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I need a Li-ion battery charger solution which charges the battery as well as give fixed 4.2V or less to the load whil charging.

prakash bharti
Prodigy 40 points
Other Parts Discussed in Thread: BQ25620, BQ25616

Hi TI Team,

              I am in search of Li-ion battery charger solution with below specifications:-

1. 2A charge current max for Li-ion battery.

2. It should get charged from USB or 5V adapter.

3. When charging from USB/5V-adapter the battery should be charged simultaneously as well as give output voltage of 4.2V or less which is connected to load.

4. When USB is unplugged than battery should act as a source.

I am also attaching a block diagram for reference.

Block Diagram-rechargeable.pdf

Thanks & Regards,

Prakash

  • 0
    TI__Guru**** 165766 points

    Hi Prakash,

    For host controlled through I2C charger, take a look at BQ25620.

    For standalone charger, take a look at BQ25616.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Prodigy 40 points

    Hi Jeff,

        Thanks for the suggestion for BQ25616. There are some queries listed below:-

    1. Maximum voltage at SYS pin in any condition while charging from USB/AC adapter-5V or Battery as a source will not exceed 4.35V?

    2. SYS pin will be my load connect pin? 

    3. I don't want to use boost mode in BQ25616. How to disable it?

    4. My load is celluar module(GSM+GPS) and WiFi module. Should i operate the BQ25616 in light load for better efficiency?

    5.What REGN pin do?

    Thanks & Regards,

    Prakash

  • 0 in reply to prakash bharti
    TI__Guru**** 165766 points

    Hi Prakash,

    Regarding 1, yes with default output capacitor and minimal load transients on SYS.  If you have large > 3A transients on SYS, you might need to add more capacitance on SYS to minimize transient spikes.

    Regarding 2, yes.

    Regarding 3, boost/OTG mode is not enabled by default so you don't need to do anything.

    Regarding 4, yes.

    Regarding 5, REGN is the output of the linear regulator that powers all of the internal circuits but also provides a voltage for the external resistor divider on TS that is in parallel with the battery thermistor.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Prodigy 40 points

    Thanks a lot Jeff.

    This resolved my query.