Three-Phase Buck PWM Controller withHigh Current Integrated MOSFET DriversThe ISL6308A is a three-phase PWM control IC withintegrated MOSFET drivers. It provides a precision voltageregulation system for multiple applications including, but notlimited to, high current low voltage point-of-load converters,embedded applications and other general purpose lowvoltage medium to high current applications.The integrationof power MOSFET drivers into the controller IC marks adeparture from the separate PWM controller and driverconfiguration of previous multi-phase product families. Byreducing the number of external parts, this integration allowsfor a cost and space saving power management solution.Output voltage can be programmed using the on-chip DACor an external precision reference. A two bit code programsthe DAC reference to one of 4 possible values (0.6V,0.9V,1.2V and 1.5V). A unity gain, differential amplifier isprovided for remote voltage sensing, compensating for anypotential difference between remote and local grounds. Theoutput voltage can also be offset through the use of singleexternal resistor. An optional droop function is alsoimplemented and can be disabled for applications havingless stringent output voltage variation requirements orexperiencing less severe step loads.
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