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BQ25121A: Battery charging IC with LDO with 3.3V output

Romario Pashollari1
Prodigy 80 points
Part Number: BQ25121A
Other Parts Discussed in Thread: MSP430FR2476, BQ24232, BQ25155

I am looking for a battery charging IC with an LDO similar to the BQ25121A. 

  • I have a 3.7V Li-Ion battery that needs to be recharged at 4.2V at 250mA
  • The IC needs to support USB charging and powering the host system at the same time
  • Will be delivering power to a MSP430FR2476 which runs at 3.3V
  • Preferably provides some information on the state of the battery such as level of charge remaining
  • Does not use the BGA package.

Basically, the BQ25121A can provide what we need, except it comes in a BGA package which I would prefer not to use. 

Thank you

  • 0
    TI__Mastermind 21590 points

    Hello,

    Currently, the chargers we have that can report battery voltage or level are the BQ2512x family and BQ25155. Both of which are WCSP package. The BQ24232 can be used to charge but you'll need a gauge to determine state of charge.

  • 0 in reply to Raheem
    Prodigy 80 points

    According to the datasheet, Vout on the BQ24232 is 4.4V while Vbat is 4.2V. I am wondering if there is a device like the BQ24232 that can be used to power a device like the MSP430 directly which requires 3.3V. Would I have to use a separate LDO between this and the MSP430 to be able to power it at 3.3V?

    Thank you

  • 0 in reply to Romario Pashollari1
    TI__Mastermind 21590 points

    Hello Romario,

    If using devices like the BQ24232, you'll need a buck converter to get 3.3V.

    If you dont mind me asking, why do you not like the BGA of the BQ25121A? Is it because of the In-pad vias?

  • 0 in reply to Raheem
    Prodigy 80 points

    Thank you very much for your help. 

    I am hesitant about BGA chips because I am working on a time sensitive project. I want to print a PCB out to test this circuit, however printing anything with more than 1 layer using the setup I have requires me to align the other layers myself. Basically, I'd like the product to be easy to solder which BGA is not. U have chosen to use the BQ24232 alongside a LDO for my application.

    Thanks again