DRV8452: some questions

Hey Zeming,

Zeming Kong said:

1. What is the max output current of the internal DVDD LDO?

Let me contact design team for this.  FYI, per 10.2 Power Supplies, The DVDD pin is not recommended to be used as a voltage source for external circuitry.  

Zeming Kong said:

2. What will happen is the logic pin voltage is between the threshold values? eg. 0.8V at EN, will it be H or L or Hi-z?

The behavior will not be deterministic between the threshold values.  For some chips it might be read as Low at 0.8V, but then you might find some quantity of devices that read 0.8V as High.  For example maybe 70 out of 100 samples read low, and 30 out of 100 high.  It also might have different behavior over time or temperature.  Basically we can't guarantee behavior outside of our given ranges. 

Zeming Kong said:

3. What is the max and min values of tOFF?

9us to 35us

Regards,

Jacob

Hi Jacob,

Thank you very much. Please let me know if any update for the LDO output.

And the max and min values of tOFF, I mean for each setting, what is the max and min values?  For example, when TOFF=0, tOFF is typ. 9us, min. 7us, max. 11us. 

Best,
Zeming

Hey Zeming,

Unfortunately I don't have any data on the min/max values for TOFF beyond that given typical number.  

I am still waiting to hear back on LDO info.

Regards,

Jacob

Hi Jacob,

Do you have any design target or simulation data for the tOFF? That information will also help a lot.

Best,
Zeming

Hi Jacob,

Understood, thank you very much!

Hi Jacob,

Sorry to reopen this thread. The customer does not plan to use the LDO for any other load but only the VCC.

He needs TI to add the LDO spec to the datasheet, could you please support this request?

Best,
Zeming

Hey Zeming,

Ahh okay, that is fine.

Zeming Kong said:

He needs TI to add the LDO spec to the datasheet, could you please support this request?

We don't plan on putting the LDO spec into the datasheet as it is not recommended to be used for other external connections.  Will showing the customer the statement above satisfy customer, that typing VCC to DVDD pin is recommended in that table as desired? 

Regards,

Jacob