BQ24074: BQ24074RGTR current flowing to the VIN

Hello Nasib,

The BQ24074 blocks reverse current from flowing from OUT to IN, so I wouldn't expect to see voltage on IN without USB power connected. Could you share your schematic so we can better understand what might be happening in your system? Also, how much current are you measuring flowing into IN?

Best regards,

Alec

Hi Alec, here you have the schematic. 

Hello Nasib,

Thanks for sharing your schematic — I don't see any obvious issues.

Could you clarify how many of your boards have this issue? Is the 2.5V on VIN stable? Do you still see this behavior if you remove the battery and reconnect it?

Best regards,

Alec

All of the boards has the same issue. And not just this board but other similar designs as well. 

Here you have the signals: 

Stable Vin when just Vbat is present: 

I allways see it even if i unplug and plug the battery again 

Hello Nasib,

Thanks for sharing the additional details. Just to clarify, are you seeing this behavior across multiple boards with different designs, even those that don't use the BQ24074? If so, it might be helpful to double-check the measurement setup.

Could you confirm this 2.5V reading on VIN with a multimeter? Also, are you seeing any current actually flowing into VIN, or is it just the voltage measurement?

Let me know what you find, and we can go from there.

Best regards,

Alec

All my designs use the BQ24074. 

I also see it with the multimeter. 

Before the diode I have a resistor divider and I can see current flowing from the Vin to GND through the resistor divider due to the leakage current of the diode. 

So yes there are 2.5v and current flowing from the vin pin 

Hello Nasib,

Thanks for the clarification. If VIN remains stable without an input source, something must be actively biasing it.

Could you share the part of the schematic showing the resistor divider and anything else connected to VIN? Also, how are you measuring current flow through the resistor divider? If possible, could you measure how much current is actually flowing?

VIN is not expected to remain at a stable voltage without an input source, so I'd like to understand if there's something in your design that's unintentionally biasing it.

Best regards,

Alec

Hello Nasib,

I wanted to check if you still need help with this issue. Let me know if you have any updates or further questions.

Best regards,

Alec