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.

Features
• Provides 4 Regulated Voltages
    - Microprocessor Core, AGTL+ Bus, AGP Bus Power, and North/South Bridge Core
• Drives N-Channel MOSFETs
• Linear Regulator Drives Compatible with both MOSFET and Bipolar Series Pass Transistors
• Simple Single-Loop Control Design
    - Voltage-Mode PWM Control
• Fast PWM Converter Transient Response
    - High-Bandwidth Error Amplifier
    - Full 0% to 100% Duty Ratio
• Excellent Output Voltage Regulation
    - Core PWM Output: ±1% Over Temperature
    - All Other Outputs: ±3% Over Temperature
• VRM8.5 TTL-Compatible 5-Bit DAC Microprocessor Core Output Voltage Selection
    - Wide Range - 1.050V to 1.825V
• Power-Good Output Voltage Monitors
    - Separate delayed VTT Power Good
• Over-Voltage and Over-Current Fault Monitors
    - Switching Regulator Doesn’t Require Extra Current Sensing Element, Uses MOSFET’s rDS(ON)
• Small Converter Size
    - Constant Frequency Operation
    - 200kHz Internal Oscillator
• Pb-Free Available (RoHS Compliant)

Applications
• Motherboard Power Regulation for Computers