ISL6523ACB Intersil Corporation, ISL6523ACB Datasheet

ISL6523ACB

Manufacturer Part Number

ISL6523ACB

Description

VRM8.5 Dual PWM and Dual Linear Power System Controller

Manufacturer

Intersil Corporation

Datasheet

1.ISL6523ACB.pdf (16 pages)

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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% (V

The ISL6523A monitors all the output voltages. A delayed-

rising 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

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 r

sensing resistor.

Ordering Information

ISL6523ACB

ISL6523EVAL1

3% (V

10% of the DAC setting and all other outputs are above

PART NUMBER

OUT4

DS(ON)

Evaluation Board

, eliminating the need for a current

RANGE (

TEMP.

0 to 70

28 Ld SOIC

Data Sheet

PACKAGE

OUT3

) and 1.8V

M28.3

PKG.

NO.

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

Features

• Provides 4 Regulated Voltages

• Drives N-Channel MOSFETs

• Linear Regulator Drives Compatible with both MOSFET

• Simple Single-Loop Control Designs

• Fast PWM Converter Transient Response

• Excellent Output Voltage Regulation

• VRM8.5 TTL-Compatible 5-Bit DAC Microprocessor Core

• Power-Good Output Voltage Monitors

• Overcurrent Fault Monitors

• Small Converter Size

Applications

• Motherboard Power Regulation for Computers

Pinout

- Microprocessor Core, AGTL+ Bus, AGP Bus Power,

and Bipolar Series Pass Transistors

- Voltage-Mode PWM Control

- High-Bandwidth Error Amplifiers

- Full 0% to 100% Duty Ratios

- Core PWM Output . . . . . . . . . . 1% Over Temperature

- All Other Outputs

Output Voltage Selection

- Wide Range . . . . . . . . . . . . . . . . . . . . 1.050V to 1.825V

- Separate delayed VTT Power Good

- Switching Regulators Do Not Require Extra Current

- Constant Frequency Operation

- 200kHz Internal Oscillator

and North/South Bridge Core

Sensing Elements, Use MOSFET’s r

February 2002

UGATE2

PHASE2

OCSET2

PGOOD

VTTPG

VSEN2

VSEN4

VID25

SS24

SS13

VID3

VID2

VID1

VID0

Intersil (and design) is a trademark of Intersil Americas Inc.

ISL6523A (SOIC)

TOP VIEW

3% Over Temperature

ISL6523A

DS(ON)

VCC

UGATE1

PHASE1

LGATE1

PGND

OCSET1

VSEN1

FB1

COMP1

VSEN3

DRIVE3

GND

VAUX

DRIVE4

FN9063

Related parts for ISL6523ACB

ISL6523ACB Summary of contents

Page 1

... MOSFET’ eliminating the need for a current DS(ON) sensing resistor. Ordering Information TEMP. o PART NUMBER RANGE ( C) PACKAGE ISL6523ACB SOIC ISL6523EVAL1 Evaluation Board 1 February 2002 Features • Provides 4 Regulated Voltages - Microprocessor Core, AGTL+ Bus, AGP Bus Power, and North/South Bridge Core • ...

Page 2

VSEN3 VAUX 1.5V EA3 - DRIVE3 + x0.75 x0.75 + DRIVE4 - EA4 + VSEN4 1.8V - VCC DRIVE2 UGATE2 + - PHASE2 INHIBIT PWM GATE COMP2 CONTROL - + PWM2 VSEN2 - + EA2 UV2 - + x0.90 + ...

Page 3

IN V OUT2 +3. OUT3 +12V IN + OUT2 V OUT2 1.2V C OUT2 CR2 VTT POWERGOOD +3. OUT3 1.5V C OUT3 Q5 V OUT4 1.8V ...

Page 4

Absolute Maximum Ratings Supply Voltage .+15V CC ...

Page 5

Electrical Specifications Recommended Operating Conditions, Unless Otherwise Noted. Refer to Figures 1, 2 and 3 (Continued) PARAMETER LGATE Source LGATE Sink PROTECTION VSEN1 Over-Voltage (VSEN1/DACOUT) OCSET1,2 Current Source Soft-Start Current POWER GOOD VSEN1 Upper Threshold (VSEN1/DACOUT) VSEN1 Under-Voltage (VSEN1/DACOUT) VSEN1 ...

Page 6

PGOOD (Pin 8) PGOOD is an open collector output used to indicate the status of the output voltages. This pin is pulled low when the synchronous regulator output is not within 10% of the DACOUT reference voltage or when any ...

Page 7

Soft-Start The 1.8V supply designed to power the chipset (OUT4), cannot lag the ATX 3.3V by more than 2V, at any time. To meet this special requirement, the linear block controlling this output operates independently of the chip’s power-on reset. ...

Page 8

SS24). Window comparators monitor the SS pins and indicate when the respective C pins are fully charged to above 4.0V (UP SS signals). An under-voltage on either linear output (VSEN3 or VSEN4) is ignored until ...

Page 9

OVERCURRENT TRIP: V > SET i r > OCSET OCSET R OCSET I OCSET 200 A VCC OVER- UGATE DRIVE CURRENT PWM GATE CONTROL FIGURE 8. OVERCURRENT DETECTION OUT1 Voltage ...

Page 10

Layout Considerations MOSFETs switch very fast and efficiently. The speed with which the current transitions from one device to another causes voltage spikes across the interconnecting impedances and parasitic circuit elements. The voltage spikes can degrade efficiency, radiate noise into ...

Page 11

OSC DRIVER PWM COMP V OSC - DRIVER + E REFERENCE ERROR AMP DETAILED COMPENSATION COMPONENTS COMP ISL6523A DACOUT FIGURE 10. VOLTAGE-MODE BUCK CONVERTER COMPENSATION DESIGN Modulator ...

Page 12

ESR - equivalent ESR of the output capacitor bank OUT BW - desired converter bandwidth (not to exceed 0.25 to 0.30 of the switching frequency) The design procedure for this output should follow the following steps: 1. Choose number and ...

Page 13

Input Capacitor Selection The important parameters for the bulk input capacitor are the voltage rating and the RMS current rating. For reliable operation, select ...

Page 14

PWM2 MOSFET and Schottky Selection The power dissipation in PWM2 converter is similar to PWM1 except that the power losses of the lower device are dissipated ...

Page 15

ISL6523A DC-DC Converter Application Circuit Figure 13 shows an application circuit of a power supply for a microprocessor computer system. The power supply provides the microprocessor core voltage (V bus voltage (V ), the GTL bus voltage (V OUT2 +5V ...

Page 16

... Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use ...

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