TPS2378: Difference TPS2378 vs TPS2379

Winnie Puuh

Intellectual 2580 points

Part Number: TPS2378
Other Parts Discussed in Thread: TPS2379,

Team,

my customer would like to replace TPS2378 with TPS2379.

In their application they are using TPS2378 (APD shorted with RTN – not used internal pass MOSFET).

Looking at the difference is that TPS2379 has a gate drive circuit at the same pin as APL on the TPS2378.

Can I keep the short to RTN that is currently in the layout or do I have to modify the layout to start using the TPS2379?

Thanks!

over 2 years ago

0 Michael Pahl over 2 years ago

TI__Mastermind 21320 points

Hello,

We would recommend making the GATE pin on the TPS2379 OPEN / floating instead of connected to RTN. The GATE pin is connected internally to logic, and I think it best to leave it open.

then the TPS2379 could be inserted into TPS2378 applications.

Let me know if you have any further questions!

If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

Regards,

Michael P.

Applications Engineer

Texas Instruments

0 Winnie Puuh over 2 years ago in reply to Michael Pahl

TI__Intellectual 2580 points

Hello Mike,

thanks for the quick response. I understand that this is the best way.

I also read in the electrical specs that the sourcing current of the gate driver is a mere 60uA.

A short to RTN at such low current should not be a problem. Is this correct? Maybe I misunderstand the specifications.

Please explain.

Thanks a lot

Frank

+1 Michael Pahl over 2 years ago in reply to Winnie Puuh

TI__Mastermind 21320 points

Hey Winnie,

When I look at the block diagram, the GATE pin is connected to some logic output and comparator input.

In theory these should have no issue connecting to RTN, but I am not sure how "ideal" that inverter is. So it may be worth some testing, for full load, no load to be sure.