VRM8.5 Dual PWM And Dual Linear Power System Controller

The ISL6523 provides the power control and protection for four output voltages in high-performance Microprocessor and computer applications. The IC integrates two PWM Controllers and two linear controllers, as well as the monitoring and protection functions into a 28-pin SOIC package. One PWM Controller regulates the Microprocessor core voltage with a synchronous-rectified buck converter. The second PWM Controller supplies the computer systems AGTL+ 1.2V bus power with a standard buck converter. The linear controllers regulate power for the 1.5V AGP bus and the 1.8V power for the chipset core voltage and/or cache memory circuits.
The ISL6523 includes an Intel VRM8.5 compatible, TTL 5- input digital-to-analog converter (DAC) that adjusts the Microprocessor core-targeted PWM output voltage from 1.050V to 1.825V in 25mV steps. The precision reference and voltage-mode control provide 1% static regulation. The second PWM Controllers output provides a voltage level of 1.2V with 3% accuracy. The linear Regulators use external N-Channel MOSFETs or bipolar NPN pass Transistors to provide fixed output voltages of 1.5V 3% (VOUT3) and 1.8V 3% (VOUT4).
The ISL6523 monitors all the output voltages. A delayedrising VTT (standard buck output) Power Good signal is issued before the core PWM starts to ramp up. Another system Power Good signal is issued when the core is within 10% of the DAC setting and all other outputs are above their under- voltage levels. Additional built-in overvoltage protection for the core output uses the lower MOSFET to prevent output voltages above 115% of the DAC setting. The PWM Controllers overcurrent function monitors the output current by using the voltage drop across the upper MOSFETs rDS(ON), eliminating the need for a current sensing resistor.
By Intersil Corporation
ISL6523 's PackagesISL6523 's pdf datasheet

ISL6523 Pinout, Pinouts
ISL6523 pinout,Pin out
This is one package pinout of ISL6523,If you need more pinouts please download ISL6523's pdf datasheet.

ISL6523 Application circuits
ISL6523 circuits
This is one application circuit of ISL6523,If you need more circuits,please download ISL6523's pdf datasheet.

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