ISL6523EVAL1 Intersil, ISL6523EVAL1 Datasheet

ISL6523EVAL1

Manufacturer Part Number

ISL6523EVAL1

Description

EVALUATION BOARD VRM8.5 ISL6523

Manufacturer

Intersil

Datasheet

1.ISL6523CBZ.pdf (16 pages)

Specifications of ISL6523EVAL1

Main Purpose

Special Purpose DC/DC, VRM Supply

Outputs And Type

4, Non-Isolated

Voltage - Output

1.05 ~ 1.825V, 1.2V, 1.5V, 1.8V

Current - Output

14A, 4A, 1A, 1A

Voltage - Input

3.3V, 5V, 12V

Regulator Topology

Buck

Frequency - Switching

200kHz

Board Type

Fully Populated

Utilized Ic / Part

ISL6523

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Power - Output

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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 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

±3% (V

The ISL6523 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

±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 r

sensing resistor.

Ordering Information

ISL6523CB

ISL6523CBZ

(See Note)

ISL6523EVAL1

*Add “-T” suffix to part number for tape and reel packaging.

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

compounds/die attach materials and 100% matte tin plate termination finish, which

is 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-020B.

PART NUMBER

OUT4

DS(ON)

, eliminating the need for a current

Evaluation Board

RANGE (

TEMP.

0 to 70

28 Ld SOIC

(Pb-free)

Data Sheet

PACKAGE

OUT3

) and 1.8V

M28.3

DWG. #

PKG.

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

• Pb-free available

Applications

• Motherboard Power Regulation for Computers

Pinout

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

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 . . . . . . . . . . . . . ±3% Over Temperature

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

North/South Bridge Core

Sensing Elements, Use MOSFET’s r

UGATE2

PHASE2

OCSET2

PGOOD

VTTPG

VSEN2

VSEN4

July 2004

VID25

SS24

SS13

VID3

VID2

VID1

VID0

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

ISL6523 (SOIC)

TOP VIEW

DS(ON)

VCC

UGATE1

PHASE1

LGATE1

PGND

OCSET1

VSEN1

FB1

COMP1

VSEN3

DRIVE3

GND

VAUX

DRIVE4

ISL6523

FN9024.2

Related parts for ISL6523EVAL1

ISL6523EVAL1 Summary of contents

Page 1

... ISL6523CBZ SOIC (See Note) (Pb-free) ISL6523EVAL1 Evaluation Board *Add “-T” suffix to part number for tape and reel packaging. NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which is 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-020B ...

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 UGATE1,2 Sink LGATE Source LGATE Sink PROTECTION OCSET1,2 Current Source Soft-Start Current POWER GOOD VSEN1 Upper Threshold (VSEN1/DACOUT) VSEN1 Under-Voltage (VSEN1/DACOUT) VSEN1 Hysteresis ...

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

The POR function initiates soft-start operation after all supply voltages exceed their POR thresholds. 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 ...

Page 8

SS13UP UV3 OC LATCH S Q OC1 R COUNTER 4V R SS13 0.8V SS24 SS24UP POR 4V OV UV4 R OC2 LATCH FIGURE ...

Page 9

Determine I for I > I PEAK PEAK OUT(MAX) where ∆I is the output inductor ripple current. For an equation for the ripple current see the section under component guidelines titled ‘Output Inductor Selection’. OVERCURRENT TRIP: V > V ...

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

Figure 10 highlights the voltage-mode control loop for a synchronous-rectified buck converter. The output voltage ( regulated to the Reference voltage level. The OUT reference voltage level is the DAC output voltage (DACOUT) for PWM1. The error amplifier ...

Page 12

ESR of the output capacitor bank, as shown in the following equation: ESR OUT L = ------------------------------------------------ ( ) OUT MIN × π × 2 where L - minimum output inductor value at full output OUT(MIN) ...

Page 13

Minimizing the response time can minimize the output capacitance required. The response time to a transient is different for the application of load and the removal of load. The following ...

Page 14

OR LESS +12V VCC ISL6523 Q1 UGATE PHASE - LGATE Q2 + PGND GND FIGURE 12. UPPER GATE DRIVE - DIRECT V The power dissipation in PWM2 converter is similar to PWM1 except that the power losses of the ...

Page 15

... ISL6523 memory controller hub voltage (V and +12VDC. For detailed information on the circuit, including a Bill-of-Materials and circuit board description, see Application Note AN9925. Also see the Intersil web page (www.intersil.com) for the latest information. ), the AGP OUT1 ), and the OUT3 L1 1µ ...

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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