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SC473EVB Datasheet(PDF) 1 Page - Semtech Corporation |
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SC473EVB Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 18 page  www.semtech.com 1 SC473 Single-Phase Single Chip Graphics Core Power Supply Updated - Aug 17, 2006 POWER MANAGEMENT Applications Description Features The SC473 is a single-phase chip, high-performance PWM controller designed to power advanced graphic cores. On- chip support is provided that includes slew-rate controlled VID transitions. The SC473 implements hysteretic control technology which provides the fastest possible transient response while avoiding the stability issues inherent to classical PWM controllers. Eliminating the sense resistors reduces costs and PCB area, plus increases system efficiency. Integrated SmartDriver™ technology initially turns on the high-side driver with ‘soft’ drive to reduce ringing, EMI, and capaci- tive turn-on of the low side MOSFET, while also increasing overall efficiency. Hysteretic operation adaptively reduces the SC473 switch- ing frequency at light loads. Combined with an automatic “powersave” mode which prevents negative current flow in the low-side FET, system efficiency is significantly enhanced during light loading conditions. A 5-bit DAC, accurate to 0.85%, sets the output voltage reference, and implements the voltage range required by the processor. The DAC slew rate is externally programmed to minimize transient currents and audible noise. True differential remote sensing provides accurate point-of-load regulation at the processor die. Other features include programmable soft-start, an open-drain PWRGD output, dual-level over-voltage and programmable over-current pro- tection. The SC473 is available in a space-saving 4x4mm, 24-pin MLP package. Single-Phase Solution with Integrated Drivers Hysteretic Control for Fast Transient Response SmartDriver™ for reduced EMI True Differential Remote (die) Sensing VID Programmed Voltage Delayed Power Good Signal with Blanking Programmable Soft-Start and DAC Slew Control Programmable OCP Threshold Supports all Ceramic Decoupling Solutions 24-Pin MLP (4x4) Lead-Free Package RoHS and WEEE compliant High Performance Graphics Embedded Applications |
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