MPQ4242 USB Type A Support

DC-DC Power Converters
1

Hello, I have implemented a design using the MPQ4242 for a USB 2.0 Type A port, however it seems that none of the secondary supported charging modes are available from the device in my current configuration. I have a second implementation in the same PCB that is routed to a C-port that works correctly.

The device initializes in the legacy charging mode when the power converter is set to enable VBUS, but BC1.2, QC modes, Apple Charger mode, FPC mode, and Divider Mode don’t appear as available protocols. Testing with the Passmark PM125 PD tester I can get the device to come up in legacy mode at 0.9A or in DCP mode at 1.5A, but per the datasheet in this configuration all of the fast-charge protocols must be disabled. I have tried many device configurations, different cables, etc. I have also tried tying the CC1 pin to VBUS using a 56kOhm resistor to simulate the device being plugged into a USB C to USB A cable assembly, but to no avail.

Is there a way that the CC lines can be tied on this device to put it into an A-port mode? Or is there another MPS device that supports the BC1.2 A-port modes and the other proprietary charger modes?

Please see the attached schematic section of the A-port below:

MPQ4242_Schematic_A_Port_Snippet
MPQ4242_Schematic_A_Port_Snippet2228×1011 277 KB

Thanks for your assistance!

CJRS

2

Hello jsmith,

are you able to test with devices that acutally require these protocols?

The MPQ4242 has a state machine that determines if a device that supports one of the outlined schemes is connected. It seems that your testing device senses what scheme is available?

Thank you

3

For anyone else facing this issue, adding a 5.1kOhm pull-down to CC1 enables VBUS and the state machine and I was able to see all of the protocols that the MPQ4242 is supposed to support.

I must unfortunately say that MPS support has been quite poor. I submitted a support request via the web-form, called the Detroit office and left a message for an FAE, and got no reply from either for 2+ weeks as of this forum post.