HIP6020A

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


Application

• Motherboard Power Regulation for Computers


Pinout




Specifications

Supply Voltage, V_CC . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . +15V
PGOOD, RT/FAULT, DRIVE, PHASE, and
GATE Voltage . . . . . . . . . . . . . . . . . . . GND - 0.3V to V_CC + 0.3V
Input, Output or I/O Voltage . . . . . . . . . . . . . . .GND -0.3V to 7V
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 1


Description

The HIP6020A provides the power control and protection for four output voltages in high-performance, graphics intensive microprocessor and computer applications. The HIP6020A 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.