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PRODUCT SELECTION- BQ24161 Battery Charger

Other Parts Discussed in Thread: BQ24161

Hello Team,

We are Planning to use BQ24161 Battery charger for charging 3.7V, 1050mAh Li-ion battery, by USB and External DC jack.

As we explore BQ24161 seems to be suitable for our application, we have few query listed below before selecting this Charge controller.

1. what if user connect USB and AC adapter simultaneously? any protection is require for this?

2. If both power source (USB & AC adapter) is connected simultaneously,  from which power source battery will  start charging?

3.  Is BQ24161 charge controller good for 3.7V, 1050mAh battery charging?

Thanks & Regards,

Mitul Tank

  • Hi Mitul,

    Regarding 1&2, no protection is needed if both inputs have power connected. The default priority is for the IN input. The user can change the priority by writing to Reg00 B3.

    Regarding 3, for dual input charging of a 3.7V battery, bq2416x is a good family of chargers. Please keep in mind that its default VBATREG is 3.6V. The host processor must continuously update the watchdog timer bit in order for the VBATREG to remain at 3.7V (as well as change USB to priority).

    Please me know if you have further questions.