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The HIP6019 provides the power control and protection for four output voltages in high-performance microprocessor and computer applications. The IC integrates two PWM controllers, a linear regulator and a linear controller as well as the monitoring and protection functions into a single 28 lead SOIC package. One PWM controller regulates the microprocessor core voltage with a synchronous-rectified buck converter, while the second PWM controller supplies the computer's 3.3V power with a standard buck converter. The linear controller regulates power for the GTL bus and the linear regulator provides power for the clock driver circuits.

The HIP6019 includes an Intel-compatible, TTL 5-input digitalto- analog converter (DAC) that adjusts the core PWM output voltage from 2.1VDC to 3.5VDC in 0.1V increments and from 1.8VDC to 2.05VDC in 0.05V steps. The precision reference and voltage-mode control provide ±1% static regulation. The second PWM controller is user-adjustable for output levels between 3.0V and 3.5V with ±2% accuracy. The adjustable linear regulator uses an internal pass device to provide 2.5V ±2.5%. The adjustable linear controller drives an external NChannel MOSFET to provide 1.5V ±2.5%.

The HIP6019 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 controller's overcurrent functions monitor the output current by sensing 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, I/O, Clock Chip and GTL Bus
• Drives N-Channel MOSFETs
• Operates from +5V and +12V Inputs
• Simple Single-Loop Control Designs
  • Voltage-Mode PWM Control
• Fast Transient Response
  • High-Bandwidth Error Amplifiers
  • Full 0% to 100% Duty Ratios
• Excellent Output Voltage Regulation
  • Core PWM Output: ±1% Over Temperature
  • I/O PWM Output: ±2% 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 1MHz

Applications

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