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.

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)