ISL6524ACB-T Intersil, ISL6524ACB-T Datasheet

ISL6524ACB-T

Manufacturer Part Number

ISL6524ACB-T

Description

IC CTRLR VRM8.5 PWM TRPL 28-SOIC

Manufacturer

Intersil

Datasheet

1.ISL6524ACBZ.pdf (16 pages)

Specifications of ISL6524ACB-T

Pwm Type

Voltage Mode

Number Of Outputs

Frequency - Max

215kHz

Duty Cycle

100%

Voltage - Supply

10.8 V ~ 13.2 V

Buck

Yes

Boost

Flyback

Inverting

Doubler

Divider

Cuk

Isolated

Operating Temperature

0°C ~ 70°C

Package / Case

28-SOIC (7.5mm Width)

Frequency-max

215kHz

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Current page: 1 of 16
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VRM8.5 PWM and Triple Linear Power

System Controller

The ISL6524A 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 chipset core voltage and/or

cache memory circuits.

The ISL6524A 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%

The ISL6524A monitors all the output voltages. A delayed-

rising VTT (V

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 over-voltage protection for

the core output uses the lower MOSFET to prevent output

voltages above 115% of the DAC setting. The PWM

controllers’ over-current function monitors the output current

by using the voltage drop across the upper MOSFET’s

Ordering Information

DS(ON)

ISL6524ACB*

ISL6524ACBZ* (Note)

ISL6524ACBZA-T (Note)

ISL6524EVAL1

*Add “-T” suffix for tape and reel.

NOTE: Intersil Pb-free products employ special Pb-free material sets;

molding compounds/die attach materials and 100% matte tin plate

termination finish, which are RoHS compliant and compatible with

both SnPb and Pb-free soldering operations. Intersil Pb-free products

are MSL classified at Pb-free peak reflow temperatures that meet or

exceed the Pb-free requirements of IPC/JEDEC J STD-020.

OUT2

PART NUMBER

), 1.5V ±3% (V

, eliminating the need for a current sensing resistor.

OUT2

output) Power Good signal is issued

OUT3

Evaluation Board

RANGE

0 to 70

TEMP.

(°C)

) and 1.8V ±3% (V

28 Ld SOIC

28 Ld SOIC (Pb-free) M28.3

Data Sheet

PACKAGE

OUT4

1-888-INTERSIL or 1-888-352-6832

M28.3

DWG.

PKG.

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

Features

• Provides 4 Regulated Voltages

• Drives N-Channel MOSFETs

• Linear Regulator Drives Compatible with both MOSFET

• Simple Single-Loop Control Design

• Fast PWM Converter Transient Response

• Excellent Output Voltage Regulation

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

• Power-Good Output Voltage Monitors

• Over-Voltage and Over-Current Fault Monitors

• Small Converter Size

• Pb-Free Available (RoHS Compliant)

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 Amplifier

- Full 0% to 100% Duty Ratio

- Core PWM Output: ±1% Over Temperature

- All Other Outputs: ±3% Over Temperature

Output Voltage Selection

- Wide Range - 1.050V to 1.825V

- Separate delayed VTT Power Good

- Switching Regulator Doesn’t Require Extra Current

- Constant Frequency Operation

- 200kHz Internal Oscillator

and North/South Bridge Core

Sensing Element, Uses MOSFET’s r

All other trademarks mentioned are the property of their respective owners.

April 8, 2005

FAULT/RT

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

PGOOD

DRIVE2

VTTPG

VSEN2

VSEN4

VID25

SS24

SS13

VID3

VID2

VID1

VID0

FIX

ISL6524A (SOIC) TOP VIEW

ISL6524A

DS(ON)

VCC

UGATE

PHASE

LGATE

PGND

OCSET

VSEN1

COMP

VSEN3

DRIVE3

GND

VAUX

DRIVE4

FN9064.1

Related parts for ISL6524ACB-T

ISL6524ACB-T Summary of contents

Page 1

... PACKAGE ISL6524ACB SOIC ISL6524ACBZ* (Note SOIC (Pb-free) M28.3 ISL6524ACBZA-T (Note SOIC (Pb-free) M28.3 ISL6524EVAL1 Evaluation Board *Add “-T” suffix for tape and reel. NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations ...

Page 2

VSEN3 1.5V or 1.26V VAUX EA3 - DRIVE3 + x0.75 x0.75 + DRIVE4 - EA4 + 1.8V or 1.26V VSEN4 - FIX INHIBIT DRIVE2 VSEN2 - + EA2 UV2 - + x0.90 + SET 1. OSCILLATOR CLK > ...

Page 3

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

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 PWM CONTROLLERS GATE DRIVERS UGATE Source UGATE Sink LGATE Source LGATE Sink PROTECTION VSEN1 Over-Voltage (VSEN1/DACOUT) FAULT Sourcing Current OCSET Current Source Soft-Start ...

Page 6

Functional Pin Descriptions VCC (Pin 28) Provide a 12V bias supply for the IC to this pin. This pin also provides the gate bias charge for all the MOSFETs controlled by the IC. The voltage at this pin is monitored ...

Page 7

This way, the output voltage of the two regulators can be adjusted from 1.26V up to the input voltage (+3.3V or +5V; VOUT4 can only be set from 1.7V up) by way of an external resistor divider connected at the ...

Page 8

ATX 12V 10V VTTPG SS13 ATX 5V SS24 PGOOD 0V 3.0V ATX 3.3V V (1.8V) OUT4 V (1.5V) OUT3 TIME FIGURE 6. SOFT-START INTERVAL The time interval is dependent upon ...

Page 9

OC1 comparator trips when the voltage across exceeds the level programmed by R DS(ON) inhibits outputs 1, 2, and 3, discharges the soft-start capacitor C with 28µA current sink, ...

Page 10

TABLE 1. OUT1 OUTPUT VOLTAGE PROGRAM PIN NAME VID3 VID2 VID1 VID0 ...

Page 11

Dedicate another solid layer as a power plane and break this plane into smaller islands of common voltage levels. The power plane should support the input power and output power nodes. Use ...

Page 12

Compensation Break Frequency Equations 1 ----------------------------------- × × 2π ------------------------------------------------------ - × × 2π Figure 12 shows an ...

Page 13

During this interval the difference between the inductor current and the transient current level must be supplied by the output capacitor(s). Minimizing the ...

Page 14

OR LESS +12V VCC ISL6524A Q1 UGATE PHASE LGATE PGND GND FIGURE 13. UPPER GATE DRIVE - DIRECT V 14 Linear Controllers Transistor Selection The ISL6524A linear controllers are compatible with both NPN bipolar as well ...

Page 15

... OUT4 +1.8V + C20 560µF 15 and +12VDC. For detailed information on the circuit, including a Bill-of-Materials and circuit board description, see ), the GTL Application Note AN9925. Also see the Intersil web site at OUT1 ), and the www.intersil.com OUT3 ) from +3.3V, +5VDC, L1 1µ 680µ ...

Page 16

... 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; nor for any infringements of patents or other rights of third parties which may result from its use ...

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