It sounds like you might be stuck in softstart. Reading the softstart section in the D/S and looking at figure 12 would confirm this.
These design notes also have information about this:
http://e2e.ti.com/support/power_management/non-isolated_dcdc/w/design_notes/tps61030-soft-start-switch-current-limit.aspx
http://e2e.ti.com/support/power_management/non-isolated_dcdc/w/design_notes/tps61026-boot-up-problem.aspx