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BQ25619: Is it the right candidate for my application!

SatishKumar SivaSankaran
Prodigy 20 points
Part Number: BQ25619
Other Parts Discussed in Thread: BQ25895

Hello,

I need some help with my component selection for a Li Ion battery charge IC with a dedicated power path for the system. We at Greenlee are not battery experts and this would be our first time designing for a Li Ion battery. Find below our application requirements:

1. Battery: Single cell Li Ion 1S1P; 3.6V, 2.9 Ah (Max fast charge current: 1.5A)

2. System load 150~250 mA

3. Input power: Single USB type C connector.

Host device is required to identify the current input source and modify current limit accordingly. Additionally, battery temperature and battery charge status need be identified by the host device.

Based on these limited specification, what is my best option between BQ25619 and BQ25895.
Any help is much appreciated.

-Satish

  • 0
    TI__Mastermind 25800 points

    Hey Satish,

    Based on your requirements, the BQ25895 is a better candidate because of the following:

    You can program the fast charge current up to 5A, which more than enough for your 1.75A total peak load (1.5A charge + 250mA system).

    The D+/D- detection automatically detects the input current limit based on both BC1.2 specified USB ports and non-standard adapters.

    While it cannot directly read the battery temperature, the integrated ADC can monitor the battery temperature sensing pin % (TS pin). This, in conjunction with a lookup table for your specific battery thermistor, can be used to monitor the battery temperature. 

    And with I2C configurability, all charging and input related parameters can be modified.

    The charge status register and fault register can provide information on the charging state and fault state of the charger.

    Regards,

    Joel H