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BQ25601D: Charging solution with TPS2121

d_zero
Genius 4660 points
Part Number: BQ25601D
Other Parts Discussed in Thread: TUSB321, TPS2121,

Dear Jeff,

Design:

AUX DC 5V 3A

VBUS 5V depends on DFP, the TUSB321 has this info ( 0.5A USB2, 0.9A USB3, 1.5A, 3A)

TPS2121 ILIM -> 3A

as suggested to use BQ25601D and TPS2121 for our application, we looked into the two IC and have some questions:

1) If we have only AUX DC 5V connected to BQ25601D trough TPS2121 and the USB VBUS is not connected.

The charger BQ25601D can't detect what kind of source is connected because there is no D+, D- connection.

What charging current for the battery will the charger set?  

2) Have you a suggestion how the charger can detect that Vin is the AUX DC?

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Second topic is we want to realize this states below: ( we think this is typical usage in mobile phone or laptop)

We want to have only one PUSH BUTTON , do we need some button controller to realize this or how is this down with BQ25601D?

Best Regards,

David.

  • 0
    TI__Genius 11850 points

    Hi David,

    1) If the BQ25601D can't recognize what kind of source is connected because there is no D+/D- connection, then it will be treated as an unknown adapter, and the input current limit will be set to 500 mA. However, this has no bearing on the battery charge current, which is set by register REG02 bits[5:0].

    2) I'm not sure I understand your question. The TPS2121 mux should be able to automatically give priority to AUX if AUX is connected, but VBUS is not. The table below provides an overview of the different modes:

    3) Please see Section 9.4.4 in the datasheet for information about the QON pin, which could be helpful to you in implementing a push button.

    Best regards,

    Angelo