ISL6559EVAL1 Intersil, ISL6559EVAL1 Datasheet

ISL6559EVAL1

Manufacturer Part Number

ISL6559EVAL1

Description

EVALUATION BOARD ISL6559

Manufacturer

Intersil

Datasheets

1.ISL6559CBZ-T.pdf (21 pages)

2.ISL6559EVAL1.pdf (11 pages)

Specifications of ISL6559EVAL1

Main Purpose

Special Purpose DC/DC, VRM Supply

Outputs And Type

1, Non-Isolated

Power - Output

125W

Voltage - Output

1.25V

Current - Output

100A

Voltage - Input

5V, 12V

Regulator Topology

Buck

Frequency - Switching

600kHz

Board Type

Fully Populated

Utilized Ic / Part

ISL6559, ISL6605

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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Introduction

The AMD Hammer family microprocessors feature higher

clock speeds and greater device density than previous

product families. The power management solution for this

next generation family of microprocessors must contend with

lower core voltages, tighter transient specifications, and

higher peak current demands. Responding to the changing

power management needs of its customers, Intersil

introduces the ISL6559 controller to power the AMD

Hammer family microprocessors.

Intersil ISL6559 and ISL6605

The ISL6559EVAL1 is a versatile voltage regulator-module

(VRM) design. The evaluation board comes configured for

4-phase multi-phase buck operation, designed to meet AMD

Hammer Family Desktop Processor specifications. The

board can easily be modified to support evaluation at lower

current specifications. The ISL6559 controller functions are

specifically designed to compliment and support the

Hammer Family feature set with ISL6605 drivers. The

chipset forms a highly integrated solution for AMD Hammer

processor applications.

The ISL6559 regulates output voltage and balances load

currents for two to four synchronous buck converter

channels. The controller features a 5-bit DAC, which

provides a digital interface for accurate voltage programming

over the entire Hammer Family range of 0.800V to 1.550V.

New multi-phase family features include differential remote

output voltage sensing, to improve regulation tolerance;

pin-adjustable reference offset, for ease of implementation;

VID-on-the-Fly, to respond to DAC changes during

operation; and optional load line regulation. For a more

detailed description of the ISL6559 functionality, refer to the

data sheet [1].

The ISL6605 driver is chosen to drive two N-Channel power

MOSFETs in a synchronous-rectified buck converter

channel. Each channel has a single logic input that controls

the upper and lower MOSFETs. Dead time is optimized on

both switching edges to provide shoot-thru protection.

Internal bootstrap circuitry only requires an external

capacitor and provides better enhancement of the upper

MOSFET. For a more detailed description of the ISL6605,

refer to the data sheet [2].

The Intersil multi-phase family controller and driver portfolio

continues to expand with new selections to better fit our

customer’s needs. Refer to our website for updated

information, www.intersil.com.

Application Note

Solution for AMD Hammer Family Processors

ISL6559EVAL1: Voltage Regulator Module

1-888-INTERSIL or 321-724-7143

ISL6559 VRM Reference Design

The evaluation kit consists of the ISL6559EVAL1 board,

associated data sheets on the ISL6559 controller and

ISL6605 driver, as well as this application note. The

evaluation kit also includes the Elcon VRM test board which

has an edged connector for the VRM to plug into. The

evaluation kit provides convenient test points, a banana jack

for power supply connectors, and an on-board transient load

generator to facilitate the evaluation process. The

ISL6559EVAL1 board and test board is configured to run off

of a single 12V supply.

The evaluation board meets the output voltage and current

specifications, shown in Table 1, with the VID DIP switch (set

to 01100 (1.250V). The 1U VRM board is fabricated using 6

layers with 3oz copper on outer and 4oz copper on inner

layers. The test board is implemented in 4-layer, 2oz copper.

Layout plots and part lists are provided at the end of the

application note for this design.

Quick Start Evaluation

Circuit Setup

The ISL6559EVAL1 board will arrive with the VID DIP switch

(U2) set to 01100 (1.250V). If another output voltage level is

desired, refer to the ISL6559 data sheet for the complete

DAC table and change the VID switches accordingly. Note

that changing the U2 VID states will change the dynamics of

the load generator.

Input Power Connections

A single power supply connection is provided on the VRM

test board. Insure connection is secure.

Two female banana jacks are provided for connection of the

bench top power supply. Connect the +12V terminal to J5,

and the common ground to terminal J6.

Static Regulation

Transient Regulation

Continuous Load Current

Load Current Step

Load Current Transient

TABLE 1. 4-PHASE VRM DESIGN PARAMETERS

PARAMETER

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

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

June 2004

Author: Thomas Victorin

1.109V

MIN

~560A/µs

1.250V

AN1132

100A

MAX

Related parts for ISL6559EVAL1

ISL6559EVAL1 Summary of contents

Page 1

... Quick Start Evaluation Circuit Setup The ISL6559EVAL1 board will arrive with the VID DIP switch (U2) set to 01100 (1.250V). If another output voltage level is desired, refer to the ISL6559 data sheet for the complete DAC table and change the VID switches accordingly. Note that changing the U2 VID states will change the dynamics of the load generator ...

Page 2

... Power Output Connections The ISL6559EVAL1 output can be exercised using either resistive or electronic loads. Copper alloy terminal lugs provide connection points for loading. Tie the positive load connection to VCORE, terminal J2 or J3, and the negative to ground, terminal J4 and J10. A shielded scope probe test point, J8, allows for inspection of the output voltage, VCORE ...

Page 3

... Application Note 1132 current of the converter and effectively creates an output voltage droop; the output impedance is 0.91mΩ. The rising edge transient response of the ISL6559EVAL1 to the aforementioned maximum load conditions is shown in Figure 3. A bench-top electronic load draws 0A continuously from the converter, while the on-board load generator provides a ~100A load step ...

Page 4

Overcurrent Protection The ISL6559 monitors the output current level by averaging the sampled current from each ISEN pin. The R resistors (R1, R2, R3, R4) are selected such that the current sourced by the ISEN pins is 50µA at maximum ...

Page 5

... FIGURE 7. VID-ON-THE-FLY TRANSITION FROM 1.30V TO 1.55V Efficiency The efficiency of the ISL6559EVAL1 board, loaded up to 100A is plotted in Figure 8. Measurements were performed at room temperature and taken at thermal equilibrium with 400 LFM of air and heatsink. The design exceeds the AMD Hammer Desktop minimum requirements of 50% efficiency under minimum loading and 80% efficiency at maximum loading ...

Page 6

Schematic ...

Page 7

... ISL6559EVAL1 Layout 7 Application Note 1132 FIGURE 9. TOP FIGURE 10. BOTTOM ...

Page 8

VRM Test Board Schematic ...

Page 9

VRM Test Board Schematic ...

Page 10

... J.W. Miller 10% @ 2.52MHz Diode-Rectifier, TH, TO220, 2PIN, Motorola 45V, 7.5A IC-2-4 Phase Buck Controller, 32P, Intersil MLFP, 5X5 IC-P6 HV Synch Buck MOSFET, 8P, Intersil QFN, 3X3 IC-Switching Regulator, 6P, SOT23, Linear Technology 0.6A, 1.4 IC-Temp.Switch, 5P, SOT23, 2.7- Maxim 5.5V IC-Non-Inverting Buffer, 5P, S0T23-5 On Semiconductor Transis-PwrMOS, N-Channel, SMD, ...

Page 11

... Heatsink 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 the Application Note or Technical Brief is current before proceeding. For information regarding Intersil Corporation and its products, see www.intersil.com ...

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