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BQ24192: USB - PD Power delivery with battery charging functionality

BINYAMIN A
Prodigy 110 points
Part Number: BQ24192

Tool/software:

Hello,

I'm planning to design a USB - PD power delivery system for the below requirements.



Sl No Requirements
1 Input power
2 Power Adapter 5V/3A , 9V/3A, 12V/3A, 15V/3A
3 Power Bank 5V/3A , 5V/2A
Battery charger requirements
4 Battery charge current 2A
5 Max charge Voltage 4.2V or 4.1V
6 Battery Type LiIon Battery 3.6 Nom Voltage
7 Battery Min Operating Voltage 2.8 or 2.85V
Output power requirement
8 Output SYS voltage 4.1V or 4.2V
9 Output SYS Current (Continuous) 4.5A ( If battery can provide power in case of peak demand)
10 Battery Discharge Current 6A (Continuous) , 9A (Peak)


Please suggest if BQ24192 will be suitable for the above requirements. The average load requirement will be around 8W, with a peak power requirement of about 25W

  • 0
    TI__Genius 14075 points

    Hi,

    The input support for this device is 3.9V to 17V and 100mA up to 3A of input current so I believe that should suffice.

    In terms of charge current it can support 500mA to 4.5A at 3.5 to 4.4V and a BATLOWV of 2.8V or 3.0V. so in this case it should also be sufficient.

    The device has a max recommended operating SYS current of 4.5A. For IBAT discharging it can handle 6A continuous and 9A peak (up to 1 sec) current.

    Based on all your requirements this charger should be able to support your application.

    Best Regards,

    Juan Ospina

  • 0 in reply to Juan Ospina
    Prodigy 110 points

    Hello Juan,

    Thank you for your previous response.

    I have some additional questions regarding the BQ24192, specifically concerning its Dynamic Power Management (DPM):

    1. How crucial is the INPUT CURRENT LIMIT setting for triggering Supplement mode in the device (i.e., where the battery starts discharging to support the load demand)?

    2. In our application, achieving the peak load demand of 25W with the BQ24192 requires the battery to supplement the load (since ISYS is limited to 4.5A, while the battery discharge current ranges from 6A continuous to 9A peak).

    3. For instance, if I connect a 15V/3A (45W) adapter and set the input current limit to 3A, the adapter won't exceed this limit even under peak load (25W). However, would the device draw more than 4.5A from SYS (possibly 5,6 or 7A depending on Vsys ) since the ILIM isn't exceeded yet, and Supplement mode hasn't been activated (meaning the battery discharge isn't occurring)?




  • 0 in reply to BINYAMIN A
    TI__Guru** 104825 points

    Hello Binyamin,

    Due to the U.S. holiday our responses may be delayed. We will respond by the end of the work week.

    Sincerely,

    Wyatt Keller

  • 0 in reply to BINYAMIN A
    TI__Genius 14075 points

    Hi Binyamin,

    BINYAMIN A said:
    How crucial is the INPUT CURRENT LIMIT setting for triggering Supplement mode in the device (i.e., where the battery starts discharging to support the load demand)?

    Input Current Limit (along with VINDPM) will determine the max amount of current that can be pulled from the input. If the System load exceeds this limit significantly (by more than the programmed charge current) the battery will start supplementing. This is very application specific, in some scenarios the load has peaks that are much greater than the input current limit and in other scenarios sys load is always far below the input current limit.

    BINYAMIN A said:
    For instance, if I connect a 15V/3A (45W) adapter and set the input current limit to 3A, the adapter won't exceed this limit even under peak load (25W). However, would the device draw more than 4.5A from SYS (possibly 5,6 or 7A depending on Vsys ) since the ILIM isn't exceeded yet, and Supplement mode hasn't been activated (meaning the battery discharge isn't occurring)?

    If a large load is present on SYS then the device would draw more than 4.5A on SYS. This is above the recommended operating conditions so it isn't recommended that this occur during a large percentage of the device operation, but the device should be able to provide that current. So this should be fine. Even is ILIM is exceeded the SYS load can be supplemented from battery for higher current draws.

    Best Regards,

    Juan Ospina