Texas Instruments TPS2151 Manuale utente

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 

March 2002 PMP Portable Power

User’s Guide

SLVU067

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,

enhancements, improvements, and other changes to its products and services at any time and to discontinue

any product or service without notice. Customers should obtain the latest relevant information before placing

orders and should verify that such information is current and complete. All products are sold subject to TI’s terms

and conditions of sale supplied at the time of order acknowledgment.

TI warrants performance of its hardware products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI

deems necessary to support this warranty. Except where mandated by government requirements, testing of all

parameters of each product is not necessarily performed.

TI assumes no liability for applications assistance or customer product design. Customers are responsible for

their products and applications using TI components. To minimize the risks associated with customer products

and applications, customers should provide adequate design and operating safeguards.

TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,

in which TI products or services are used. Information published by TI regarding third–party products or services

does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.

Use of such information may require a license from a third party under the patents or other intellectual property

of the third party, or a license from TI under the patents or other intellectual property of TI.

Reproduction of information in TI data books or data sheets is permissible only if reproduction is without

alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction

of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for

such altered documentation.

Resale of TI products or services with statements different from or beyond the parameters stated by TI for that

product or service voids all express and any implied warranties for the associated TI product or service and

is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

EVM IMPORTANT NOTICE

Texas Instruments (TI) provides the enclosed product(s) under the following conditions:

This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION

PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided

may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective

considerations, including product safety measures typically found in the end product incorporating the goods.

As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic

compatibility and therefore may not meet the technical requirements of the directive.

Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned

within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE

WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED,

IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY

PARTICULAR PURPOSE.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user

indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products

received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction

of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic

discharge.

EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE

TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not

exclusive.

TI assumes no liability for applications assistance, customer product design, software performance, or

infringement of patents or services described herein.

Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM

User’s Guide prior to handling the product. This notice contains important safety information about temperatures

and voltages. For further safety concerns, please contact the TI application engineer.

Persons handling the product must have electronics training and observe good laboratory practice standards.

No license is granted under any patent right or other intellectual property right of TI covering or relating to any

machine, process, or combination in which such TI products or services might be or are used.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

EVM WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the specified input and output ranges described in

the EVM User’s Guide.

Exceeding the specified input range may cause unexpected operation and/or irreversible

damage to the EVM. If there are questions concerning the input range, please contact a TI

field representative prior to connecting the input power.

Applying loads outside of the specified output range may result in unintended operation and/or

possible permanent damage to the EVM. Please consult the EVM User’s Guide prior to

connecting any load to the EVM output. If there is uncertainty as to the load specification,

please contact a TI field representative.

During normal operation, some circuit components may have case temperatures greater than

60°C. The EVM is designed to operate properly with certain components above 60°C as long

as the input and output ranges are maintained. These components include but are not limited

to linear regulators, switching transistors, pass transistors, and current sense resistors. These

types of devices can be identified using the EVM schematic located in the EVM User’s Guide.

When placing measurement probes near these devices during operation, please be aware

that these devices may be very warm to the touch.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

How to Use This Manual

Preface

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About This Manual

The TPS2151 is one of the four devices in the USB peripheral power

management family TPS2140/41/50/51, which integrates both an adjustable

linear low-drop voltage regulator (LDO) and a dual-current-limited power

switch. The dual-current-limit power switch is designed to eliminate inrush

current during power on.

The evaluation module (EVM) can help designers to evaluate the device with

several different configurations by manipulating only a couple of onboard

mechanical slide switches and a few jumpers.

Users need at least one dc voltage supply and a multimeter or oscilloscope to

evaluate the operation of the EVM.

How to Use This Manual

This document contains the following chapters:

-Chapter 1—Introduction

-Chapter 2—Schematic, Bill of Materials, Layout, and Setup

-Chapter 3—Changeable Components and Test Points

Information About Cautions and Warnings

This book may contain cautions and warnings.

This is an example of a caution statement.

A caution statement describes a situation that could potentially

damage your software or equipment.

This is an example of a warning statement.

A warning statement describes a situation that could potentially

cause harm to you.

The information in a caution or a warning is provided for your protection.

Please read each caution and warning carefully.

Contents

vii

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1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Schematic, Bill of Materials, Layout, and Setup 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 Schematic of the EVM 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Bill of Materials 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Layout of the EVM 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4 Setup of the EVM 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Changeable Components and Test Points 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .



2–1 Schematic of the TPS2151 Evaluation Module (EVM) 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–2 Top Layer of the EVM and Placement of the Components 2-5. . . . . . . . . . . . . . . . . . . . . . . . . .



2–1 Bill of Materials of the TPS2151 EVM (SLVP202) 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1 Test Points and Test Signals 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

Introduction

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Each device in TPS2140/41/50/51 family integrates a dual-current-limiting

power switch and an adjustable low dropout regulator (LDO). Both the switch

and LDO limit inrush current by controlling the turnon slew rate and are

compatible with USB 1.0 and 2.0 Specifications.

The power switch has a unique dual-current-limiting function that limits the

current delivered to its load to less than 100 mA during power on. This feature

allows the load to utilize high-value capacitance at the output of the switch,

while keeping the inrush current low. When the output voltage from the switch

reaches about 93% of the input voltage, the switch power good output goes

high, and the switch current limit increases to 800 mA (minimum), at which

point higher current loads can be turned on. Therefore the load, other than

capacitance, on the switch output must not exceed the lower current limit (50

mA minimum) before the power good output rises to high.

Designers may activate the load by using either the power good signal or

another logic signal. The higher current limit provides short circuit protection

while allowing the load to draw maximum current from the source.

The switch and LDO function independently provides flexibility in many

applications requiring separate core and I/O voltages.

TPS2151 has a 5-V switch and an active high /SW_EN that distinguishes itself

from the other three parts (TPS2140, TPS2141, and TPS2150). For a detailed

description of functions and characteristics of the TPS2140/41/50/51, refer to

the data sheet (literature number SLVS399). You may check the data sheet

and ordering information on the Web site:

http://focus.ti.com/docs/prod/productfolder.jhtml?genericPartNumber=

TPS2151

To assist designers in the evaluation of the device, an evaluation module

(SLVP202) is offered based on TPS2151. The EVM requires 5-V supplies for

both the power switch and the LDO. The LDO output voltage is set to 3.3 V by

an external resistor divider. Two slide switches and few jumpers on the EVM

are provided to change the connections between the LDO and the power

switch, so several different application configurations can be evaluated.

The required external parts for the EVM are two input capacitors (on SW_IN

and LDO_IN), three output capacitors (on SW_OUT and LDO_OUT), and a

resistor divider (two resistors). All of these components are placed inside a

white-rectangle box on the EVM.

Chapter 1

2-1

Schematic, Bill of Materials, Layout, and Setup

      

This chapter contains schematics, bill of materials, board layout, and setup of

EVM.

Topic Page

2.1 Schematic of the EVM 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Bill of Materials 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Layout of the EVM 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4 Setup of the EVM 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 2

Schematic of the EVM

2-2

2.1 Schematic of the EVM

Figure 2–1 shows the schematic of the EVM.

Figure 2–1.Schematic of the TPS2151 Evaluation Module (EVM)

Indice

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