BQ25713: ILIM_HIZ & EN_OTG

Hi There,

1- is there any problem with design ?

    It is ok, but we recommend to use charger LDO REGN for this application instead of external 3.3V LDO to achieve this function. Because 3.3V pull up highest level is reflected to 5.75A IDPM which doesn't cover the whole input current range 6.35A.

2- what is difference if i leave ILIM_HIZ float ?

    Can't float ILIM_HIZ, because by default IDPM limit is set by the lower value of ILIM_HIZ pin and REG0x0F/0E, floating ILIM_HIZ pin may result in weird IDPM setting.

3- what is difference if i pull up with VDDA instead of V+3.3 ?

     We recommend to use charger LDO REGN for this application instead of external 3.3V LDO to achieve this function. Because 3.3V pull up highest level is reflected to 5.75A IDPM which doesn't cover the whole input current range 6.35A.

4- is there any contentious current to the pin (system is battery base and CT current is not good) ? is it too much?

    ILIM_HIZ is signal input pin, holds high input impedence, in datasheet the maximum and minimum leakage current can be controlled within +-1uA shown below.

5- how can i disable ILIM_HIZ pin ?

    For input current limit set function you can disable it through configuring REG32H[7]=0. For HIZ mode enable function it can't be disabled.

6- can i control VAP mode using this method?

    It is recommended to pull up EN_VAP pin to 3.3V  instead of pulling down GND, I assume the output signal type of host is open drain. 

    By the way, for your information, VAP mode is defined for Intel CPU based application to help pass CPU fast transient system demand shown below. I believe motor application should hold much longer load transient profile comparing to CPU application. Therefore VAP mode may show limit benefit for motor application.

Regards