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Quick Charge 2.0 Buck Reference?

_Lina
Expert 3305 points

Team,

Do we have an applicable reference design similar to this: 

But for a buck application? 

Specifically looking for a buck that can change the output based on feedback from a complementary IC (CHY1000), similar to the tps61008 in the reference design above.

Best,

  • 0
    TI__Guru**** 191445 points
    There are several buck converters that can change output via PMbus or I2C interface. There are other techniques as well such as controlled switching of FB resistors, PWM modulation etc. Can you tell us more about your application requirements?
  • 0 in reply to JohnTucker
    TI__Expert 3305 points
    Hi John,

    Thanks for the quick response!
    What I'm looking for is how to narrow down the portfolio to find a device that implements this feedback topology...is there a keyword or product family you can recommend?

    Also, let me know what other information you're looking for as far as application requirements and I'll be happy to provide:
    Vin: 10-18V, Vout: 5V, 9V, 12V based on output of CHY1000. 3A current max

    Best,
  • 0 in reply to _Lina
    TI__Guru**** 191445 points

    I don't see any reference to CHY1000.   Can you provide more info?  Also do you need all those output voltages over the entire range of input ( 10V in, 5V out and 10V in, 12V out )?  If so you will need a buck boost converter

  • 0 in reply to JohnTucker
    TI__Expert 3305 points

    Hi John,

    I should have mentioned that it is part of the reference design in my first post. See excerpt from the user guide about the CHY1000 IC:

    The Charger interface IC communicates with the portable device being charged to identify if the portable device
    supports QC2.0. If yes, it changes the boost converter’s output voltage by changing the feedback resistor
    according to the requirement of the portable device. If not, the boost converter keeps the default output voltage of
    5 V.

    Also, buck/boost would be ideal but if too expensive, we could source 12V from elsewhere, and only 5V and 9V would be required. Can you provide recommendations for both options?

  • 0 in reply to _Lina
    TI__Expert 3305 points
    FYI - Post above edited
  • 0 in reply to _Lina
    TI__Mastermind 46905 points
    the part number of the charger interface IC is CHY100.
  • 0 in reply to Jasper Li
    TI__Guru**** 191445 points

    all that circuit does is switch in different resistors in the lower leg of the FB resistor divider.  It should be compatible with most buck converters, ideally voltage mode control, as with VMC the lower resistor does not affect the loop compensation.  Let me know if you have further questions.