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The HIP6020A provides the power control and protection for four output voltages in high-performance, graphics intensive microprocessor and computer applications. The IC integrates two PWM controllers and two linear controllers, as well as the monitoring and protection functions into a 28-pin SOIC package. One PWM controller regulates the microprocessor core voltage with a synchronous-rectified buck converter. The second PWM controller supplies the computer system's AGP 1.5V or 3.3V bus power with a standard buck converter. The linear controllers regulate power for the 1.5V GTL bus and the 1.8V power for the North/South Bridge core voltage and/or cache memory circuits.

The HIP6020A 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. The second PWM controller's output is userselectable, through a TTL-compatible signal applied at the SELECT pin, for levels of 1.5V (±3%) or fully ON switch. The linear regulators use external N-Channel MOSFETs or bipolar NPN pass transistors to provide output voltages of 1.5V ±3% (VOUT3) and 1.8V ±3% (VOUT4). The HIP6020A monitors all the output voltages. A single Power Good signal is issued when the core is within ±10% of the DAC setting and all other outputs are above their undervoltage levels. Additional built-in over-voltage protection for the core output uses the lower MOSFET to prevent output voltages above 115% of the DAC setting. The PWM controllers' over-current function monitors the output current by using the voltage drop across the upper MOSFET's rDS(ON), eliminating the need for a current sensing resistor.

Key Features

• Provides 4 Regulated Voltages
  • Microprocessor Core, AGP Bus, North/South Bridge and/or Cache Memory, and GTL Bus Power
• Drives N-Channel MOSFETs
• Linear Regulator Drives Compatible with both MOSFET and Bipolar Series Pass Transistors
• 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
  • AGP Bus PWM Output: ±3% Over Temperature (1.5V Setting Only)
  • 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 Regulators Use MOSFET's rDS(ON) Sensing
• Small Converter Size
  • Constant Frequency Operation
  • 200kHz Free-Running Oscillator; Programmable From 50kHz to Over 1MHz
  • Small External Component Count