VRM8.5 PWM And Triple Linear Power System Controller

The ISL6524A provides the power control and protection for four output voltages in high-performance Microprocessor and computer applications. The IC integrates one PWM Controller and three linear controllers, as well as the monitoring and protection functions into a 28-pin SOIC package. The PWM Controller regulates the Microprocessor core voltage with a synchronous-rectified buck converter. One linear controller supplies the computer system's AGTL+ 1.2V bus power. The other two 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 ISL6524A 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 linear Regulators use external N-Channel MOSFETs or bipolar NPN pass Transistors to provide fixed output voltages of 1.2V 3% (VOUT2), 1.5V 3% (VOUT3) and 1.8V 3% (VOUT4).
The ISL6524A monitors all the output voltages. A delayedrising VTT (VOUT2 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 over-voltage protection for the core output uses the lower MOSFET to prevent output voltages above 115% of the DAC setting. The PWM controllers' over-current function monitors the output current by using the voltage drop across the upper MOSFET's rDS(ON), eliminating the need for a current sensing resistor.
By Intersil Corporation
ISL6524A 's PackagesISL6524A 's pdf datasheet

ISL6524A Pinout, Pinouts
ISL6524A pinout,Pin out
This is one package pinout of ISL6524A,If you need more pinouts please download ISL6524A's pdf datasheet.

ISL6524A Application circuits
ISL6524A circuits
This is one application circuit of ISL6524A,If you need more circuits,please download ISL6524A's pdf datasheet.

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