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BQ25570EVM-206: BQ25570EVM 3V output

Part Number: BQ25570EVM-206
Other Parts Discussed in Thread: BQ25505, BQ25570

Dear Sir/Ms.

This is an extension of the problem.

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1042604/bq25570-bq25570-charge-3v-battery?tisearch=e2e-sitesearch&keymatch=bq25570#


The customer's output requirement is 3V not 1.8V.  How to set BQ25570EVM to 3V output? EVM still cannot output 1.8V or 3.0V.Please guide me how to set EVM Jumper. resistance.
Attached is a function block from customer and an Excel configuration file(I discuss with customer).

7673.bq25505(70_Design_Help_V1_3.xlsx

Best Regards,

Kami Huang

  • Hi Kami,

    The VSTOR=VBAT must be higher than 2V since it is a boost converter.  EVM resistors R1 and R2 on VBAT_OV pin set VSTOR=VBAT.  EVM resistors R9 and R10 on the VOUT_SET pin set the buck converter output if used.  The attached xls helps you the closest size resistors with which to replace the EVM resistors.

    Regards,

    Jeff   

  • Hello Jeff,

    I can not see your attached excel file. Would you please give me a private message(Email). The other question how to set up JP1,JP2,JP3,JP5,JP4,JP6.

    Our setting is 

    JP2= close.

    JP3 = VSTOR

    JP6= open.

    JP1=open

    JP4= 50%

    Best Regards,

    Kami Huang

  • Hi Kami,

    Regarding the jumper settings:

    JP1 = open

    JP2=/EN=GND

    JP3=VSTOR

    JP4=80% for solar panel

    JP5= open

    JP6=open.

    I will respond to your other question in private message.

    Regards,

    Jeff

  • Hello Jeff,

    I ask the customer to set the BQ25570EVM according to your suggestion. And ask him to measure the voltage of VOSTOR (J5) and Vout (J11).
    It is found that Vout =1.9V. VOSTOR=3.0V.
    The customer's system (Vsys) needs a 3.0V power supply.
    Can I ask the customer Vsys to connect to VOSTOR?
    Another question is, does BQ25570 have DPPM (Dynamic Power Path)?

    Best Regards,

    Kami Huang

  • Hi Kami,

    The system can be connected to VSTOR.  Or if the system is to be connected to VOUT then VSTOR needs to be at least 200mV higher than 3.0V.

    BQ25570 does not have DPPM.

    Regards,

    Jeff

  • Hello Jeff,

    Let me check you another Question.

    If Vin’s power is insufficient, will BQ25570 automatically draw power from Battery to supply it to Vsys?

    Best Regards,

    Kami Huang

  • Hi Kami,

    Yes.  VSTOR is connected to VBAT through a PFET that only turns off if VBAT<2.0V.

    Regards,

    Jeff