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