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BQ24070: Battery is not charging more than 400mA current

SIVA NAGESWARARAO
Intellectual 270 points
Part Number: BQ24070

Hi,

In our design we are using TI battery charging IC(Part no:BQ24070RHLTG4 ).

Our target is to charge battery with 900mA by using 5V,1A adaptor but it is charging max 400mA.

could you please help me to solve this issue.

FYI i am attaching schematics and battery data sheet 

Thanks

sivaULIN102003.pdf

  • 0
    TI__Guru 70796 points
    Hello
    This sounds like the unit is in USB Mode and limiting input current to no more than 500mA. The right combination of MODE pin (LOW) and ISET2 (HI) will set input current to 500mA, See section 8.4.3.1 and Table 2 in data sheet.
  • 0 in reply to Bill Johns
    Intellectual 270 points

    Battery_Hub_Usb Sections.pdfHi John,

    Thank you for your quick reply.

    Test Condition: Device off State 

    Case 1: Charging with Adapter

    when i am connecting adapter this mode is automatically high because we are using charge detection IC(part number BQ24392RSER).

    Observed Mode pin is high when i am connecting adapter to USB(MODE voltage 3.94V).

    Case 2: Charging with USB

    In this case also we observed battery is charging with 200mA only

    For you reference i am attaching full schematics.

    Thanks

    Siva

  • 0 in reply to SIVA NAGESWARARAO
    TI__Guru 70796 points
    A couple of other things to check on:
    1.) Both input and output of the bq24070 are connected to VUSB_OUT, is IN and OUT connected together?
    2.) What is V-IN and V-BAT during charging, possibly low input voltage is a factor?
    3.) Are you seeing any thermal rise on the device?
  • 0 in reply to Bill Johns
    Intellectual 270 points
    Hi Johan,
    please see my response in below
    1.) Both input and output of the bq24070 are connected to VUSB_OUT, is IN and OUT connected together?
    No,Input is connected to VBUS_OUT and Output is connected to VUSB_OUT
    2.) What is V-IN and V-BAT during charging, possibly low input voltage is a factor?
    V-IN is 4.75V ,V-BAT is 3.800V
    3.) Are you seeing any thermal rise on the device?
    No

    I want one more information from you,in one board(not working) i observed V-BAT is zero .




    Thanks,
    Siva