TPS7A39: TPS7A3901: How to deal with INN & OUTN & FBN when they don't use the negative output.

Noriyuki Takahashi

Genius 11030 points

Part Number: TPS7A39

Hi team,

Could you tell how to deal with INN & OUTN & FBN when they don't use the negative output?

They just want to use the positive and want to understand how to deal with pins that are related to the negative.

Regards,

Noriyuki Takahashi

over 4 years ago

0 Srikanth Lolla Venkata over 4 years ago

TI__Genius 12960 points

Hello,

I am looking into this, I will get back to you by the end the day on Monday of next week.

Regards,

Srikanth

+1 Srikanth Lolla Venkata over 4 years ago in reply to Srikanth Lolla Venkata

TI__Genius 12960 points

Hello,

If the negative LDO is not going to be utilized, I would recommend using a discrete positive LDO instead of TPS7A39. If this part has to be used, it would need to be connected as shown in Figure 65 in Section 8.1.1 of the datasheet and I would recommend - 3.3V voltage source connected to INN. Grounding INN or leaving it floating would either turn off the entire LDO (including the positive side) or leave it in an uncertain state. Thanks!

Regards,

Srikanth

Power management

Power management forum

TPS7A39: TPS7A3901: How to deal with INN & OUTN & FBN when they don't use the negative output.