Hi Davenir,
TPS40140 can work on a 5Voutput. But you have to seperate Vin of the power stage and VDD of controller. Because VDD of TPS40140 is max 15V. You can use at least 2xTPS40140 for 5V/60A application. Attached is reference design for your reference. You may order an EVM to test the thermal performance per your application. You can contact weidong Zhu (weidong_zhu@ti.com) for your further questions.
(Please visit the site to view this file)
Thanks,
Nancy