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Part: ISL6523ACB
Category:
Power Management
-> PWM Controllers
Description: Vrm8.5 Dual PWM And Dual Linear Power System Controller
Company: Intersil Corporation
Datasheet: Download ISL6523ACB datasheet File size : 402 kB
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Datasheet text preview:
ISL6523A
TM
Da ta Sheet
F eb r ua r y 2002
F N9 0 6 3
VRM8.5 Dual PWM and Dual Linear Power System Controller
The ISL6523A 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 ISL6523A 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 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% (VOUT3) and 1.8V ±3% (VOUT4). The ISL6523A 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 · 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 Monitors - Switching Regulators Do Not Require Extra Current Sensing Elements, Use MOSFET's rDS(ON) · Small Converter Size - Constant Frequency Operation - 200kHz Internal Oscillator
Applications
· Motherboard Power Regulation for Computers
Pinout
ISL6523A (SOIC) TOP VIEW
UGATE2 1 PHASE2 2 2 8 VCC 27 UGATE1 26 PHASE1 25 LGATE1 24 PGND 23 OCSET1 22 VSEN1 21 FB1 20 COMP1 19 VSEN3 1 8 DRIVE3 17 GND 16 VAUX 1 5 DRIVE4
Ordering Information
PART NUMBER ISL6523ACB ISL6523EVAL1 TEMP. RANGE (oC) 0 to 70 P ACKAGE 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
x0. 75
+
x 1. 10
-
UV3 + 200µA
RESET (POR)
VAUX
PWM2
VSEN2
+ EA2 VCC UV2 +
x0.90
+ 1.2V SET Q CLK Q D CLR > OSCILLATOR 28µA 28µA DACOUT TTL D/A CONVERTER (DAC)
VTTPG
+
-
+
-
2
DRIVE4 +
x0.75
-
+
UV4
-
-
EA4 + VSEN4 VCC UGATE2 PHASE2 INHIBIT GATE CONT ROL PWM COMP2 OV SOFTSTART & FAULT LOGIC FAULT DRIVE2
x 0 .90
+
-
-
1.8V
200µA + + OC2
PGOOD
-
x 1. 15
-
ISL6523A
VCC DRIVE1 UGATE1 OC1 +
-
PHASE1
-
+ EA1
GATE CONT ROL PWM COMP1 PWM1 VCC LGATE1 SYNCH DRIVE PGND GND
-
4.5V
4.5V
SS13
SS24
FB1
COMP1
VID3 VID2 VID1 VID0 VID25
FIGURE 1. BLOCK DIAGRAM
ISL6523A
+5VIN Q1 PWM2 CONTROLLER V O U T1 PWM1 CONTROLLER Q2
Q3 VOUT2
ISL6523A
+3.3VIN Q4 LINEAR CONTROLLER LINEAR CONTROLLER
V O U T3
Q5 V O U T4
FIGURE 2. SIMPLIFIED POWER SYSTEM DIAGRAM
+12VIN +5VIN LIN CI N VCC OCSET1 PGOOD POWERGOOD
OCSET2
Q3 VOUT2 1.2V COUT2 CR2 LOUT2
UGATE2 PHASE2
UGATE1 PHASE1
Q1 LOUT1 VOUT1 1.3V to 3.5V
LGATE1 VSEN2 PGND VSEN1 VTT POWERGOOD VTTPG
Q2
COUT1
ISL6523A
+3.3VIN Q4 VOUT3 1.5V CO U T 3 DRIVE4 VSEN4 VAUX
F B1 COMP1
DRIVE3 VSEN3 VID3 VID2 VID1 VID0 VID25 SS13
Q5 V O U T4 1.8V CO U T 4 CS S 2 4
SS24 CS S 1 3 G ND
FIGURE 3. TYPICAL APPLICATION
3
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