SC2447 Datasheet | SEMTECH

Description The SC2447 is a versatile high-frequency dual phase PWM step-down controller optimized for Philips and Renesas Dr MOSTM. Both phases are capable of sourcing or sinking load currents, making the SC2447 suitable for networking system power and DDR applications. The SC2447 employs fixed frequency, continuous-conduction peak current-mode control for easy pensation and fast transient response. The SC2447 can be used to generate two independent outputs (up to 30A per output) or a single 60A output with shared phase current. The PWM signals are 180° out of phase to minimize input/output ripple. Either inductor DC resistance or precision sense resistor can be used for current-mode control. Inductor DC resistance sensing has the advantage of being lossless. Each phase has individual closed-loop soft-start and overload shutdown timer. The SC2447 powers up neatly with pre-biased output. It has tri-state shutdown and hiccup overload protection. In two-phase single-output configuration, the master timer controls the soft-start and overload shutdown functions. The SC2447 is in a lead-free, WEEE and Ro HS pliant, TSSOP-28 package. Features 2-Phase Step-down Controller optimized for Philips or Renesas Dr MOSTM Out of Phase Operation for Low Input Current Ripple Outputs Source and Sink Current Fixed Frequency Peak Current-Mode Control Lossless Inductor DCR Current Sensing Optional Resistor Current-Sensing for Precise Current-Limit Dual 30A Outputs or 2-Phase 60A Single Output Operation Wide Input Voltage Range: 4.65V to 15V Individual Closed-Loop Soft-Start, Overload Shutdown Timer and Enable Output Voltage as Low as 0.5V Starts into Pre-Bias Output Tri-State PWM Output during Shutdown Programmable Frequency Up to 1MHz Per Phase External Synchronization TSSOP-28 Lead-free Package. Fully WEEE and Ro HS pliant Applications Telemunication Power Supplies DDR Memory Power Supplies Graphic Power Supplies Servers and Base Stations Typical Application Circuit VIN 12V...