TPS3825-Q1: Hiccup mode power saving with power on reset

Hi Alberto,

See my response below in green.

1) Do you think the system could work? it would be a similar function of using the TPL5110, which I can not use because it's not P2P compatible.

Yes, I believe your idea will work.  The only concern I have is the FET drive capability.  The TPS3825-Q1 has a push-pull output for both reset pins.  You may need to buffer the reset signal if you are wanting to have fast response time.

2) The time-out period after MR goes high is actually the t-delay time ? if this is true, could you suggest a similar alternative component (sot-23) with a t-delay of around 1.2-1.6 seconds? 

The t-delay time is listed below:

3) Other/different components suggestion for this function ? they shall have a P2P alternative (as a back-up solution in case of purchasing problem)

I don't believe there is p2p alternative.

Ben

Hi Ben,

Thank you for your response and suggestions.

With a longer reset t-delay (around 1 second) are there other similar Part Number I could evaluate?

If using one with programmable t-delay via capacitor, do you think my idea still make sense? my concern would be if relying on a capacitor value over time and temperature would be so reliable, but maybe I'm wrong.

Thank you for what you can answer.

Alberto  

Hi Alberto,

If you want to keep p2p capability, then there is no device.  If you have flexibility of pinout, you can try the TLV840M, where you can program the delay time via capacitor.  See below:

Yes,  your idea still makes sense.  Most ceramic caps have a +/-10% tolerance and will be reliable over temp if you choose a X5R or X7R.

Ben

Hi Alberto, 

Glad to be of help!  Good luck to you!

Ben