SC2441

Very Low Input Voltage 2-Phase Synchronous www.DataSheet4U.com Step-down Controllers with Step-up Converter POWER MANAGEMENT Description The SC2441 is a high-frequency triple output switching regulator controller. It consists of a dual out-of-phase synchronous step-down PWM controller with high-current output gate drives and a 1.7A integrated step-up switching regulator. The dual-phase step-down controller of the SC2441 can be configured to provide two individually controlled and regulated outputs or a single output with shared current in each phase. The buck controller can operate from an input voltage of at least 4.72V or they can run off a supply generated locally with the integrated boost regulator. This makes the SC2441 ideally suited for applications where a low-voltage input (3.3V, 2.5V, or 1.8V) is to be stepped down for lower voltage logic yet the input is too low to drive power MOSFET’s efficiently. The boost regulator can be used to provide a third auxiliary output while generating the bias for the buck controllers. Both the step-down controllers and the step-up regulator employ fixed frequency peak current-mode control for fast transient response. The master oscillator frequency can be programmed by the user. Individual soft-start and overload shutdown timer are employed in each step-down controller for hiccup overload protection. In single-output configuration, the channel 1 timer controls the soft-start and overload shutdown functions of both controllers. SC244...