DATASHEET ISL6524 FN9015 Rev 3.00 VRM8.5 PWM and Triple Linear Power System Controller Apr 18, 2005 The ISL6524 provides the power control and protection for Features four output voltages in high-performance microprocessor Provides 4 Regulated Voltages and computer applications. The IC integrates one PWM - Microprocessor Core, AGTL+ Bus, AGP Bus Power, controller and three linear controllers, as well as the and North/South Bridge Core monitoring and protection functions into a 28-pin SOIC Drives N-Channel MOSFETs package. The PWM controller regulates the microprocessor core voltage with a synchronous-rectified buck converter. Linear Regulator Drives Compatible with both MOSFET One linear controller supplies the computer systems AGTL+ and Bipolar Series Pass Transistors 1.2V bus power. The other two linear controllers regulate Simple Single-Loop Control Design power for the 1.5V AGP bus and the 1.8V power for the chip - Voltage-Mode PWM Control set core voltage and/or cache memory circuits. Fast PWM Converter Transient Response The ISL6524 includes an Intel VRM8.5 compatible, TTL - High-Bandwidth Error Amplifier 5-input digital-to-analog converter (DAC) that adjusts the - Full 0% to 100% Duty Ratio microprocessor core-targeted PWM output voltage from 1.050V to 1.825V in 25mV steps. The precision reference and Excellent Output Voltage Regulation voltage-mode control provide 1% static regulation. The linear - Core PWM Output: 1% Over Temperature regulators use external N-channel MOSFETs or bipolar NPN - All Other Outputs: 3% Over Temperature pass transistors to provide fixed output voltages of 1.2V 3% VRM8.5 TTL-Compatible 5-Bit DAC Microprocessor Core (V ), 1.5V 3% (V ) and 1.8V 3% (V ). OUT2 OUT3 OUT4 Output Voltage Selection The ISL6524 monitors all the output voltages. A delayed- - Wide Range - 1.050V to 1.825V rising VTT (V output) Power Good signal is issued OUT2 Power-Good Output Voltage Monitors before the core PWM starts to ramp up. Another system - Separate delayed VTT Power Good Power Good signal is issued when the core is within 10% of Overcurrent Fault Monitor the DAC setting and all other outputs are above their under- voltage levels. Additional built-in overvoltage protection for - Switching Regulator Doesnt Require Extra Current Sensing Element, Uses MOSFETs r the core output uses the lower MOSFET to prevent output DS(ON) voltages above 115% of the DAC setting. The PWM Small Converter Size controllers overcurrent function monitors the output current - Constant Frequency Operation by using the voltage drop across the upper MOSFETs - 200kHz Internal Oscillator r , eliminating the need for a current sensing resistor. DS(ON) Pb-Free Available (RoHS Compliant) Applications Ordering Information Motherboard Power Regulation for Computers TEMP. PKG. PART NUMBER RANGE (C) PACKAGE DWG. Pinout ISL6524 (SOIC) TOP VIEW ISL6524CB* 0 to 70 28 Ld SOIC M28.3 DRIVE2 1 28 VCC ISL6524CBZ* 0 to 70 28 Ld SOIC M28.3 FIX 2 27 UGATE (See Note) (Pb-free) VID3 3 26 PHASE ISL6524CBZA* 0 to 70 28 Ld SOIC M28.3 VID2 4 25 LGATE (See Note) (Pb-free) VID1 5 24 PGND ISL6524EVAL1 Evaluation Board VID0 6 23 OCSET *Add -T suffix for tape and reel. VID25 7 22 VSEN1 NOTE: Intersil Pb-free products employ special Pb-free material PGOOD 8 21 FB sets molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible VTTPG 9 20 COMP with both SnPb and Pb-free soldering operations. Intersil Pb-free 19 FAULT/RT 10 VSEN3 products are MSL classified at Pb-free peak reflow temperatures that 18 DRIVE3 VSEN2 11 meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. SS24 12 17 GND SS13 13 16 VAUX VSEN4 14 15 DRIVE4 FN9015 Rev 3.00 Page 1 of 17 Apr 18, 2005ISL6524 FN9015 Rev 3.00 Page 2 of 17 Apr 18, 2005 Block Diagram VSEN1 OCSET VCC VSEN3 1.5V or 1.26V VAUX EA3 - DRIVE3 POWER-ON + VAUX x0.75 UV3 - RESET (POR) + x 200A 1.10 + - x0.75 UV4 + + DRIVE4 - - EA4 + + - x 0.90 1.8V or 1.26V VSEN4 PGOOD - + FIX - x 1.15 INHIBIT VCC OV DRIVE1 SOFT- UGATE START AND FAULT OC DRIVE2 + LOGIC - PHASE FAULT VSEN2 - GATE + + EA2 + CONTROL - VCC - EA1 VCC PWM PWM UV2 COMP LGATE x0.90 SYNCH DRIVE + PGND SET 1.2V 28 A TTL D/A 28A - Q DACOUT OSCILLATOR GND CONVERTER CLK (DAC) Q D CLR 4.5V 4.5V FB COMP VID3 VID2 VID1 VID0 VID25 VTTPG FAULT/RT SS13 SS24 FIGURE 1. + - > + -