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TPS25750: Inquiry about TPS25750

Zeming Kong
Expert 3515 points
Part Number: TPS25750
Other Parts Discussed in Thread: BQ24105

Hi team,

My customer is evaluating TPS25750 to battery charge by USB PD.

Here are some questions, could you help answer?

1. If we use TPS25750S as SINK side, do we need external FET?

2. What do we need to do if we want to power TPS25750 by USB when USB cable inserted and by battery when USB cable unplugged?

3. If a non-PD device is plugged in, will TPS25750 charge the battery or not? If not, how can we charge the battery ignoring CC condition by no-PD device?

4. TPS25750 needs I2C communication, but can we use non-I2C battery charger IC (ex. BQ24105) here? If not, could you suggest a suited charger IC for 1cell Li-ion battery?

5. The GPio pins of TPS25750 are used in which kind of situation?

Best,

Zeming

  • 0
    TI__Mastermind 32891 points

    1. If we use TPS25750S as SINK side, do we need external FET?

    If you use the TPS25750S and wish to use the HV path, then you will require an external FET.  The TPS25750D has an integrated bidirectional powerpath that may be better for this application

    2. What do we need to do if we want to power TPS25750 by USB when USB cable inserted and by battery when USB cable unplugged?

    The EVM user's guide shows this configuration.  When the Type C cable is not connected, PP5V and VIN_3V3 need to be provided for the system to function properly.

    3. If a non-PD device is plugged in, will TPS25750 charge the battery or not? If not, how can we charge the battery ignoring CC condition by no-PD device?

    A non PD device will still produce a known voltage/current of at least 5A/900mA and possibly up to 3A.  This is sufficient to slowly charge most small batteries,

    4. TPS25750 needs I2C communication, but can we use non-I2C battery charger IC (ex. BQ24105) here? If not, could you suggest a suited charger IC for 1cell Li-ion battery?

    If you have an external MCU, then you can manage the charger and TPS25750 yourself to support any charging platform.  I am not sufficiently knowledgeable about the charger product line to suggest an option here.

    5. The GPio pins of TPS25750 are used in which kind of situation?

    There are many events mapped to the GPIO that can be used in different systems.  Please refer to the TRM https://www.ti.com/lit/pdf/slvuc05 for detailed explanations of the various events.