Hi Padmanabhan,
Attached is the schematic for your application. (Please visit the site to view this file) We haven't built a board to test whether the ripple is 5mV. But this should provide a very good starting point and we can help make improvement along the way. We've designed this using 12Vin and 24Vout @2A which is the most difficult test for this schematic.
Hope this helps! If you have any further questions don't hesitate to ask.
Thanks,
Anston