HIP6021EVAL1【PDF 1/10 页】EVALUATION BOARD HIP6021

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Motherboard Power Conversion Solutions Using

the HIP6020 and HIP6021 Controller ICs

Application Note

April 1999

AN9836

Introduction

The rapidly changing desktop motherboard architecture for

core processor and Accelerated Graphics Port (AGP)

voltages demand innovative power conversion solutions.

The HIP6020 [1] and HIP6021 [2] controllers provide a

bridge over these challenging power concerns. This

document describes the HIP6020EVAL1 and

HIP6021EVAL1 reference designs, features, and usage

guidelines.

+5V

+12V

VCC_CORE

For high performance AGP systems, the HIP6020EVAL1

monitors and controls a standard buck converter to regulate

the 1.5V or 3.3V Universal AGP Card bus voltage

(VCC_VDDQ). While the HIP6021EVAL1 addresses the

lower performance AGP systems with a third integrated

adjustable linear controller to regulate the 1.5V or 3.3V AGP

core voltage.

FROM ATX

SUPPLY

EMT TOOL

ADJUSTABLE

SYNCHRONOUS BUCK

CONTROLLER

DAC

VID0

SLOT 1

VCC_VDDQ

VID1

VID2

VID3

VID4

HIP6020/21EVAL1

FIGURE 2. QUICK START EVALUATION CONNECTIONS

+3.3V

ADJUSTABLE

STANDARD BUCK

CONTROLLER

ADJUSTABLE

LINEAR

CONTROLLER

ADJUSTABLE

LINEAR

CONTROLLER

THIS BLOCK

INCLUDED IN

HIP6020 ONLY

THIS BLOCK

INCLUDED IN

HIP6021 ONLY

The HIP6020/21 EVAL1 circuit board shows the layout and

traces of the power supply portion of a computer

motherboard. Included on the boards are the ATX input

power connector and a Pentium II, SLOT 1 connector.

Motherboard designers should reference the component

placement and printed circuit routing of the specific circuit

board. Both circuit boards contain jumpers and spare

component placeholders to facilitate detailed evaluation of

the HIP6020 or HIP6021.

VCC_VTT

VCC_MCH

ADJUSTABLE

LINEAR

CONTROLLER

Quick Start Evaluation

Both evaluation platforms support testing with standard

power supplies or an ATX-style power supply. Simply

connect the ATX supply to J2 connector, see Figure 2, or

connect standard laboratory supplies to the related posts

FIGURE 1. HIP6020/21EVAL1 BLOCK DIAGRAM

Figure 1 presents a simple block diagram of the HIP6020/21

application circuit. The +3.3V, +5V, and +12V power inputs

are provided by an ATX power supply. The HIP6020 [1] and

HIP6021 [2] both monitor and regulate four output voltages.

Both provide a synchronous-rectified buck converter

controller which regulates the microprocessor core voltage

(VCC_CORE) to a level programmed by a 5-bit digital code.

As well as, two adjustable linear controllers which drive

external MOSFETs to supply the 1.5V GTL bus voltage

(VCC_VTT) and 1.8V North/South Bridge core voltage

(VCC_MCH) and/or cache memory. The linear regulators

use the 3.3V from the ATX for their input voltage to minimize

the power dissipated.

marked +12VIN, +5VIN, +3.3VIN and GND. No power-up

sequence is required when using standard laboratory power

supplies.

The outputs can be exercised using either resistive loads,

electronic loads, or the Intel Slot 1 EMT tool. Shielded scope

probe test points (TP2, TP5, TP6 and TP8) on the outputs

(VCC_VDDQ, VCC_CORE, VCC_VTT and VCC_MCH)

allow for accurate inspection of the output power quality.

Before proceeding, please consult Table 1 for the evaluation

board’s design envelope characteristics.

1-888-INTERSIL or 1-888-468-3774 | Copyright ? Intersil Corporation 1999

Pentium? is a registered trademark of Intel Corporation.

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