVM-715-15V

BQ24133: BQ24133

Manish Poojary1
Prodigy 60 points
Part Number: BQ24133
Other Parts Discussed in Thread: , BQ25713

Hi,

I am using your BQ24133 IC for our requirement i.e. Vin= 12 V, Vbatt=12.6(3 batteries in series) and my system will run at 12 V and 2 A .

I am taking reference of Your evaluation board of BQ24133EVM-715-15V. Please suggest important changes to achieve my requirements since i am following schematics of BQ24133EVM-715-15V therefore it would be easy if you suggest changes taking references designators in BQ24133EVM-715-15V accordingly.

  • 0
    TI__Guru**** 165886 points

    Hi Manish,

    The BQ24133 is a buck only charger.  Therefore, you need VIN > VBATT=12.6V in order to fully charge 3 series batteries.  Can you increase your input voltage or lower to 2 batteries in series?  If not, then I recommend changing to BQ25713, which is a buck and boost charger.  It requires host software control through I2C.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Prodigy 60 points

    if my Vin =12V , will my 3 series battery will get charge upto 12V, as i am ok with this voltage too for my system?

    also please explain the use of TS_EXT, should i ground it or NC. And why the pin numbers and respective pin descriptions of BQ24133 and its evaluation board -bq24133EVM is different?

  • 0 in reply to Manish Poojary1
    TI__Guru**** 165886 points

    Hi Manish,

    If 12V works for your system, then I see no issue except the charger will never report charge complete as the voltage will never reach 12.6V.

    Regarding the EVM's TS_EXT trace, the EVM allows you to connect an external thermistor or use the on EVM 10kohm resistor to simulate the thermistor with JP1.

    Regards,

    Jeff