ATA / SATA RAID-5 solutions

I'm surfing for a ATA/SATA RAID-5 controller for use with Linux. I need it to be "transparent" in the way that all disk activity must be taken care of on board by the controller. No software must be involved in taking care of the RAID subsystem. So, 100% hardware RAID, it must be bootable, i.e. look like one single disk to the system. Can I please get some guidance to what solutions there are? Anders Norrbring