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bq25890

p karunakar
Prodigy 150 points
Other Parts Discussed in Thread: BQ25890, BQ25895, EV2400

Hello,

I read datasheet and few queries are there,

1.—The device supports MaxCharge™ handshake  when MAXC_EN or HVDCP_EN is set.
Usecases are not cleared and Maxcharge algorithm is not mentioned in datasheet.
2. IN BQ25890 EVM board test procedure says
"—PMID J2 connector-Used for boost mode verification "
But boost verification is done via USB.So why J2 Connector is required?
3.BQ25890 IC can charge upto 5A but input current is limit to 3.25A.How this is done?
During battery charging if USB host device is connected then Whether BQ25890IC can deliver 5A for charging battery and for USB host device?
Thank you.
  • TI__Guru**** 166626 points
    Regarding 1, MaxCharge is a TI algorithm that was intended to work with adapters having TI MaxCharge chips. Unfortunately, the adapter group at TI has not yet released a MaxCharge adapter.
    Regarding 2, the EVM is also used for the bq25895 power bank charger which provides OTG boost mode at PMID not VBUS.
    Regarding 3, you would need a higher input voltage than 5V (just under 7V) to reach 5A charge current.
  • in reply to Jeff F
    Prodigy 150 points
    Hello Jeff,

    Thanks for info.
    1.So USB otg can be connected to pmid j2 connector and USB port correct?
    2.For fast charging e.g 12V ,3.2A input can charge battery minimum with 5A?during this time internally whether whether boost mode is activated?
    3.For BQ25890EVM which USB interface is required? In below page
    www.ti.com/.../bq25890evm-664 suggest for EV2300 or EV2400.
    Whether EV2300 sports for BQ25890EVM? because it only tells communication port support for (SMBus or HDQ) . Whether I can go ahead for this USB interface board.

    Thanks.
  • in reply to p karunakar
    TI__Guru**** 166626 points
    Regarding 1, for the bq25890 USB OTG connects to VBUS. For the bq25895, USB OTG connects to PMID.
    Regarding 2, 12V and 3.2A input can provide 5A charging current. Boost mode is NOT active during charging.
    Regarding 3, either the EV2300 or EV2400 can be used to communicate with the EVM. If using the EV2400 on older EVMs, you will need to disconnect the 4th wire, labeled /CE on the EVM, because the EV2400 active pulls that line high with disables charging.