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BQ24202: Charging cell phones

Ali Ozhan
Prodigy 40 points
Part Number: BQ24202
Other Parts Discussed in Thread: BQ24196, , BQ24076, BQ25616

Hello, 

I am planning to use BQ24202DGN  as phone charger for a project.

In the data sheet it says it provides current up to 500mA. If i connect any iphone and android phone does it provide 500mA. or 100mA ?

Do i need to do anything else with D- or D+. Or just shorting them would be enough ? 

Input vould be 16V /5A adapter. I don't want to provide more than 500mA, so it fits my design requirements 

Thank you

  • 0
    TI__Genius 12485 points

    Hi Ali,

    You might look into if the MCU can terminate the D+/D- connection. 

    When you say 16V adapter are you trying to charge at the 16V range? One thing to design for is the thermal rise on the chip. 

    The Power dissipated = (VIN-VBAT)*IBAT. 

    You might look into a switching charger like the BQ24196 if that is the case. The ILIM pin is to set the input current (adaptor output current) limit. REG02 is to set the charging current.

    Regards,

    Gautham

  • 0 in reply to Gautham
    Prodigy 40 points

    Hi Gautham, 

    Thanks for your response. 

    I am using 12V adapter as a power source. And there will be 14 stations for charging purpose. I want to limit each station for 500mA.

    I am not planning to communicate with the device. This project will be just for charging the devices. I was planning to limit the current at Max 500mA.

    I saw some posting that i can do this with adjusting voltage values on devices D- , D+ ports. If there is nothing connected would it be only 100mA .

    which of the following would you recommend for this purpose, or something else.

    BQ24202

    BQ24196 

    BQ24076

    Thanks again

  • 0 in reply to Ali Ozhan
    TI__Genius 10240 points

    Hi Ali,

    You can check out the BQ25616 if the adaptor is 12V. The D+D- is used to detect USB adaptor type, not to detect the adaptor's presence. 

  • 0 in reply to ezhao
    Prodigy 40 points

    Hi Eric,

    Thanks for your response. Just to clarify , if i want to set the charging current at 500mA, i need to do this with ICHG  pin.

    In this case , regardless of a vendor ( apple - Samsung )  , will it be charged by 500mA charging current, even with USB detection. 

    Since my power supply has a limit , i don't want the charge current more than 500mA.

    If i don't connect D- and D+ , will the charging current always 100mA ?

    Since the expected value will be high , is there any cheaper option?

    Regards

    Ali

  • 0 in reply to Ali Ozhan
    TI__Expert 5590 points

    Hi Ali:

    Yes, if you set ICHG=500mA, the charge current is fixed no matter what adapters are detected by D+/D- and as long as the adapter current capability is higher than 500mA. If you do not connect D+/D-, the input charge current is limited by ILIM pin resistance. The charge current is still programmed by ICHG pin. 

    Regards,

    Hong