The ISL6552 multiphase PWM control IC, together with its companion gate driver, HIP6601, HIP6602 or HIP6603 and an external Intersil MOSFET, provides high precision voltage regulation for advanced microprocessors. Multiphase power conversion is a marked departure from the earlier single-phase converter configurations employed to meet the increasing current demands of modern microprocessors. Multiphase converters that dissipate less power and load current result in lower cost transistors with fewer input and output capacitors. These cuts are interleaved due to the process of this topology switching from higher effective accumulation of higher frequency ripple current. For example, a three-phase converter operating at 350kHz has a ripple frequency of 1.05MHz. Additionally, the greater converter bandwidth of this design results in a faster response to load transients. Outstanding features of this controller IC include a system accuracy of ±1% from the microprocessor's programmable VID code ranging from 1.05V to 1.825V. These VID pins pull up current, eliminating the need for external pull-up resistors. Additionally, "drop" compensation, used to reduce overshoot or shoot core voltage, is easily programmed with a single resistor. Another feature of this controller IC is that the PGOOD display holds the circuit until the low core voltage increases, during the soft-start process, to be at 10% of the programming voltage. Overvoltage, 15% above the programmed core voltage, results in the converter turning off to lower MOSFETs to clamp and protect the microprocessor. The voltage also found PGOOD low as a result if the core voltage dropped 10% below the programmed level. Overcurrent protection reduces regulated RMS output current by 41%. The programmed overcurrent trip value. These functions provide monitoring and protection systems for microprocessors and power supplies.