General Description
The APW6020 provides the power control and protection for four output voltages in high-performance , graphics intensive microprocessor and computer applications. The IC integrates two voltage-mode PWM controllers and two linear controllers , as well as the monitoring and protection functions into a single package. One PWM controller regulates the microprocessor core voltage with a synchronous-rectified buck converter. The second PWM controller supplies the computer’s AGP 1.5V or 3.3V bus power with a standard Buck converter. The linear controllers requlate the power for the 1.5V GTL bus , and the 1.8V power for the North/South Bridge core voltage and/or cache memory circuits.

Features
• 4 Regulated Voltages are provided
    − Microprocessor Core (1.3V to 3.5V)
    − AGP Bus (1.5V or 3.3V)
    − Memory (1.8V) , GTL Bus (1.5V)
• Simple Single-Loop Control Designs Voltage-Mode PWM Control
• Fast PWM Converter Transient Response High-Bandwidth Error Amplifiers
    − Full 0% to 100% Duty Ratios
• Excellent Output Voltage Regulation
    − Core PWM Output : ± 1% Over Temperature
    − Other Outputs : ± 3% Over Temperature
• TTL-Compatible 5- Bit DAC Microprocessor Core Output Voltage Selection
    − Wide Range - 1.3VDC to 3.5 VDC
• Power-Good Output Voltage Monitor
• Over-Voltage and Over-Current Fault Monitors
• Small Converter Size
    − Constant Frequency Operation
    − 200kHz Free-Running Oscillator ; Programmable From 50kHz to Over 800kHz
    − Small External Component Count

Applications
• Motherboard Power Regulation for Computers