Try to build an accessory power device for my motorcycle

Hi all, newbie here.
I'm trying to build an accessory power device for my motorcycle. At the moment I'm using the board from a ripped apart USB car charger for the 5 V part, but I'm trying to build a complete circuit.

Now I have some problems. I can't work out what values I need to use for each component to get the output I want.

I'll be delivering anything between 11.2 V and 14 V into the circuit. I would like to get 5 V out at up to 1.5 A. Looking at the datasheet of MC33063A it says it will do 1.5 A out. However, when I try and use an online calculator it tells me that the switch peak for the circuit would be 3000 mA and that exceeds the 1500 mA max value. From what I can tell, this is because I'm trying to go from 12 V to 5 V.

Can I do what I'm trying to with the MC33063A or do I need to look at a different component to base the circuit around? If so, which should I be looking at?

For the record, the reason I want 1.5A out of the 5V circuit is that I want to be able to power / charge a GPS (TomTom Rider) and also a bluetooth USB dongle. I would also like the ability to charge a phone when not using the GPS and bluetooth dongle.

As far as I can tell you should be fine. Current can kill a circuit (and lots of other things) but so long as you don't exceed the voltages (which isn't possible) you'll be okay. It can output 1.5A and it won't be able to "force" 3.0. It seems to have a current sensing capability so it may limit the current automatically in an over-current situation.

Here is another option though: it's a switching regulator with a fixed 5V output, goes up to 3A, and is throughhole.
https://www.digikey.ca/product-detail/en/sanken/SI-8050S/SI-8050S-ND/4175641

If surface mount doesn't phase you then you could also try this:
https://www.digikey.ca/product-detail/en/sanken/SI-8050SD-TL/SI-8050SD-TLTR-ND/4175724

And if you think that maybe you might want to get something that is a completed product then this:
https://www.amazon.ca/Webetop-Water...?s=electronics&ie=UTF8&qid=1496632836&sr=1-12

I hope that helps a bit. There's a user called WolfeB who makes power-amps for a living so his feedback would be pretty valuable here!

I'd go with an off-the-shelf solution.
Liam's last suggestion or something simpler:
www.ebay.com/itm/292083773977
or
www.ebay.com/itm/152533631179