Hi.
I would make my own driver with TPS63020 too. Now i have problem with PCB, but on the net I found this: http://focus.ti.com/lit/ug/slva268/slva268.pdf
and this http://e2e.ti.com/support/power_management/non-isolated_dcdc/f/196/p/85948/296761.aspx
Maybe it will be useful for you :)
I would...