A circuit comprising: a voltage reference generator having a plurality of voltage reference outputs, each voltage reference output having a selectable voltage level; a plurality of primary power controllers (302a, 302b, 302c, 302d), each primary power controller connected to receive a voltage reference level from one of the voltage reference outputs of the voltage reference generator, each primary power controller operative to generate switcher control signals that can control operation of a switcher circuit to produce an output voltage that is referenced to the voltage reference level; and a plurality of secondary power controllers (304a, 304b, 304c, 304d), each secondary power controller being associated with one of the primary power controllers, characterized in that: each secondary power controller operative to generate a load switch control signal that can control a load switch to produce, at a selectable slew rate, an output voltage that is referenced to the voltage reference level of the primary power controller that is associated with said each secondary power controller; and further comprising a slew rate controller operative to produce a slew signal, each secondary power controller (304a, 304b, 304c, 304d) comprising a driver that is selectively connected to and controlled by the slew signal to produce the load switch control signal. a voltage reference generator having a plurality of voltage reference outputs, each voltage reference output having a selectable voltage level; a plurality of primary power controllers (302a, 302b, 302c, 302d), each primary power controller connected to receive a voltage reference level from one of the voltage reference outputs of the voltage reference generator, each primary power controller operative to generate switcher control signals that can control operation of a switcher circuit to produce an output voltage that is referenced to the voltage reference level; and a plurality of secondary power controllers (304a, 304b, 304c, 304d), each secondary power controller being associated with one of the primary power controllers, characterized in that: each secondary power controller operative to generate a load switch control signal that can control a load switch to produce, at a selectable slew rate, an output voltage that is referenced to the voltage reference level of the primary power controller that is associated with said each secondary power controller; and further comprising a slew rate controller operative to produce a slew signal, each secondary power controller (304a, 304b, 304c, 304d) comprising a driver that is selectively connected to and controlled by the slew signal to produce the load switch control signal. each secondary power controller operative to generate a load switch control signal that can control a load switch to produce, at a selectable slew rate, an output voltage that is referenced to the voltage reference level of the primary power controller that is associated with said each secondary power controller; and further comprising a slew rate controller operative to produce a slew signal, each secondary power controller (304a, 304b, 304c, 304d) comprising a driver that is selectively connected to and controlled by the slew signal to produce the load switch control signal.