LM25576: EPAD Connection

Chandra Prakash

Part Number: LM25576

Hello Team,

Where should I connect the EPAD in this IC while using it in Inverted Buck-Boost Configuration ? Should I connect it to GND or to the PGND/AGND Pins ?

Thanks in advance

Regards

over 3 years ago

0 Daniel Li14 over 3 years ago

TI__Mastermind 27470 points

EPAD should connect to PGND/AGND pins

0 Chandra Prakash over 3 years ago in reply to Daniel Li14

Prodigy 70 points

Hi Daniel,

I have made my design in Webench where I am using LM25576 in inverting Buck-Boost configuration

The input in this case in 12V and the output is -12.4V. Unlike in normal configuration, the PGND and AGND are connected to -12.4V(not to GND!). But the LM25576 mentions that the EPAD should be connected to the PCB GND. This is confusing me. Should I connect it to PCB GND or to the AGND and PGND Pins of the IC?

Regards

0 Daniel Li14 over 3 years ago in reply to Chandra Prakash

TI__Mastermind 27470 points

As EPAD is a floating net, major used for thermal dissipation, so connect PCB GND(input-) or PGND and ANGD pin both are OK. Connecting PGND/AGND PIN will be more easier for layout. and as it is -Vo, it also have enough copper for thermal dissipation.

Power management

Power management forum

LM25576: EPAD Connection