All-power control for AMD Athlon 64 designs

Edited by the Electronicstalk editorial team Nov 4, 2003

The Endura ISL6244 is a new multiphase synchronous-buck PWM controller with a 5bit voltage identification (VID) input optimised for new AMD Athlon 64 processors used in notebook PCs.

The Endura ISL6244 is a new multiphase synchronous-buck PWM controller with a 5bit voltage identification (VID) input optimised for new AMD Athlon 64 processors used in notebook PCs.

When combined with Intersil's mosfet driver ICs, the ISL6244 provides the industry's most precise voltage regulation at +/-1%.

The 32-pad quad flat no-lead (QFN) package, also available lead-free, saves space and offers enhanced thermal efficiency.

The ISL6244 is a two- to four-phase synchronous-buck PWM controller that drives up to four of Intersil's mosfet drivers (ISL6206 and ISL6207) to form a precision multiphase DC/DC convertor.

Active channel-current balancing is achieved using precision lossless on-resistance (lower mosfet on-resistance) current sensing, which also reduces parts count and solution cost.

The ISL6244 has a 5bit VID input used to deliver dynamic, on-the-fly, adjustment of core voltage over the range of 0.80 to 1.55V in 25mV steps.

Voltage and current feedback are actively monitored to detect fault conditions.

A power good output indicates that the controller is operating properly and the output voltage is within a set window, as determined by undervoltage and overvoltage comparators.

The controller provides overcurrent protection by monitoring individual channel current and will shut down if any of the channel currents exceeds a reference current.

The ISL6244 also allows selection of channel switching frequency in the range of 80kHz to 1MHz.