Texas Instruments TPS79301EVM Manuale utente

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June 2002 Power Management Products Low Power

User’s Guide

SLVU060A

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

ordersandshouldverifythatsuchinformationiscurrentandcomplete.AllproductsaresoldsubjecttoTI’sterms

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.

TIdoesnotwarrantorrepresentthatanylicense, eitherexpress orimplied, isgranted underanyTIpatentright,

inwhichTIproductsorservicesareused.InformationpublishedbyTIregardingthird–partyproductsorservices

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:

Thisevaluationkit being soldbyTI is intendedforuse 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.

ShouldthisevaluationkitnotmeetthespecificationsindicatedintheEVMUser’sGuide,thekitmaybe 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,ORSTATUTORY,INCLUDINGANYWARRANTY OF MERCHANTABILITY ORFITNESSFORANY

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

receivedmaynotberegulatorycompliant oragency certified (FCC,UL, CE,etc.). Dueto theopen construction

oftheproduct,itistheuser’sresponsibilitytotakeanyandallappropriateprecautionswithregardtoelectrostatic

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’sGuidepriortohandlingtheproduct.Thisnoticecontainsimportantsafetyinformationabouttemperatures

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

DYNAMIC WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the input voltage range of 2.7–5.5 V and the output

current range of 0 mA to 200 mA.

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.

Applyingloadsoutsideofthespecifiedoutputrangemayresultinunintendedoperationand/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.

Duringnormaloperation,somecircuitcomponentsmayhavecasetemperaturesgreaterthan

85°C.TheEVM isdesignedto operateproperlywith certaincomponentsabove 85°C aslong

astheinputandoutput rangesare maintained.Thesecomponentsincludebut arenot limited

tolinearregulators,switchingtransistors,passtransistors,andcurrentsenseresistors.These

typesof devicescanbeidentifiedusingtheEVM schematiclocated intheEVMUser’sGuide.

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

Read This First

Preface

About This Manual

This user’s guide describes the TPS793xxEVM LDO regulator evaluation

module (SLVP191). Each EVM package contains one SLVP191 test board,

with either a TPS79301DBV linear regulator or a TPS79328DBV linear

regulator,aswellassupportingpassivecomponents.TheSLVP191testboard

providesaconvenientmethodofevaluatingtheperformanceoftheTPS793xx

linear regulator family as well as other SOT–23 packaged linear regulators

with the same pinout.

How to Use This Manual

-Chapter 1—Introduction

-Chapter 2—EVM Test Setup

-Chapter 3—Test Results

Related Documentation From Texas Instruments

-TPS793xx data sheet (literature number SLVS348)

Running Title—Attribute Reference

vii

Contents

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

1.1 TPS793xx Family of LDO Regulators 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 EVM Design Strategy 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Schematic 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Bill of Materials 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5 Board Layout 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 EVM Test Setup 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Test Results 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figures

1–1 TPS79301 Board Schematic 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–2 TPS79328 Board Schematic 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–3 Top Layer 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–4 Bottom Layer 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–5 Assembly Drawing—Top 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1 Recommended TPS793xxEVM Test Setup 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1 Line Transient Response 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–2 Ripple Rejection 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

1–1 SLVP191 Bill of Materials 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

viii

1-1

Introduction

This user’s guide describes the TPS793xxEVM LDO regulator evaluation

module (SLVP191). Each EVM package contains one SLVP191 test board,

with either a TPS79301DBV linear regulator or a TPS79328DBV linear

regulator, as well as supporting passive components.

Topic Page

1.1 TPS793xx Family of LDO Regulators 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 EVM Design Strategy 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Schematic 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Bill of Materials 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5 Board Layout 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 1

TPS793xx Family of LDO Regulators

1-2 Introduction

1.1 TPS793xx Family of LDO Regulators

Like all LDO linear regulators, the TPS793xx family of LDO regulators use a

series pass element and feedback network, including an error amplifier and

voltagereference, to providea regulated outputvoltage from aslightly higher,

possibly varying input voltage. However, these regulators have been

optimized to reduce ripple and noise on the output. For example, advanced

feedbackcompensationtechniqueswereusedtoincreasethebandwidthand

open loop gain of the feedback network while maintaining stability with any

2.2-µFceramiccapacitor.SincePSRRisdirectlyproportionaltothefrequency

response of the loop of the error amplifier, these regulators’higher loop gain

and larger bandwidth result in better PSRR over a wider range of frequencies

than standard regulators. In addition to circuit design optimization to reduce

circuitnoise,theprimarycontributortothenoiseofany regulator,thebandgap

reference, has been pinned out to allow further noise reduction through the

use of a filtering capacitor. Capabilities of this regulator include:

-200-mA load current

-TPS793xx family is available in 1.8-V, 2.5 V, 2.8 V, 2.85 V, 3.0 V, 3.3-V,

4.75-V, and adjustable with positive ENABLE.

-PSRR of 75 dB at 10 kHz

-Approximately 30-µV output noise

-Start-up in approximately 60 µs

-Excellent line and load transient responses

-Very low dropout voltage

-5-Pin SOT23 (DBV) package to minimize board space consumption

1.2 EVM Design Strategy

The purpose of this EVM is to facilitate evaluation of the TPS793xx family of

LDO regulators. Each EVM package contains one SLVP191 test board, with

either a TPS79301DBV linear regulator or a TPS79328DBV linear regulator,

as well as supporting passive components. The TPS79301DBV adjustable

device has been configured to provide 1.5-V output, and the TPS79328DBV

provides a 2.8-V output. The board’s small size and side clips facilitate

attaching it to other PCBs as a power module.

The board has additional passive components that can be configured to test

other SOT–23 packaged regulators with the same pin-out.

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