Overview

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.

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)

Comparison

Applications

Applications

  • Motherboard Power Regulation for Computers

Documentation

Type Title Date
Datasheet PDF 828 KB
End Of Life Notice PDF 320 KB
Product Change Notice PDF 98 KB
Application Note PDF 509 KB
Application Note PDF 397 KB
Other PDF 562 KB
6 items

Design & Development

Boards & Kits

Boards & Kits

Models