The ISL6308 from Intersil is a new three-phase PWM control IC with integrated MOSFET drivers. The integration of power MOSFET drivers into the controller IC marks a departure from the separate PWM controller and driver configuration of previous multiphase product families. Output voltage can be programmed using the on-chip DAC or an external precision reference. A two bit code programs the DAC reference to one of four possible values (0,6 V, 0,9 V, 1,2 V and 1,5 V). A unity gain, differential amplifier is provided for remote voltage sensing, compensating for any potential difference between remote and local grounds. The output voltage can also be offset through the use of a single external resistor. An optional droop function is also implemented and can be disabled for less stringent applications. A unique feature of the ISL6308 is the combined use of both inductor DCR and rDS(ON) current sensing.
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