ISL6524中文资料VRM8.5 PWM and Triple Linear Power System Controller数据手册Renesas规格书

描述 Description

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The ISL6524 provides the power control and protection for four output voltages in high-performance microprocessor and computer applications. The IC integrates one PWM controller and three linear controllers, as well as the monitoring and protection functions into a 28-pin SOIC package. The PWM controller regulates the microprocessor core voltage with a synchronous-rectified buck converter. One linear controller supplies the computer system's AGTL+ 1. 2V bus power. The other two linear controllers regulate power for the 1. 5V AGP bus and the 1. 8V power for the chip set core voltage and/or cache memory circuits. The ISL6524 includes an Intel VRM8. 5 compatible, TTL 5-input digital-to-analog converter (DAC) that adjusts the microprocessor core-targeted PWM output voltage from 1. 050V to 1. 825V in 25mV steps. The precision reference and voltage-mode control provide ±1% static regulation. The linear regulators use external N-channel MOSFETs or bipolar NPN pass transistors to provide fixed output voltages of 1. 2V ±3% (VOUT2), 1. 5V ±3% (VOUT3) and 1. 8V ±3% (VOUT4). The ISL6524 monitors all the output voltages. A delayedrising VTT (VOUT2 output) Power Good signal is issued before the core PWM starts to ramp up. Another system Power Good signal is issued when the core is within ±10% of the DAC setting and all other outputs are above their under- voltage levels. Additional built-in overvoltage protection for the core output uses the lower MOSFET to prevent output voltages above 115% of the DAC setting. The PWM controller's 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.

特性 Features

• Provides 4 Regulated Voltages
• Microprocessor Core, AGTL+ Bus, AGP Bus Power, and North/South Bridge Core
• Drives N-Channel MOSFETs
• Linear Regulator Drives Compatible with both MOSFET and Bipolar Series Pass Transistors
• Simple Single-Loop Control Design
• Voltage-Mode PWM Control
• Fast PWM Converter Transient Response
• High-Bandwidth Error Amplifier
• Full 0% to 100% Duty Ratio
• Excellent Output Voltage Regulation
• Core PWM Output: ±1% Over Temperature
• All Other Outputs: ±3% Over Temperature
• VRM8.5 TTL-Compatible 5-Bit DAC Microprocessor Core Output Voltage Selection
• Wide Range - 1.050V to 1.825V
• Power-Good Output Voltage Monitors
• Separate delayed VTT Power Good
• Overcurrent Fault Monitor
• Switching Regulator Doesn't Require Extra Current Sensing Element, Uses MOSFET's rDS(ON)
• Small Converter Size
• Constant Frequency Operation
• 200kHz Internal Oscillator
• Pb-Free Available (RoHS Compliant)

应用 Application

• Motherboard Power Regulation for Computers