Power management IC for larger battery and higher current

[Scigrapher]

I'm putting together a project that requires a "large" (1500mAh+) rechargable battery, both because of the desire for long times between charges and to enable powering a peripheral that has a significant current draw (PPK2 measurement linked).  The vast majority of the time the display is unpowered, but a few times a day it will do as in the measurement - ~230mA average, 1.32A max, ignoring a 1.5A spike when it first is enabled).  I'm looking for a solution with LiPo battery charging, USB power input (no PD needed), fuel gauging, support for the display's current draw (plus safety buffer), and a low power usage.  I happen to have an nPM1304EK that I've been using for a smaller version that works great, but I don't think it's going to scale up to the full size because of the increased current requirements.  

If I used the nPM1304, I have to figure out a couple of problems:

1. Powering the display - Have a separate buck off the unregulated rail (which I THINK can handle this load?  I can't find whre I saw the max current) for powering the display. I have some components that should work, but if you have recommendations on something with a low IQ and supports ~2A, I'd love to hear it.
2. Battery support - Figure out how to create a battery profile for the large battery.  PowerUp doesn't support anything even remotely close to 1500mAh.  It doesn't really matter to me that it might take a day to charge it.

Alternatively, I can use something else besides the nPM1304.  It seems like my project might be outside the target audience for it.

Any thoughts or recommendations?

  PPK2 recording:  13 Inch display update.ppk2

[mathiaso]

Cool to hear!

I got an answer to the internal ticket I created as well.

1340mA is the limit we can support from VSYS. This is limited by the discharge current limit of the battery. It is possible to use bigger bulk caps at the display for filtering of the short pulses. You can add the capacitor and use the PPK2 to characterise the current profile to make sure the current stays below the current limit.

Regarding your request for a recommendation of a discrete buck, I'm afraid it's difficult for us to recommend parts we haven't designed ourselves.

[Scigrapher]

If 1340mA is limited by the discharge current of the battery, does that mean a battery with a higher discharge current will result in a higher supported VSYS current?  The discharge current of the battery I'll be using will be 1500mA+.

My nPM1300EK should be arriving today, so hopefully I can start trying things out soon.  I'll need to do some calculations for the capacitors.  

I understand about the recommendation.  I have a buck EK from TI I'm going to give a go.

[mathiaso]

Scigrapher said:

If 1340mA is limited by the discharge current of the battery, does that mean a battery with a higher discharge current will result in a higher supported VSYS current?  The discharge current of the battery I'll be using will be 1500mA+.

No, might not have been the best formulation there. I'm sorry. By the discharge current limit, we're talking about the current limiter of the nPM1300 itself. The battery current limit has two settings, 280mA and 1460mA (typical). And when adding some margin, we get a maximum current of 1340mA.