ISL6553EVAL1 Intersil, ISL6553EVAL1 Datasheet

ISL6553EVAL1

Manufacturer Part Number

ISL6553EVAL1

Description

EVALUATION BOARD ISL6553

Manufacturer

Intersil

Series

Endura™r

Datasheets

1.ISL6553CBZ.pdf (15 pages)

2.ISL6553EVAL1.pdf (9 pages)

Specifications of ISL6553EVAL1

Main Purpose

Special Purpose DC/DC, VRM Supply

Outputs And Type

1, Non-Isolated

Power - Output

45W

Voltage - Output

1.5V

Current - Output

30A

Voltage - Input

5V, 12V

Regulator Topology

Buck

Frequency - Switching

350kHz

Board Type

Fully Populated

Utilized Ic / Part

HIP6601, ISL6553

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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Introduction

draw higher peak currents while demanding faster slew

rates. Intersil’s Endura™ multiphase product family provides

a wide variety of controllers and drivers to address these

changing requirements.

Intersil ISL6553 and HIP6601A

The ISL6553 controller coupled with two HIP6601A single

channel drivers form a highly integrated solution for high

current, high slew rate applications. This controller is

recommended specifically for VRM8.5-compliant Pentium

processor core-voltage regulation.

The ISL6553 regulates the output voltage and balances load

currents for two synchronous rectified buck converter

channels. A five-bit DAC provides a digital interface to

program the 1% accurate reference over a range of 1.050V

to 1.825V. Overvoltage and overcurrent protection monitors

ensure a microprocessor safe environment. For a more

detailed description of the ISL6553 functionality, refer to the

ISL6553 Data Sheet [1].

The HIP6601A is a dual MOSFET driver specifically

designed to drive two N-Channel Power MOSFETs in a

synchronous-rectified bridge configuration. A single logic

signal input controls both the upper and lower MOSFETs.

Shoot-through protection is provided on both switching

edges to provide optimal dead time. Internal bootstrap

circuitry only requires an external capacitor and provides

better enhancement of the upper MOSFET. For a more

detailed description of the HIP6601A, refer to the HIP6601A

data sheet [2]. The HIP6602A dual-channel driver provides

equivalent functionality with some space savings [3].

ISL6553EVAL1 Reference Design

The ISL6553EVAL1 evaluation board is designed to meet the

high end requirements of Intel Celeron processors covered by

the VRM8.5 specification. The entire circuit fits within the

slightly less than 5 in

of the board. The components outside the box simplify the

evaluation process. These include input and output power

connectors, VID selection jumpers, critical probe points,

power-good indicator and a load transient generator. The

evaluation board is implemented on a two-ounce, four-layer,

printed circuit board. See pp. 7–9 for layout plots.

With the VID jumpers set to 10110 (1.5V), the evaluation

board meets the design specifications indicated in Table 1.

white outline rectangle on the top side

Power supply designers are

continually faced with next

generation microprocessors which

Application Note

for Intel

ISL6553EVAL1 - Two-Phase Power Conversion

VRM8.5-Compliant Celeron™ Motherboards

1-888-INTERSIL or 321-724-7143

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

Quick Start Evaluation

Output Voltage Selection

The ISL6553EVAL1 will arrive with the VID jumper

combination (JP1) set to 1.5V (10110). This can easily be

changed to the desired output voltage by changing the VID

jumpers per the DAC table in the ISL6553 data sheet [1].

VID0 and VID4 on the board correspond to VID25mV and

VID3 respectively. The output voltage of the ISL6553 can be

set from 1.05V to 1.825V in steps of 25mV.

Input Power Connections

The ISL6553EVAL1 provides two options for powering the

evaluation board. A 20-pin header, J1, is provided to mate

with a standard ATX supply main power connector. If an

ATX is not available, bench supplies can be connected to

female banana jacks. Connect 12V and 5V supplies to J2

and J3 respectively. Connect the grounds from both supplies

to J4. Using bench-top supplies allows easy evaluation of

power-on levels and power sequencing issues.

Power Supply Considerations

When using bench-top supplies the sequencing of the

supplies is important. Applying the 5V supply prior to the 12V

supply is not desirable. This sequencing could result in the

ISL6553 starting before the HIP6601A drivers are initialized.

The ISL6553 could complete its soft-start interval and produce

maximum duty cycle PWM drive signals before the drivers are

capable of switching power to the output. This can result in an

overcurrent trip due to the lack of soft-start, followed by a new

soft-start interval. This abnormal start-up sequence can be

avoided by applying the 5V supply after or at the same time as

the 12V supply. Power supply sequencing is not an issue

when using an ATX power supply.

The power-on reset function of the ISL6553 can be

inadvertently activated when operating the transient load

generator. Not all bench-top and ATX power supplies are

capable of responding to load transients, and they may

cause a momentary dip of VCC5. If low enough, this dip can

Static Regulation

Transient Regulation

Overvoltage Protection

Continuous Load Current

Load-Current Transient

Overcurrent Trip Level

TABLE 1. ISL6553EVAL1 DESIGN PARAMETERS

PARAMETER

October 2001

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

Endura™ is a trademark of Intersil Americas Inc.

210A/μs

Author: Ross O. Staffhorst

1.565V

1.590V

1.800V

MAX

30A

52A

AN9961.1

1.435V

1.410V

1.650V

MIN

36A

Related parts for ISL6553EVAL1

ISL6553EVAL1 Summary of contents

Page 1

... HIP6601A, refer to the HIP6601A data sheet [2]. The HIP6602A dual-channel driver provides equivalent functionality with some space savings [3]. ISL6553EVAL1 Reference Design The ISL6553EVAL1 evaluation board is designed to meet the high end requirements of Intel Celeron processors covered by the VRM8.5 specification. The entire circuit fits within the 2 ...

Page 2

... Soft-Start Interval Powered by a standard ATX power supply, the ISL6553 HO insures a controlled start-up of the converter. ISL6553EVAL1 start-up into a 50mΩ load is shown in Figure LO 3. The soft-start interval is triggered by the release of the FS/EN pin from ground potential. The converter output voltage, VCORE, slowly ramps up to the full load set point ...

Page 3

... After the overcurrent event is detected, the controller waits a short delay time before attempting a soft-start cycle to allow the disturbance to clear. The delay time for the ISL6553EVAL1 board is about 8ms in duration and is set by the switching frequency of the converter (2048/f during the soft-start cycle, another overcurrent trip is detected, the PWM signals are again tri-stated and PGOOD remains low ...

Page 4

... Efficiency could be improved by selecting MOSFETs with a slightly lower r Summary The ISL6553EVAL1 is an adaptable evaluation tool which showcases the performance of the ISL6553 / HIP6601A chip set. Designed to meet the performance requirements of Intel’s VRM-8.5 specification, the board allows the user the flexibility to configure the board for current as well as future microprocessor offerings ...

Page 5

Schematic 12VIN 5VIN VCC C7 0.1μF GND JP1 VID4 VID3 ISL6553 VID2 VID1 VID0 PGOOD FS/EN R3 107kΩ COMP R4 C11 TP7 20kΩ 2.2nF R7 1kΩ R8 10kΩ RED 5 Application Note AN9961 L1 1μH C6 1μF UGATE PWM1 PWM ...

Page 6

... KPA8CTP Falco TTID1305-838 Falco TTIB1506-478 Intersil HUF76139S3S Various 2N7002 Intersil HUF76129D3S Various Various Various Various Various Various Various Various Various Vishay WSL2512R100FB43 Vishay WSL2512R200FB43 Various Various C&K Components GT21MSKE Jolo SPCJ-123-01 Keystone 1514-2 Tektronics 1314353-00 Intersil HIP6601ACB Intersil ISL6553CB Intersil HIP2100IB ...

Page 7

HIP6553EVAL1 Layout 7 Application Note AN9961 FIGURE 10. TOP SILK SCREEN FIGURE 11. TOP COPPER ...

Page 8

HIP6553EVAL1 Layout (Continued) 8 Application Note AN9961 FIGURE 12. GROUND PLANE FIGURE 13. POWER PLANE ...

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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