• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 113 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS25831-Q1: 5V/3A charger MFi certification

Roy Chou1
Genius 13445 points
Part Number: TPS25831-Q1

Hi Team,

We want to use TPS25831-Q1 and meet MFi requirement. As app note said, 3A current limit  suggest place 330uF cap on CSP. To my understanding CSP line is like Vbus.

https://www.ti.com/lit/an/slvaeq2/slvaeq2.pdf?ts=1661428831832

But about below document from MFI certification, USB-IF suggest that don't place 10uF on VBUS. It may be a conflict between our APP note. Let me know if I have any misunderstand.

Regards,

Roy

  • 0
    TI__Intellectual 2370 points

    Hi Roy,

    As per USB2.0 Spec,

    1. For the downstream port of a Hub or a Host (i.e., the upstream end of a cable), the capacitance shall be no less than 120uF.

    2. For the upstream port of a Hub or a Device (i.e., the downstream end of a cable), the capacitance shall be no more than 10uF.

    Since TPS25831-Q1 is a downstream port controller that provide power to the far end device, the capacitance should follow the first rule.

    Thanks.

    Bing