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6-Phase PWM Controller with Light Load Efficiency Enhancement and Current MonitoringThe ISL6336B controls microprocessor core voltageregulaTIon by driving up to 6 interleaved synchronous-recTIfiedbuck channels in parallel. MulTIphase buck converterarchitecture uses interleaved TIming to multiply channel ripplefrequency and reduce input and output ripple currents. Lowerripple results in fewer components, lower component cost,reduced power dissipation, and smaller implementation area.Microprocessor loads can generate load transients withextremely fast edge rates and require high efficiency overthe full load range. The ISL6336B utilizes Intersil’sproprietary Active Pulse Positioning (APP) and AdaptivePhase Alignment (APA) modulation scheme and aproprietary active phase dropping/adding and diodeemulation scheme to achieve extremely fast transientresponse with fewer output capacitors and high efficiencyfrom light load to full load.The ISL6336B is compliant with Intel’s VR11.1 specification.Features include a pin (IMON) for current monitoring and aPower State Indicator (PSI#) input pin to initiate a proprietaryphase dropping and diode emulation scheme for higherefficiency at light load by dropping to 1- or 2-phase operationwith optional diode emulation to reduce switching and corelosses in the converter. After the PSI# signal is de-asserted,the dropped phase(s) are added back to sustain heavy loadtransient and efficiency.
