TPS7A16: Reverse currents from Out to In

Örs

Part Number: TPS7A16

Hi TI,

I have seen in the datasheet of the TPS7A16 at the absolute maximum ratings, that the "OUT pin to IN pin" voltage should not exceed MIN: –62V and MAX: 0.3V.

Based on my measurements (see Oscilloscope screenshot below), as the input voltage drops under ~900mV, the output voltage stays on a ~300mV higher potential parallel with the dropping input voltage.

Is this phenomenon dangerous for the MOS "Pass Device"?

Thank you in advance.

Örs

over 5 years ago

0 Jason Song over 5 years ago

TI__Mastermind 23361 points

Hi Örs,

At the condition you specified, the Vout - Vin = 600mV which violates the absolute maximum allowable voltage difference between Vout and Vin. During this process, the ESD could see the potential risk of being damaged. You could consider speed up the output voltage discharge, or consider adding a diode between output and input to clamp the difference less than 0.3V.

Regards,
Jason

0 Örs over 5 years ago in reply to Jason Song

Prodigy 130 points

Hi Jason,

Based on the Oscilloscope measurement, the Vout - Vin is 300mV, but that is also hard on the limit so I will consider your tips.

Thank you for your quick response,

Örs

0 Jason Song over 5 years ago in reply to Örs

TI__Mastermind 23361 points

Hi Örs,

Thanks for your feedback, and if you need additional help, feel free to post back here.

Regards,
Jason

Power management

Power management forum

TPS7A16: Reverse currents from Out to In