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BQ24074: USB-C 5V 1A DCP schematics

giorgio casti
Prodigy 40 points
Part Number: BQ24074
Other Parts Discussed in Thread: TPS25810, BQ25630

Tool/software:

hello guys, 

I'm working on a board and I need to provide a USB-C charging port, limited to 5V 1.5A max. 

I'm using a BQ24074 as main source of power and to manage the battery. this give me a DC power source of 4.4V 

As per my understanding ( correct me if wrong) I would need : 

-  A PD controller 

- A buck boost converter ( 1.5A 5V ) to pass from 4.4 to 5V 

Does a reference design exist for and application like this or can you move me on the right IC to be used? 

Best Regards

  • 0
    TI__Expert 8315 points

    Hi Giorgio,

    Thanks for reaching out.

    If I understand correctly, you're looking to provide a USB-C port on the OUT pin of the charger. Since the OUT pin of the BQ24074 is regulated to 4.4V when VIN is present, you're correct that you'll need to boost from 4.4V to 5V using either a boost or buck-boost converter. The input current limit (ILIM) of the BQ24074 can be set to 1.5A by connecting a resistor from ILIM to VSS.

    If you want to provide 5V at 1.5A from the output of the BQ24074, then you don't need a PD controller. However, you will need to advertise the capabilities of this port. This can be done by either:

    • Using 22kohm resistors from each CC pin pulled up to 5V (advertises a 1.5A DFP at 5V)
    • Using a downstream-facing port (DFP) controller, such as the TPS25810

    I recommend opening a new thread with the DPF controller part number for specific recommendations.

    Alternatively, I'd highly recommend using the BQ25630. While this charger is not yet in full production, parts are available for prototyping.

    Please let me know more about your requirements, and I'd be happy to help further.

    Best regards,

    Alec