SC458 Complete Dual-Phase Low VOUT Power Supply Controller
● Description:
■ The SC458 is a single chip high-performance PWM controller designed to power advanced processors. On-chip support is provided for Active Voltage Positioning, “VID on-the-fl y” transitions, single and dual phase control.
■ The SC458 implements hysteretic control technology which provides the fastest possible transient response while avoiding the stability issues inherent to classical PWM controllers. Semtech’s proprietary Combi-Sense®technology provides a loss-less current sensing scheme which is extremely robust and easy to lay out. 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 capacitive turn-on of the low side MOSFET, while also increasing overall efficiency.
■ Hysteretic operation adaptively reduces the SC458 switching frequency at light loads. Combined with an automatic “power-save” mode which prevents negative current fl ow in the low-side FET, system efficiency is significantly enhanced during light loading conditions. The SC458 changes from dual-phase to single-phase operation whenever DUAL transitions low, providing optimal effi ciency across the entire power range. A second low power control pin, DRIFT, allows the output voltage to be discharged by the load during a negative voltage transition.
■ A 7-bit DAC, accurate to 0.85%, sets the output voltage reference, and implements a 0.300V to 1.500V range. 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, dual (delayed, and not delayed) power good outputs, dynamic current sharing, over voltage and programmable over current protection. The SC458 is available in a space- saving 44 pin MLP package.
● Features:
■ Dual-Phase Solution with Integrated Drivers
■ Hysteretic Control for Fast Transient Response
■ Combi-Sense Loss-Less Current Sensing
■ Dynamic Current Sharing
■ Active Voltage Positioning
■ True Differential Remote Sensing
■ Dual Power Good Outputs
■ Programmable Soft-Start and DAC Slew Control
■ Programmable OCP Threshold
■ Supports all Ceramic Decoupling Solutions
■ 44 pin MLP (7x7 mm)
■ Product is WEEE and RoHS Compliant
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[ Graphics ][ Processor Cores ][ Notebook PCs ][ Embedded Applications ] |
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Datasheet |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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October 31, 2006 |
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391 KB |
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