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BQ24075: Review of the Schematic

zunuran nasrullah
Prodigy 220 points
Part Number: BQ24075
Other Parts Discussed in Thread: TPS63061

Tool/software:

Kindly review the schematic of Single cell Battery charger. You can ignore IP5306 circuit as it is not included in design. Basically We want to charge battery from USB-C and by using power path management of BQ24075 we will supply output to TPS63061. Which will regulate the output so that we will get fix 5V on output of TPS63061. And this 5V will be given to another USB-C for external power. 

In previous design we directly used IP5306 and whenever we remove USB and system load shifts on battery, Power was getting disconnected for few seconds and our PCB was keep on resetting whenever USB and battery were switched. So that's why we removed IP5306 and added BQ24075 and TPS63061 combination. 

You can also give recommendation of input and output USB-C connections. Thanks2112.Schematic1.pdf

  • 0
    TI__Mastermind 31090 points

    Hello, 

    Thank you for reaching out via E2E. 

    I have reviewed the BQ24075 portion of the schematic and have the following comments. 

    -Resistor connected at TMR pin is outside of acceptable range. Please refer to pin description for TMR on page 9 for allowable range for TMR resistor. 

    -Output path node of BQ24075 does not appear to match input path node for TPS63061 (VCC_OUT verse VSYS). Based on your description I believe OUT pin node on BQ24075 should be connected to input of TPS63061.

    Beyond the resistor at TMR pin the rest of the BQ24075 schematic looks okay. All required components are connected. 

    Regarding USB-C connections having two 5.1kohm resistors from CC1/CC2 is correct to have USB-C port detected as a sink.  I do not believe output USB-C connector should have same 5.1kohm resistors to ground if it is to act as a current source. I recommend you go back and review that portion of your schematic. 

    Best Regards,

    Garrett 

  • 0 in reply to Garrett Kreger
    Prodigy 220 points

    Thanks for your response. I corrected TMR issue and left it unconnected to select default timer. Also i updated Input /output tags for TPS63061. Can you tell me more or share some documentation of USB-Sink/ Source correct wiring? I did not find any usefull documentation yet.  Both USB-Cs are not connected together as you can see in schematic. So does these two usb-cs qualify for Sink/source combination?

  • 0 in reply to zunuran nasrullah
    TI__Mastermind 31090 points

    Hello, 

    Unfortunately I am not a USB type C expert as BQ24075 IC does not directly interface with USB C connector and I would hate to give you incorrect information. 

    From what I could gather from the internet the 5.1kohm resistors to ground at CC1 and CC2 will cause the USB connector to be considered a sink. For a USB connector to be considered a Source CC lines will need to be pulled up to a logic rail. 

    Best Regards,

    Garrett