RT8207 PDF Datasheet


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Description

This is Complete DDRII/DDRIII Memory Power Supply Controller. RT8207 Complete DDRII, DDRIII Memory Power Supply Controller General Description The RT8207 provides a complete power supply for both DDRII, DDRIII memory systems. It integrates a synchronous PWM buck controller with a 3A sink, source tracking linear regulator and a buffered low noise reference. The PWM controller provides the high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high-voltage batteries to generate low voltage chipset RAM supplies in notebook computers. The constant-on-time PWM control scheme handles wide input, output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency. The RT8207 achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by its ability to drive very large synchronous rectifier MOSFETs. The buck conversion allows this de.