DESCRIPTION

The AIC1571 combines a synchronous voltage mode controller with two linear controllers as well as the monitoring and protection functions in this chip. The PWM controller regulates the microprocessor core voltage with a synchronous rectified buck converter. One linear controller regulates power for the GTL bus and the other linear controller provides power for the clock driver circuit or memory (1.8V)

FEATURES

? Provides 3 Regulated Voltages for Microprocessor Core, Clock and GTL Power.

? Simple Voltage-Mode PWM Control.

? Dual N-Channel MOSFET Synchronous Driver.

? Operates from +3.3V, +5V and +12V Inputs.

? Fast Transient Response.

? Full 0 to 100 Duty Ratios.

? ±1.0 Output Voltage for VCORE and ±2.0 Output Voltage Reference for VCLK and VGTL.

? 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.

? Adjustable Current Limit without External Sense Resistor.

? Microprocessor Core Voltage Protection against Shorted MOSFET.

? Power Good Output Voltage Monitor.

? Over-Voltage and Over-Current Fault Monitors.

? 200KHz Free-Running Oscillator Programmable up to 350KHz.

APPLICATIONS

? Full Motherboard Power Regulation for Computers.

? Power Integrations for 3 Output Power System.