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BQ24073: What are the consequences if the charge current limit is 1A and the power supply is 500mA?

downey KIM
Intellectual 600 points
Part Number: BQ24073

Hi, TI team.

My customer will design battery charger for 2600mA battery.

BQ24073 can set current limit by 1.5A.

Test condition

DC power supply : 5V, 500mA

BQ24073EVM : charging current 1A. (external setting)

Result : DC power supply voltage dropped to 4.4V.

When the charging current limit of BQ24073 is set to 1A, If user will use 500mA DC adapter, Is DC adapter possible to be damaged?

  • 0
    TI__Genius 13725 points

    Hi,

    There is Vin_DPM feature in BQ24073 to protect poor AC adaptor  power source.

    in datasheet's specification the VIN-DPM: Input voltage threshold when input current is reduced  4.5 V (typical)

    As for is DC adaptor possible to be damaged, I think it is depended on adaptor's design. As I know, during DPM condition, adaptor should be in over loading condition, so it may cause thermal ramp up possible.

    So if your adaptor power rating is 500mA then I will suggest you program BQ24073's input current limit to 500mA.

    Thank you and Regards

  • 0 in reply to Paul Yeh
    Intellectual 600 points

    Hi, Paul

    Thanks you for reply.

    My customer do not provide DC adapter to buyer. they sales only Robot for Education.

    Therefore, designers do not know what power source is used by the robot purchasers. (ex : 5V 0.5A, 1A, 1.5A, 2A??)

    But designers hope to set current limit 1A for fast charge. (Because it requires a long time to complete charging when charging to 0.5A.)

    Is Vin_DPM mode set automatically? 

    Does this have anything to do with the EN1 and 2 pin settings?

  • 0 in reply to downey KIM
    TI__Genius 13725 points
    Hi
    No, this part is fixed Vin_DPM.
    Thanks