Priority power mux for two 12V/6A inputs

Hi Abin,

We do not have an integrated PMUX solution that can handle 12V at 6A.

I believe you will have to use a dual IC solution with eFuses as shown in this document here:  https://www.ti.com/lit/an/slva811a/slva811a.pdf 

Please find the eFuse portfolio here: https://www.ti.com/power-management/power-switches/efuse-hotswap-controllers/products.html 

To get the fastest support on eFuses if needed, please ask a new question and tag the eFuse part. 

Thank you for choosing TI Power Switches in your designs.

Thanks for your kind reply.

Unfortunately, all the efuses in that app note are rated below 6A.
Interestingly, I just came across @LM74800. I think two such ICs can be used as a solution to power mux two supplies- meeting two basic requirements of PMUX:
1) Reverse current blocking
2) Blocking forward current through MOSFET body diode while MOSFET turned OFF. 

This is a snippet from an app note: SLVAES2

Why do we need the Mosfet driver (Q5) at Aux LM74800 side only? 
Moreover, although the datasheet has listed multiple applications but hasn't shed much light on PMuxing. 
Do you have more design information on PMUXing using LM74800 like detailed design procedure for this application too?

Karikalan Selvaraj I had been noticing your comments in similar contexts. Would you be kind enough to have a look at my query too? 

Thanks & regards,

Abin

Hi Abin,

I have passed this thread to Praveen so that he can provide better support of these devices.

Hi Abin,

Are you okay with a current limit of 6A which will allow a Max Load current of 5.5 A.  If yes, 2x TPS25947 would be a perfect fit for your application.

Please refer to section '9.4 Priority Power MUXing' of TPS25947 datasheet.

TPS25947 also has a ITIMER function which allows you to pass transient load currents > 5.5A for a certain duration set by the ITIMER  capacitor.

 TPS25947 provides more compact and  feature rich solution compared to LM74800-Q1. 

Hi Praveen,

Thanks for getting involved. I very much liked TPS25947- it is cheaper and small only downside being not meeting my current requirements.  Mine is a 71W (at PD side) PoE application with optional 12VDC adapter in. A 12V Adapter input joins the 57V to 12V DC-DC converter o/p and this is where I am looking for a solution.

About the amperage, yes, I prefer a part  with 6A load current support which is close to my power requirements. 

For time being I would like to keep TPS25947 on the back burner if it can't work with 6A load. It is also a product decision, you know. 

Thanks & regards

Abin