Q: TPS63020 Pgood sink current capability question? by 1023006

Hello,

          Could you let me know Pgood sink current capability of TPS63020? I saw datasheet and switch pro, they use 1M ohm for Pgood pull higih resistor to 3.3V output terminal. Is mean the Pgood sink current capability is very low?

 

 

 

Thank you,

Vincent


A: Re: TPS63020 Pgood sink current capability question? by 244698

Hello Vincent

Could you let me know Pgood sink current capability of TPS63020?

The test condition in the specification section is 10uA.  At that current voltage at the pin will be typically 0.04V and a max of 0.4V over temp.   As current is increased the voltage will increase.   How much current the pin can sink will depend on the circuit using the PG pin and how low a voltage at the PG pin is required for a valid low. 

 Is mean the Pgood sink current capability is very low?

Pgood (PG) pin current sink capability is low.  But this is a signal line only and a large amount of current sink should not be required. 

Bill Johns 

 

 

 


Q: Re: TPS63020 Pgood sink current capability question? by 1023006

Bill, Michael,

               Thanks for your comment, it is very clear. 

Thank you,

Vincent

              

 

The PG signal is an open drain signal and Rdson of the MOSFET will range between 0.04V/10uA=4kohm and 0.4V/10uA=40kohm.  The combination of Rdson and sink current determines the voltage at the pin.  Value of the pull up resistor will determine the sink current.  

The specification for Pgood (PG) pin are located in the Control Stage of page three, PG output low voltage.  Test condition—Vout = 3.3V , Ipgl = 10uA.  Specifications 0.04V typical and 0.4V Max.