HIP6018B
Advanced PWM and Dual Linear Power Control
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
- Pb-Free Available (RoHS Compliant)
Description
The HIP6018B 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 HIP6018B includes an Intel-compatible, TTL 5-input digital-to-analog converter (DAC) that adjusts the core PWM output voltage from 2.1VDC to 3.5VDC in 0.1V increments and from 1.3VDC to 2.05VDC 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 HIP6018B 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 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.
Applications
- Full Motherboard Power Regulation for Computers
- Low-Voltage Distributed Power Supplies
