Renesas Electronics Corporation 4+3 Multiphase PWM Regulator for Intel IMVP8™ Desktop CPUs ISL95856HRZ

Compliant with Intel IMVP8™, the ISL95856 provides a complete power solution for desktop microprocessors supporting both the core (IA) and graphics (GT) rails. The controller provides control and protection for one Voltage Regulator (VR), which can be configured for 4-, 3-, 2- or 1-phase operation. The second VR is configurable for 3-, 2- or 1-phase operation. The VRs feature a programmable SVID address to allow maximum flexibility in supporting desktop processor SKUs. Both controller outputs share a common serial control bus to communicate with the CPU and achieve lower cost and smaller board area compared with a two-chip approach. Based on Intersil’s Robust Ripple Regulator R3™ technology, the R3™ modulator has many advantages compared to traditional modulators. These include faster transient settling time, variable switching frequency in response to load transients and improved light-load efficiency due to diode emulation mode with load-dependent low switching frequency. The ISL95856 has several other key features. The controller features three integrated +12V gate drivers with two drivers on the VR B output. The controller supports either DCR current sensing with a single NTC thermistor for DCR temperature compensation or more precision through resistor current sensing, if desired. Both outputs feature remote voltage sense, programmable IMAX, adjustable switching frequency, OC protection and single VR_READY power-good indicator.