ISL6532AEVAL1 Intersil, ISL6532AEVAL1 Datasheet

ISL6532AEVAL1

Manufacturer Part Number

ISL6532AEVAL1

Description

EVALUATION BOARD 1 ISL6532A

Manufacturer

Intersil

Datasheets

1.ISL6532ACRZ.pdf (17 pages)

2.ISL6532AEVAL1.pdf (9 pages)

Specifications of ISL6532AEVAL1

Main Purpose

Special Purpose DC/DC, DDR Memory Supply

Outputs And Type

3, Non-Isolated

Voltage - Output

1.25V, 1.5V, 2.5V

Voltage - Input

5V, 12V

Regulator Topology

Buck

Frequency - Switching

250kHz

Board Type

Fully Populated

Utilized Ic / Part

ISL6532A

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Current - Output

Power - Output

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Introduction

The ISL6532A provides a complete ACPI compliant power

solution for dual channel DDRI and DDRII Memory systems.

Included are both a synchronous buck controller and

integrated LDO to supply VDDQ with high current during

S0/S1 (Run) states and standby current during S3 (Suspend-

To-RAM = STR) state. During Run mode, a fully integrated

sink-source regulator generates an accurate (VDDQ/2) high

current VTT voltage. A buffered version of the VDDQ/2

reference is provided as V

VDDQ overcurrent protection and an internal LDO controller

for production of 1.5V Video and Core Voltages.

The ISL6532A contains high performance error amplifiers, a

high accuracy reference, an internal 50% tracking reference,

a fixed 250kHz internal oscillator, overcurrent protection for

the VDDQ regulator utilizing the control MOSFET r

and Power Good indication. All these features are packaged

in a 28-Lead 6x6mm QFN. A more complete description of

the IC can be found in the datasheet[1].

Reference Design

The ISL6532AEVAL1 is an evaluation board that highlights the

operation of the ISL6532A in an embedded DDR DRAM

Memory Power application. The V

designed to supply 2.5V at a maximum load of 20A. The V

termination supply will track the V

sourcing or sinking current. The LDO is designed to supply 1.5V

AGP core voltage. The schematic, Bill of Materials, and Board

Layout for the ISL6532AEVAL1 can be found in the Appendix.

Quick Start Evaluation

The ISL6532AEVAL1 board is shipped ‘ready to use’ right

from the box. The ISL6532AEVAL1 supports testing with

standard laboratory equipment or with an ATX power supply.

All three outputs can be exercised through external loads.

Both the V

or sink current while the AGP Linear regulator may only

source current.

There are auxiliary posts available on the board for

introducing power to the board if an ATX supply is not

available. If an ATX supply is used, these posts may be used

to monitor the voltages supplied by the ATX supply. There

are also posts available on each regulated output rail for

drawing a load and/or monitoring the voltages. Ten

individually labeled probe points are also available for use.

These probe points provide Kelvin connections to signals

which may be of interest to the designer.

Three switches have been placed on the board to

accommodate ACPI signal simulation. The ATX switch will

enable or disable the ATX power supply, while the other two

switches will send S5 or S3 signals to the ISL6532A.

DDQ

and V

regulators have the ability to source

REF

. The ISL6532A also features

DDQ

Application Note

supply at 50% while

supply has been

DS(ON)

Embedded ACPI Compliant DDR Power

1-888-INTERSIL or 321-724-7143

Generation Using the ISL6532A

Recommended Test Equipment

To test the full functionality of the ISL6532A, the following

equipment is recommended:

• An ATX power supply (minimum 160W configuration)

• Three electronic loads

• Four channel oscilloscope with probes

• Precision digital multimeters

If individual power supplies are to be utilized in place of the

ATX power supply, then the 5V power supply should be

capable of producing 15A of continuous current. The supply

for the 5VSBY rail should be capable of producing up to 1A.

A single 5V supply may be used for both VCC5 and 5VSBY.

The 12V supply should be capable of producing at least 1A

of continuous current.

Power and Load Connections

Input Voltages

Simply plug the 20 pin connector from the ATX power supply

into the 20 pin receptacle, J1, on the evaluation board. If

laboratory supplies are to be used, then connect the 5V

supplies to the VCC5 and 5VSBY posts. Connect the 12V

supply to the 12V post. Connect the ground leads of all

supplies to the corresponding GND post directly to the left of

each supply post.

Loading V

Connect the positive terminal of the first electronic load to

the VDDQ post. Connect the return terminal of the same

load to the corresponding GND post.

Loading V

To test V

positive terminal of the second electronic load to the VTT

post. Connect the return terminal of the same load to the

corresponding GND post.

Loading V

To test V

positive terminal of the second electronic load to the VDDQ post.

Connect the return terminal of the same load to the VTT post.

Loading V

Connect the positive terminal of the third electronic load to

the 1.5VAGP post. Connect the return terminal of the

corresponding GND post.

Standby 3.3V Generation

The ISL6532AEVAL1 has been designed to generate a

3.3VSBY rail from the 5VSBY input. The 3.3VSBY rail is

used as the input to the standby LDO when the system is in

the Sleep State.

CAUTION: The return terminal of the load must float for

this to work properly.

November 2003

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

while the regulator sinks current, connect the

DDQ

while the regulator sources current, connect the

AGP

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

- Sourcing Current

- Sinking Current

Author: Douglas Mattingly

AN1056

Related parts for ISL6532AEVAL1

ISL6532AEVAL1 Summary of contents

Page 1

... DDQ sourcing or sinking current. The LDO is designed to supply 1.5V AGP core voltage. The schematic, Bill of Materials, and Board Layout for the ISL6532AEVAL1 can be found in the Appendix. Quick Start Evaluation The ISL6532AEVAL1 board is shipped ‘ready to use’ right from the box. The ISL6532AEVAL1 supports testing with standard laboratory equipment or with an ATX power supply ...

Page 2

... OFF Initial Power Up - Cold Start There are two ways to initiate a Cold Start on the ISL6532AEVAL1. Prior to applying power to the ATX supply, the S5 and S3 switch toggles should be pointing to “ACTIVE” while the ATX switch toggle is pointing to “OFF”. After applying power to the ATX supply, the ISL6532A can be Cold Started be engaging the ATX switch to “ ...

Page 3

Shutdown to Active State Transition Figure 4 shows the transition from Shutdown to Active. Refer to Table 1 for proper switch positions to achieve this state transition. S5 5VATX 12VATX PGOOD 10ms/DIV 5VATX @ 1V/DIV V DDQ 12VATX @ 3V/DIV ...

Page 4

... V Conclusion TT 50mV/DIV The ISL6532AEVAL1 is a versatile platform that allows designers to gain a full understanding of the functionality of the ISL6532A in a DDR Memory System. The board is also V AGP flexible enough to allow the designer to modify the board for 50mV/DIV differing requirements ...

Page 5

ISL6532EVAL1 Schematic J1 ATX SWITCH 14 PSON S3# S5 10.0kΩ PGOOD V DDQ S5# S3 REF 0.1µ 0.1µ 0.47µF V DDQ + 220µF 1.25V + C 21 ...

Page 6

... ISL6532AEVAL1 Bill of Material REF DES DESCRIPTION C4, 5, 16-18 1µF, X5R Capacitor C1 2200µF 6.3V MBZ Capacitor C6 1800µF 16V MBZ Capacitor C20, 21, 23 220µF, 25V C9-12 22µF Capacitor C13 56nF Capacitor C14 6.8nF Capacitor C15, 22 1000pF Capacitor C19 0.047µF, 10V, X5R MLC Capacitor ...

Page 7

SL6532AEVAL1 Layout (Continued) 7 Application Note 1056 FIGURE 13. TOP FIGURE 14. INTERNAL 1 GROUND ...

Page 8

SL6532AEVAL1 Layout (Continued) 8 Application Note 1056 FIGURE 15. INTERNAL 2 POWER FIGURE 16. BOTTOM ...

Page 9

... 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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