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The HIP6018 provides the power control and protection for three output voltages in high-performance microprocessor and computer applications. The IC integrates a PWM controllers, a linear regulator and a linear controller as well as the monitoring and protection functions into a single package. The PWM controller regulates the microprocessor core voltage with a synchronous-rectified buck converter. The linear controller regulates power for the GTL bus and the linear regulator provides power for the clock driver circuit.

The HIP6018 includes an Intel-compatible, TTL 5-input digital-to-analog converter (DAC) that adjusts the core PWM output voltage from 2.1V_DC to 3.5V_DC in 0.1V increments and from 1.8V_DC to 2.05V_DC in 0.05V steps. The precision reference and voltage-mode control provide ±1% static regulation. The linear regulator uses an internal pass device to provide 2.5V±2.5%. The linear controller drives an external N-channel MOSFET to provide 1.5V±2.5%.

The HIP6018 monitors all the output voltages. A single Power Good signal is issued when the core is within ±10% of the DAC setting and the other levels are above their under- voltage 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 overcurrent 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 3 Regulated Voltages
  • Microprocessor Core, Clock and GTL Power
• Drives N-Channel MOSFETs
• Operates from +3.3V, +5V and +12V Inputs
• Simple Single-Loop PWM Control Design
  • Voltage-Mode Control
• Fast Transient Response
  • High-Bandwidth Error Amplifier
  • Full 0% to 100% Duty Ratios
• Excellent Output Voltage Regulation
  • Core PWM Output: ±1% Over Temperature
  • Other Outputs: ±2.5% Over Temperature
• TTL-compatible 5-Bit Digital-to-Analog Core Output Voltage Selection
  • Wide Range 1.8VDC to 3.5VDC
  • 0.1V Steps 2.1VDC to 3.5VDC
  • 0.05V Steps 1.8VDC to 2.05VDC
• Power-Good Output Voltage Monitor
• Microprocessor Core Voltage Protection Against Shorted MOSFET
• Over-Voltage and Over-Current Fault Monitors
  • 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

Applications

• Full Motherboard Power Regulation for Computers
• Low-Voltage Distributed Power Supplies