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The ISL6313B two-phase PWM control IC provides aprecision voltage regulaTIon system for advancedmicroprocessors. The integraTIon of power MOSFET driversinto the controller IC marks a departure from the separatePWM controller and driver configuraTIon of previousmulTI-phase product families. By reducing the number ofexternal parts, this integration is optimized for a cost andspace saving power management solution.One outstanding feature of this controller IC is itsmultiprocessor compatibility, allowing it to work with both Inteland AMD microprocessors. Included are programmable VIDcodes for Intel VR11 as well as AMD 5-bit and 6-bit DAC tables.A circuit is provided for remote voltage sensing, compensatingfor any potential difference between remote and local grounds.The output voltage can also be positively or negatively offsetthrough the use of a single external resistor.The ISL6313B also includes advanced control loop featuresfor optimal transient response to load apply and removal.One of these features is highly accurate, fully differential,continuous DCR current sensing for load line programmingand channel current balance. Active Pulse Positioning (APP)Modulation and Adaptive Phase Alignment (APA) are twoother unique features, allowing for quicker initial response tohigh di/dt load transients. With this quicker initial response toload transients, the number of output bulk capacitors can bereduced, helping to reduce cost.
