Description
The SC2441A is a programmable frequency dual independent or dual/multiple phase single output peak current-mode step-down switching regulator controller. It is capable of operating from 1.8V to 20V input. A 0.6A step-up converter in the SC2441A generates an auxiliary gate drive supply when VIN is below 4.5V. This makes the SC2441A well suited for applications where a low-voltage input (<3.3V) is to be stepped down for lower voltage logic, yet the input is too low to drive power MOSFETs efficiently.

Features
2-Phase Synchronous Step-down Controllers
◆ 2-Phase Synchronous Continuous Conduction Mode
◆ Out of Phase Operation for Low Input Current Ripple
◆ Operates up to 1MHz Per Channel
◆ Excellent Current Sharing Between Phases
◆ Duty Cycle Up to 90%
◆ 0.5V Feedback voltages for Low-Voltage Outputs
◆ Starts into Pre-biased Outputs
◆ Adaptive Shoot-through Protection
◆ Lossless Inductor DCR Current Sensing
◆ 23mV Current-limit Threshold
◆ Individual Soft-start, Overload Hiccup and Enable

Step-up Regulator
◆ 0.27V VCESAT Switch at 0.6A
◆ Fixed frequency Current-mode Control

Common Features
◆ Wide input Voltage Range: 1.8V to 20V
◆ Synchronizing Frequency Equal to that of the Stepdown Converters
◆ 28-lead TSSOP-EDP Lead-free package, fully WEEE and RoHS compliant

Applications
◆ Low voltage distributed DC-DC converters
◆ Telecommunication power supplies
◆ Servers and base stations