ISL6521EVAL1【PDF 1/8 页】EVALUATION BOARD 1 ISL6521

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Power Management Controller For Mixed-Voltage

FPGA Based Systems

Application Note

July 10, 2006

AN1247.0

Author: Ross O. Staffhorst

Introduction

Field Programmable Gate Arrays (FPGAs) are providing a

path for rapid prototyping and implementation of digital

systems. The classes of programmable logic devices vary

based on memory utilization and configuration. Power

management systems designed to support them must

stand-up to potential programming enhancements which

boost their power requirements. Responding to the changing

needs of the industry, Intersil introduces the ISL6521

controller to power mixed-voltage FPGAs.

The versatility of the ISL6521 lends well to powering most

any embedded processor or logic device which require a

regulated high current, low voltage supply and up to three

independent, lower current supplies.

Intersil ISL6521

The ISL6521 regulates four output voltages and provides

simple protection functions. The PWM controller drives two

The ISL6521 features overcurrent protection of the switching

converter and simple undervoltage protection of the linear

controllers. For a more detailed description of the ISL6521

functionality, refer to the ISL6521 Data Sheet [1].

The ISL6521EVAL1 Reference Design

The ISL6521EVAL1 evaluation board is intended to provide

a versatile platform for evaluation of surface mount and thru

hole components. The evaluation board is designed to meet

the output voltage and current specifications shown in

Table 1. The synchronous buck converter can sustain 5A of

continuous load current and handle 5A step, 2.5A/ μ s load

current transients. Two linear regulators are designed to

supply 1A of continuous load current with the third linear

regulator providing 100mA with no external pass device. The

board is implemented on a 1-ounce, 2-layer, printed circuit

board. See pages 5-8 for schematic, bill of materials, and

layout plots.

TABLE 1. ISL6521EVAL1 DESIGN PARAMETERS

external N-Channel MOSFETs in a synchronous buck

converter topology. This output is intended to power the

internal core logic (V CCINT ). The integrated linear controllers

can drive up to 120mA directly, or up to 3A with an external

NPN pass transistor. The linear controllers typically power

the I/O bank (V CCO ), input buffer reference voltage (V REF ),

and the auxiliary logic (V CCAUX ). The power management

block diagram for an FPGA is shown in Figure 1. Integrated

high-bandwidth error amplifiers and an accurate internal

voltage reference insure a ±2% static voltage regulation

tolerance over line, load and temperature ranges.

PARAMETER

Buck Regulator:

Static Regulation VOUT1

Continuous Load Current

Load-Current Transient

Linear Regulators:

Static Regulation VOUT2

Continuous Load Current

Static Regulation VOUT3

Continuous Load Current

MAX

1.530V

2.5A/ μ s

3.366V

2.550V

MIN

1.470V

3.234V

2.450V

PWM

Controller

V CCINT

Core Logic

Static Regulation VOUT4

Continuous Load Current

1.836V

120mA

1.764V

100mA

Linear

V CCO

I/O Logic

Quick Start Evaluation

Circuit Setup

Linear

V CCAUX

V REF

Aux Logic

Buffer

Reference

Connect a +5V bench top power supply to the +5V and GND

turrets located next to the Intersil logo, see Figure 2. Each

output has a similar pair of turrets labeled VOUTx and GND.

Each output can be exercised using either resistive or

electronic loads connected across these points. Once the

external supply and loads are connected to the board, the

+5V supply can be energized. A light emitting diode, D2,

ISL6521

FPGA

should burn red to indicate power has been applied to the

board. If D2 is not red, power-down the supply and check all

FIGURE 1. FPGA POWER MANAGEMENT BLOCK DIAGRAM

external connections.

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

1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.

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

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