• Resolved

TUSB320: how much is the charge current

Part Number: TUSB320

Q1    I have a new  dongle product  which has one DC  power source connector  and a type-c connector . When there is no DC power source ,the the type-c  of the product is in UFP mode   and it can be charged by the  type-C , 5V/1.5A is enough.    When there is a DC power source ,the type-c  of the produce is in DFP mode,   the prodocut acts as a  type-c powre charger ,the output is 5v/3a max  .It can charge some mobile devices  such as IPHONE, macbook  .Do you have  a good IC to be adviced.

Q2  I want use   TUSB320LA.But I dont know that when  TUSB320LAI is  in DFP mode  and typc-c  advertise 3 A current and an phone  is connected , how much is the charge current . Is it 500mA?Is it necessary that we add an another chip  such as  TPS2514  if f i need  a higher current such 2.4A     
Q3  if  we use  tusb422 and it is connected with a phone that don't support usb-pd but  support QC2.0 and BC1.2 ,How much is the charge current? Is it just 0.5A? 
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  • Q1 response:  The TUSB320LAI/HAI can be used for this application for Type-C only support.  The TPS65987D is a good part if you require USB PD support.

    Q2 response:  The TUSB Today's iPhone doesn't implement Type-C. iPhone use DP/DM lines in a Apple proprietary manner to negotiation higher than 500mA charge current.  You will need a device like TPS2514 to charge devices which only use the DP/DM lines.  For devices which use Type-C advertised current instead of DP/DM, the TUSB320LAI can be used to indicate the Type-C charging capability of the charger.  

    Q3 response:  The TUSB422 or the TPS65987D both support PD.  The TPS part integrates all the necessary PD logic while the TUSB422 is a PD phy only.  If you use TUSB422 all PD logic such as load switches, MCU, etc.. must be implemented discretely.  If you Plug in a device which doesn't support PD or USB-C, like a iPhone, then charge current will be determined by DP/DM.  The charge current maybe 500mA or it could be higher if your charger supports QC or Apple proprietary method.