The ISL6263D IC is a Single-Phase Synchronous Buck PWM voltage regulator for GPU core power applications. It features Intersil’s Robust Ripple Regulator (R³) Technology™. Integrated current monitor, differential remote sense amplifier, MOSFET driver and bootstrap diode result in smaller implementation area and lower component cost.

Intersil’s R³ Technology™ combines the best features of both fixed-frequency PWM and hysteretic PWM, delivering excellent light-load efficiency and superior load transient response by commanding variable switching frequency during the transitory event. For maximum conversion efficiency, the ISL6263D automatically enters Diode Emulation Mode (DEM) when the inductor current attempts to flow negative. DEM is highly configurable and easy to set-up. A PWM filter can be enabled, which prevents the switching frequency from entering the audible spectrum as a result of extremely light load while in DEM.

The GPU core voltage can be dynamically programmed from 0.7V to 1.0875V by the three VID input pins without requiring sequential stepping of the VID states. The ISL6263D requires only one capacitor for both the soft-start slew-rate and the dynamic VID slew-rate by internally connecting the SOFT pin to the appropriate current source. The voltage Kelvin sensing is accomplished with an integrated unity-gain true differential amplifier.