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BQ25505: The selection issue of chips

Tonyx.wu
Genius 4215 points
Part Number: BQ25505
Other Parts Discussed in Thread: BQ25638, BQ25185, BQ24650, BQ25504

Please help with the selection,
Requirement:
1. Solar panel input voltage: 4.5V or above (standard 5V)
2. Single section lithium battery charging, with a standard lithium voltage of 3.6V and a maximum of 4.2V, and a charging current of 500mA or more.
3. With MPPT function
4. Equipped with protection functions such as input low-voltage shutdown protection, recharging, overcurrent protection, etc.

There is a demand of 4KK per year

Special requirements:
The charging IC for solar charging MPPT. The battery is mounted on the charging IC
Is the POWer pass function available? If my charging chip is not working, can the battery supply power to the module? The average power consumption of the module is 100-200mA, and when the power consumption is high, it can reach 2-3A,
Is it possible to supply 2-3 A of power to the system, regardless of whether it is in a charging state?

BQ25570RGRT、BQ25505RGRT、BQ24650RVAR、TI-BQ25504、TI-BQ25505  According to my request, which chip would be the most suitable and cost-effective option to choose?

  • 0
    TI__Mastermind 18510 points

    Hi,

    Tonyx.wu said:
    1. Solar panel input voltage: 4.5V or above (standard 5V)

    Due to the high input voltage of the input panel, the energy harvesting portfolio may not be the best as they require that the input voltage be lower than the battery regulation voltage. Additionally, they are designed for lower power applications so a 500 mA charge current is outside of the capabilities of the portfolio.

    I recommend the BQ25185, it is a linear charger capable of 1A charging with BATTRACK VINDPM feature which works well with solar input applications. Additionally, the BQ25638 may be helpful for this application as it also provides VINDPM features for solar applications and retains a switching topology, if the customer prefers it.

    Best Regards.

  • 0 in reply to Juan Ospina
    Genius 4215 points

    Not considering this condition 1. Solar panel input voltage: 4.5V or above (standard 5V)
    BQ25570RGRT, BQ25505RGRT, BQ24650RVAR, TI-BQ25504, TI-BQ25505 According to my request, which chip would be the most suitable and cost effective option to choose?I need to choose 1-2 part numbers from these

  • 0 in reply to Tonyx.wu
    TI__Mastermind 18510 points

    Hi,

    Without the BQ25185 and considering only the provided part numbers:

    The BQ24650 may be more flexible and since FETs can be externally selected for a higher charge and discharge current, though it does not offer the power path feature to separate the battery pack from the system load.

    The BQ25504 presents an effective energy harvesting solution. One limitation for this charger is that the peak input current is about 200 mA so it is not likely to hit a 500 mA charge current. Aside from that it should be easier to configure.

    Best Regards,

    Juan Ospina