This slide shows a comparison of the LTC3870 to the LTC3874, LTC3880 and LTC3883. The LTC3874 is also a slave controller that is meant to be used with sub-milliohm DCR inductors. It has a lower input and output voltage capability, but has a better current sense offset accuracy. The LTC3880 and LTC3883 are full featured Digital Power System Management step-down controllers that can be used to extend the phase count, but have extra features that will not be used when designed in as a slave controller.