The HIP6021 provides the power control and protection for four output voltages in high-performance, graphics intensive microprocessor and computer applications. The IC integrates a voltage-mode PWM controller and three linear controllers, as well as the monitoring and protection functions into a 28-pin SOIC package. The PWM controller regulates the microprocessor core voltage with a synchronous-rectified buck converter. The linear controllers regulate the computer system’s AGP 1.5V or 3.3V bus power, the 1.5V GTL bus power, and the 1.8V power for the North/South Bridge core voltage and/or cache memory circuits. The HIP6021 includes an Intel-compatible, TTL 5-input digital-to-analog converter (DAC) that adjusts the core PWM output voltage from 1.3VDC to 2.05VDC in 0.05V steps and from 2.1VDC to 3.5VDC in 0.1V increments. The precision reference and voltage-mode control provide ±1 static regulation.

特性 Features

? Provides 4 Regulated Voltages

- Microprocessor Core, AGP Bus, Memory, and GTL Bus Power

? Drives N-Channel MOSFETs

? Linear Regulator Drives Compatible with both MOSFET and Bipolar Series Pass Transistors

? Fixed or Externally Resistor-Adjustable Linear Outputs (FIX Pin)

? Simple Single-Loop Control Design

- Voltage-Mode PWM Control

? Fast PWM Converter Transient Response

- High-Bandwidth Error Amplifier

- Full 0 to 100 Duty Ratio

? 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 3.5VDC

? Power-Good Output Voltage Monitor

? Over-Voltage and Over-Current Fault Monitors

- Switching Regulator Does Not Require Extra Current

Sensing Element, Uses MOSFET’s rDS(ON)

? Small Converter Size

- Constant Frequency Operation

- 200kHz Free-Running Oscillator; Programmable From 50kHz to Over 1MHz

- Small External Component Count

? Pb-Free Available (RoHS Compliant)