The ISL6333 three-phase PWM family of control ICs provide
a precision voltage regulation system for advanced
microprocessors. 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. By reducing the number of external
parts, this integration is optimized for a cost and space
saving power management solution.
The ISL6333 controllers are designed to be compatible with
Intel VR11.1 Applications. Features that make these controllers
compatible include an IMON pin for output current monitoring,
and a Power State Indicator (PSI#) pin for phase dropping and
higher efficiency during light load states. An 8-bit VID input is
used to select the desired output voltage from the VR11 DAC
table. A circuit is provided for remote voltage sensing,
compensating for any potential difference between remote and
local grounds. The output voltage can also be positively or
negatively offset through the use of a single external resistor.