BQ76200: BQ76200

Hello Star,

I do not believe this was characterized. As long as the voltage on the pin does not exceed the ABS max of 15-V, it should be okay.

Why would the customer want to know this?

Best Regards,

Luis Hernandez Salomon

Hi Luis

Thanks for your reply.

The customer wants to add a small switch to drive a large current switch. The small switch part uses resistor voltage divider to do it. They need to know the current of the DSG_EN pin.

Thanks

Star

Hello Star,

I do not understand what the customer wants to do. Can you clarify? A diagram showing it would be helpful.

If the voltage on the voltage divider is below the spec, then this would be okay. As I said, the max current on the DSG_EN pin was not characterized. I do not understand why they would need to know the current. 

Best Regards,

Luis Hernandez Salomon

Hi Luis 

Thanks for your reply.

They want to design the schematic as below.

Does it feasible?

Waiting for your reply.

Thanks

Star

Hello Star,

What is the function of this circuit? Particularly C1. What is at CN1? 

With this, I still would not expect much current to flow into the DSG_EN pin. If PACK is 60-V, there would be a ~50.9-V drop across R2 due to the D1 9.1-V Zener, which would correspond to about ~509-uA of current through this resistor. Approximately ~303-uA of this amount would be flowing through R5, which means there would be ~206-uA of current flowing through either D1 or R4. 

There is a 1-MOhm pull-down (typical) on the enable pins (Mentioned in Section 6.5 Electrical Characteristics - INPUT ENABLE CONTROL SIGNALS of the datasheet). So I would expect that the DSG_EN would be sinking ~9.1-uA of current with this circuit. Which sounds okay to me. This would mean there would be ~197-uA of current through D1.

Best Regards,

Luis Hernandez Salomon