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Original question:

BQ24002: BQ24002 input current

BQ24002: input current and charging process

user5850523
Prodigy 150 points
Part Number: BQ24002

Thank you for your reply
I also want to ask,
1 According to the typical application circuit diagram, both the IN pin and the VCC pin are connected to VCC, so if the VCC input is 5V / 0.5A, a voltage of 5V flows into the VCC pin and a 0.5A current flows into the IN pin.

2 Regarding the charging process, if the battery voltage is less than lowV, pre-charge is started for 22.5min, and the charging current is 60mA + -20mA. If the voltage is greater than lowV and less than overv, constant current charging is started, and the charging current and input current are consistent with 0.5A, charging Constant voltage charging starts at 4.2V. Is this correct?

3 If I want some charging chip with low input current but high output current, is there such a charging chip?

  • 0
    TI__Guru* 75906 points

    Hello

    We can assist with the question, but the same question in posted in two location this post and the below post. Do you wan to close the original post?

    e2e.ti.com/.../864510

  • 0 in reply to Bill Johns
    Prodigy 150 points

    thank you

    I close the original question.

    I desire your reply.

    best wishes

  • 0 in reply to user5850523
    TI__Guru* 75906 points

    Hello

    1 According to the typical application circuit diagram, both the IN pin and the VCC pin are connected to VCC, so if the VCC input is 5V / 0.5A, a voltage of 5V flows into the VCC pin and a 0.5A current flows into the IN pin. --- Bill J -- Yes, also note that the current sense resistor on this device is external (Fig 13 - R1), voltage across R1 is measured between VCC the ISNS pin for regulation of current.   

    2 Regarding the charging process, if the battery voltage is less than lowV, pre-charge is started for 22.5min, and the charging current is 60mA + -20mA. If the voltage is greater than lowV and less than overv, constant current charging is started, and the charging current and input current are consistent with 0.5A, charging Constant voltage charging starts at 4.2V. Is this correct? -- Bill J -- Yes

    3 If I want some charging chip with low input current but high output current, is there such a charging chip? --- Bill J -- Can you explain this a little more?  TI has Linear chargers such as BQ24002, input current will be the same as output current.  Also have switching chargers, typically Buck converters that are higher efficiency. 

  • 0 in reply to Bill Johns
    Prodigy 150 points

    thank you for your reply
    I want to inquire whether there is a charging chip with a relatively small input current, about 10mA, and a large output current, about 60-100mA.
    Or a boost chip with 10mA smaller input current and 200mA larger output current?
    Best wishes

  • 0 in reply to user5850523
    TI__Guru* 75906 points

    Hello

    We have other devices that may fit your application. 

    Could you describe your application and how the battery charger will be used.  The description with limited input current of 10mA suggests that input source is possibly a solar cell or energy harvester. 

    What is battery voltage ?

    The input power of the system will need to balance also, input current of 10mA and output current of 200mA will require a high input voltage at low current.

  • 0 in reply to Bill Johns
    TI__Mastermind 21590 points

    Hello,

    Any updates here?

  • 0 in reply to Raheem
    TI__Guru* 75906 points

    Hello

    Have not heard back from you, hope the problem is resolved.  I will close the post for now and we can open it later if more assistance is required.