There is no need to have both a sponsor and a champion for a successful lean six sigma program. Project champion can be a project sponsor.
Champion / Sponsor set the direction of process improvement in the organization.
Typical responsibilities are;
1. Select objective & scope
2.Organize team
3. Monitor Progress
4. Arrange for resources needed by team
5. Provide visible support for the belts
6. Ensure project Result hit the bottom line of company