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