DESCRIPTION
The AIC1573 combines two PWM voltage mode controllers and two linear controllers as well as the monitoring and protection functions in this chip. One PWM controller regulates the microprocessor core voltage with a synchronous rectified buck converter. The second PWM controller provides AGP bus 1.5V or 3.3V power with a standard buck converter. Two linear controllers regulate power for the 1.5V GTL bus and 1.8V power for the chip set core voltage and/or cache memory circuits.

FEATURES
• Compatible with HIP6020.
• Provides 4 Regulated Voltages for Microprocessor Core, AGP Bus, Memory and GTL Bus Power.
• TTL Compatible 5-bit Digital-to-Analog Core Output Voltage Selection. Range from 1.3V to 3.5V. 0.1V Steps from 2.1V to 3.5V. 0.05V Steps from 1.3V to 2.05V.
• ±1.0% PWM Output Voltage for VCORE.
• ±3% PWM Output Voltage for AGP Bus.
• ±3.0% Reference Voltage for Chipset and/or Cache Memory and VGTL.
• Simple Voltage-Mode PWM Control with Built in Internal Compensation Networks.
• N-Channel MOSFET Driver for PWM buck converters.
• Linear Controller Drives Compatible with both N– Chanel MOSFET and NPN Bipolar Series Pass Transistor.
• Operates from +3.3V, +5V and +12V Inputs.
• Fast Transient Response.
• Full 0% to 100% Duty Ratios.
• Adjustable Current Limit without External Sense Resistor.
• Microprocessor Core Voltage Protection against Upper MOSFET shorted to +5V.
• Power Good Output Voltage Monitor.
• Over-Voltage and Over-Current Fault Monitors.
• 200KHz Free-Running Oscillator Programmable up to 700KHz. n

APPLICATIONS
• Full Motherboard Power Regulation for Computers.