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TPS7B81-Q1: body diode

Jon Bilbao
Intellectual 1425 points
Part Number: TPS7B81-Q1

Hi, 

1- What happens with TPS7B81-Q1 if Vout>Vin? 

I guess the body diode of the pass element will conduct. Will this damage the device? Or is there an internal extra diode that conducts during reverse polarity avoiding damaging the internal circuit? 

Is it recommended to use this device for this case? or it is not recommended from TI? 

Regards,

Jon

  • 0
    TI__Genius 14245 points

    Hi Jon,

    You are correct if Vout is greater than Vin +0.3V the pass device's body diode will start to conduct current. This current is not limited so if the Vout to Vin differential is too high the LDO can be damaged. 

    If your application may encounter the situation where Vout>Vin we recommend placing a reverse current blocking diode in series with the LDO to protect it from being damaged. Below are the two most common ways of protecting a device from reverse current.