Triple Output Controllers
Semtech announces the SC2441, a very low input voltage, two-phase synchronous step-down controller with an integrated step-up converter. The dual-phase, step-down controller can be configured to supply two individually controlled and regulated 20 A outputs, 180 degrees out-of-phase or, alternatively, the two phases can be interleaved into one low-ripple 40 A output. Moreover, the SC2441's integrated boost step-up switching regulator offers an additional output or can be used to generate a bias supply to drive the gates of MOSFETs at low input voltage conditions. Other SC2441 features include individual, per-phase soft-start and overload timers; programmable fixed switching frequency up to 1 MHz; up to a 90% duty cycle, and an individual enable pin for controlling power sequencing of each phase.