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Part: ISL6523
Category:
Power Management
-> Desktop
Description: VRM8.5 Dual PWM And Dual Linear Power System Controller
Company: Intersil Corporation
Datasheet: Download ISL6523 datasheet File size : 402 kB
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Datasheet text preview:
ISL6523
TM
D a t a Sheet
J an ua ry 2002
F N90 24. 1
VRM8.5 Dual PWM and Dual Linear Power System Controller
The ISL6523 provides the power control and protection for four output voltages in high-performance microprocessor and computer applications. The 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 AGTL+ 1.2V bus power with a standard buck converter. The linear controllers regulate power for the 1.5V AGP bus and the 1.8V power for the chipset core voltage and/or cache memory circuits. The ISL6523 includes an Intel VRM8.5 compatible, TTL 5input 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 second PWM controller's output provides a voltage level of 1.2V with ±3% accuracy. The linear regulators use external N-channel MOSFETs or bipolar NPN pass transistors to provide fixed output voltages of 1.5V ±3% (VOU T3) and 1.8V ±3% (VO UT4). The ISL6523 monitors all the output voltages. A delayedrising VTT (standard buck 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 controllers' 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 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 - All Other Outputs . . . . . . . . . . . . . ±3% Over Temperature · VRM 8.5 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 Monitors - Switching Regulators Do Not Require Extra Current Sensing Elements, Use MOSFET's rD S(ON ) · Small Converter Size - Constant Frequency Operation - 200kHz Internal Oscillator
Applications
· M otherboard Power Regulation for Computers
Pinout
ISL6523 (SOIC) TOP VIEW
UGATE2 1 PHASE2 2 2 8 VCC 2 7 UGATE1 2 6 PHASE1 2 5 LGATE1 2 4 PGND 2 3 OCSET1 2 2 VSEN1 2 1 F B1 2 0 COMP1 1 9 VSEN3 1 8 DRIVE3 1 7 GND 1 6 VAUX 1 5 DRIVE4
Ordering Information
PART NUMBER ISL6523CB ISL6523EVAL1 TEMP. RANGE ( oC) 0 to 70 PACKAGE 28 Ld SOIC PKG. NO. M28.3
VID3 3 VID2 4 VID1 5 VID0 6 VID25 7 PGOOD 8 VTTPG 9 OCSET2 10 VSEN2 11 SS24 12 SS13 13 VSEN4 14
Evaluation Board
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2002. All Rights Reserved
VSEN3 +
OCSET2
VSEN1
OCSET1
VCC
VAUX 1.5V EA3 DRIVE3 +
-
-
POWER-ON
x 0.75
+
x 1.1 0
-
UV3 + 200µA
RESET (POR)
VAU X
PWM2
VSEN2
+ E A2 VCC UV2 +
x 0.9 0
+ 1 .2V SET Q CL K Q D CLR > OSCILLATOR 28µA 2 8µA DACO UT TTL D/A CONVERTER ( DAC)
VTTPG
+
-
+
-
2
DRIVE4 +
x0 .75
-
+
UV4
-
-
E A4 + VSEN4 VCC UGATE2 PHASE2 INHIBIT GATE CONTROL PWM COMP2 OV SOFTSTART & FAULT LOGIC FAULT DRIVE2
x 0 .9 0
+
-
-
1 .8V
2 00µA + +
PGOOD
-
OC2
x 1 .1 5
-
ISL6523
V CC DRIVE1 UGATE1 O C1 +
-
PHASE1
-
+ E A1
GATE CONTROL PWM COMP1 PWM1 V CC LGATE1 SYN CH DRIV E PGND GND
-
4.5 V
4.5V
SS13
SS24
F B1
COMP1
VID3 VID2 VID1 VID0 VID2 5
FIGU RE 1. BLOCK DIAGRAM
ISL6523
+5VIN Q1 PWM2 CONTROLLER VOUT1 PWM1 CONTROLLER Q2
Q3 VOUT2
ISL6523
+3.3VIN Q4 LINEAR CONTROLLER LINEAR CONTROLLER
V O U T3
Q5 VOUT4
FIGURE 2. SIMPLIFIED POWER SYSTEM DIAGRAM
+12VIN +5VIN LI N CIN VCC OCSET1 PGOOD POWERGOOD
OCSET2
Q3 VOUT2 1.2V COUT2 CR2 LOUT2
UGATE2 PHASE2
UGATE1 PHASE1
Q1 L O U T1 V O U T1 1 .3V to 3.5V
LGATE1 VSEN2 PGN D VSEN1 VTT POWERGOOD VTTPG
Q2
COUT1
ISL6523
+3. 3VIN Q4 VOUT3 1 .5V COUT3 DRIVE4 VSEN4 VAUX
FB1 COMP1
DRIVE3 VSEN3 VID3 VID2 VID1 VID0 VID2 5 SS13
Q5 VOUT4 1.8V COUT4 C SS24
SS24 CSS13 G ND
FIGURE 3. TYPICAL APPLICATION
3
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