LED Drivers and step-up converters

Using Arduino Project Guidance
#1

Hey everyone.

I am working on a project that I plan on running off a 3.7v li-po battery.

I will be running 4 high powered leds in parallel and an Adafruit Pro Trinket (5v version) so obviously I need to step-up the voltage. But for the Pro Trinket, I'm assuming it needs around 7 volts like the arduino for the power regulator to work properly. However, the LED drivers I wanted to use here:

can take a max of 5.5v. I'm also worried about supplying to much voltage to my LEDs.

So, here are my questions:

Do the led drivers protect against over voltage?

Where can I find different LED driers that can be controlled via pwm that can take higher voltage? I tried to find them but these supply websites are impossible for a newbie like me to navigate.

Should I use the 3v pro trinket? Would it power my sensors, N-channel mosfets, etc okay?

How can I power the Pro Trinket?

Would a 7.4v battery be better?

Thanks in advance.

#2

You can power the Arduino from 5V regulated.

(Your Digikey link doesn't work.) If the LED drivers are rated for 5.5V maximum, that's the maximum.

#3

Boost regulators are available. Examples:

#4

I know 5.5 is the max, as I stated that in my post. I'm looking for something that might e higher though.

This is the part number of the drivers. You can google it and it will come up:

CAT4101TV-T75

#5