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BQ25060: Charge complete operation

Hidekazu Someno
Expert 5130 points
Part Number: BQ25060
Other Parts Discussed in Thread: BQ24040, , BQ24074

Hi, team,
The following is described on page 12 of the data sheet. I have some questions about this description. Please tell me about them.

=== Description on Datasheet_Page-12 =================================================================
Normal CC / CV Mode
--------
Once the "input current "falls below the termination threshold (ITERM), BGATE is turned off and CHG goes high impedance.                                                        The system output is regulated to 4.2V and the battery is disconnected from OUT, however supplement mode is still available.
================================================================================================


Q1: Does "INPUT CURRENT" in this description mean the VIN terminal current (IIN)?

If the answer to Q1 is yes, then
Q2: Normally, the charge IC judges the charge stop when the charge current of the battery falls below ITERM.
However, In case the IC determines that charging is complete when “Input Current” falls below “ITERM”,
If the load current on the system side is more than ITERM, I think that the IC can not judge that charging is complete even if the battery is fully charged.

What do you think about that?

Moreover, since this product also has no charge timer function, it can not stop charging.

Best regards,

H.Someno

  • 0
    TI__Guru 65706 points
    Hello
    The BQ25060 is similar to the non power path parts such as BQ24040, system and battery will share the single output. But BQ25060 has the option to disconnect the battery after charge and power system from input. With a full power path device the battery and system load are separate.
    In the BQ25060 and non power path devices system current and charge current are mixed. This should be take into account when selecting the device and how termination current will be detected. Use case will vary from product to product, many devices are not used during charging.
    Also see page 13, Programmable Input Current Limit (ISET) discusses the setting of termination current with a system load.
    If the system load current during charging presents problems a power path device such as BQ24074 or similar may be a better fit.