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General Battery Charging Queries

Genius 5355 points
Other Parts Discussed in Thread: BQ25700A, BQ25703A, BQ24392, BQ24050, BQ25895, BQ25890

Hi Support,

On the PMP5722 reference design:The thermistor seems to be monitoring the temperature of the battery during the charging phase and is sensed by the charging IC. Is there monitoring of the battery temperature during discharging phase in this reference design?

On BQ25703A or BQ25700A, it supports USB 2.0, USB 3.0, USB 3.1 (Type C), and USB_PD power source to perform battery charging, how is the detection of the different USB charging protocols done from the charging IC end? Is there another part with a smaller package/size that supports the above similar charging protocols?

BQ24392 detects the BC compliant adapter. A host is required to interface with BQ24392 to control whether a high or low charging current is to be supplied for charging?
Is there a solution that is standalone and does not require a host?

BQ24050 allows USB charging on 100mA/500mA. I suppose a both USB Type C or micro B connector can be interfaced to BQ24050? Type C connector connecting the USB 2.0 signal only.
Can D-, D+ pins on the BQ24050 detect the type of USB connection and set the USB charging current 100mA/500mA automatically?

Thanks.

  • Ikon,

    BQ25703A and BQ25700A support the USB charging in terms of the input voltage level. The charger itself does not conduct detection. You need a separated detection IC for charging protocol negotiation. TI has charger like BQ25890/BQ25895 that perform USB SDP, CDP, DCP, and non-standard
    adapters detection. Please refer to the datasheet Page 19-20 for details.

    BQ24392 is a USB switch with detection function. For the detection purpose there is no need of a host as shown by the detection flow chart on the datasheet P7.

    BQ24050 detection is to check the D+D- short or with pull down resistor to decide the input current is 500mA or 100mA. Please refer to the datasheet Page 16 for details.

    Regards,

    Eric