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Can bq24773 Input monitoring and control components be removed?

Stuart Borden
Prodigy 180 points
Other Parts Discussed in Thread: BQ24773, BQ25700, BQ25703, BQ25700A, BQ25703A

Hello,

I am implementing a USB power bank with the BQ24773 as the charger/battery path controller. The device will adapt from any USB charger up to the 60W USB-C for both pass-through and charging. To do this, a special front end IC is being used and it has its own integrated VBUS current monitoring, back-to-back VBUS NFETS, reverse polarity protection.

As the setup is less cumbersome for the reverse polarity protection and pre-qualification of the charger input from the USB protocols, I want to use them instead of the respective components on the BQ24773. SInce the BQ24773 advertises input current sharing (i.e., battery-boost and charger current limiting), does this mean the BQ24773 input FETS are used also for throttling the input power?

Overall, the 24773 is a great IC.

But, come on, guys.

You monitor all these values for input/output/battery voltages, currents, etc.

Why do you not make these values available over the I2C/SMBus link?

Buffered analog power output and current signals, really?

Stuart Borden.

  • 0
    TI__Guru 56650 points

    According to your request, the latest buck boost charge bq2570x is more suitable for your application.

    1. It has multi-channel ADC to monitor all these values for input/output/battery voltages, currents.. and can make these values available over the I2C/SMBus.

    2. The input current optimizer function allow bq2570x to optimize the adapter current limit. It is good for any USB charger up to the 60W USB-C.

    3. It can do buck and boost. So, it is good for USB-C.

    It also has a lot of other powerful features. The bq25700 (SMBus version) was released couple month ago.The bq25703 (I2C version) and bq25700A will be released in first quarter of 2017.

    Please find a local FAE to get more detail info or apply/order bq25700 EVM to test. 

  • 0 in reply to Wang5577
    Prodigy 180 points

    When we contacted them (about 1 month ago, figures), the 24773 was recommended because of the power (60W) and voltage levels (20V) required.

    On the outputs, we have individual boost regulators for each port to reduce the system losses and provide flexibility for each port and to make the system expandable/design re-useable in the future.

    The current design is a 1S design with high-discharge cell, 5000mAh.

    As we are going to be in pre-production by the scheduled release of the 25703, I don't consider it an option. I have already made allowances for the monitoring shortcomings of the '773 and just want to avoid an entire second set of FETs and the roundabout method of reverse protection required by the '773.

  • 0 in reply to Stuart Borden
    Prodigy 220 points
    Hello ,

    If we are using BQ25703A as charger , no need to use Type-C PD controller (for negotitation) .

    Thanks
    Srinivas
  • 0 in reply to Srinivas Beera
    TI__Guru 56650 points
    bq25703A is a slave device. Any EC and host controller can send commands to control it. If the input port is not a Type-C PD port, bq25703A doesn't require any command from Type-C controller.