Texas Instruments Bq24010/2 Manuale utente

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January 2003 PMP Portable Power

User’s Guide

SLUU125A

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,thekitmaybereturned

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 OFMERCHANTABILITYOR FITNESSFOR 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

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

EVM WARNINGS AND RESTRICTIONS

ItisimportanttooperatethisEVMwithintheinputvoltagerangeof5.6Vandtheoutputvoltage

range of 0 V and 4.25 V.

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

60°C.TheEVM isdesignedto operateproperlywith certaincomponentsabove 60°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

Contents

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

1.1 Background 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Performance Specification Summary 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Test Summary 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 I/O and Jumper Connections 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Test Procedure 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.1 Equipment 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.2 Equipment Setup 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.3 Procedure 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Schematic, Physical Layouts, and Bill of Materials 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Schematic 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Physical Layouts 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.1 Board Layout 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3 Bill of Materials 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4 Reference 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figures

2–1 Load Test Board 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1 EVM Schematic Diagram 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–2 Assembly View 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–3 Top Layer 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–4 Bottom Layer 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

1–1 Performance Specification Summary 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1 Bill of Materials 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents

1-1

Introduction

This user’s guide describes the bq24010/2 (bqTINY) evaluation module.

The EVM provides a convenient method for evaluating the performance of a

charge-management solution for portable applications using the bq24010/2

product family. A complete designed and tested charger is presented. The

charger is designed to deliver up to 1.0 A of continuous charge current, but is

programmed for 0.7 A, for single-cell Li-Ion or Li-Pol applications using a dc

power supply.

Topic Page

1.1 Background 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Performance Specification Summary 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 1

bqTINY is a trademark of Texas Instruments.

Background

1-2

1.1 Background

The bqTINY series are highly integrated Li-Ion and Li-Pol linear charge

management devices targeted at space limited portable applications. In a

small package, the bqTINY series offer integrated PowerFET and current

sensor, reverse blocking diode, high accuracy current and voltage regulation,

charge status, and charge termination.

The bqTINY charges the battery in three phases: conditioning, constant

current, and constant voltage. Charge is terminated on the basis of minimum

current. An internal charge timer provides backup safety for charge

termination. The bqTINY automatically restarts the charge if the battery

voltage falls below an internal threshold. The bqTINY automatically enters

sleep mode when VCC supply is removed.

In addition to the standard features, different versions of the bqTINY offer a

multitude of additional features. These include temperature-sensing input for

detecting hot or cold battery packs, power good (PG) output indicating the

presence of the ac adapter, a TTL-level charge enable input (CE) to disable

or enable the charge process, and a TTL-level timer and termination-enable

(TTE)input to disableorenablethe fast-charge timer andchargetermination.

1.2 Performance Specification Summary

This section summarizes the performance specifications of the EVM.

Table 1–1 gives the performance specifications of the EVM.

Table 1–1.Performance Specification Summary

Specification Test Conditions Min Typ Max Units

Input dc voltage, VI(DC) VREG+0.5 5.0 5.2†V

Battery charge current, IO(CHG) See note 0.7†A

Power dissipation (V(DC+) –V(BAT+))*I(CHG) 1.5 W

†This input voltage maximum is a function of the maximum allowable power dissipation on the IC. The current level is pro-

grammed for 0.7 amps. If the programmed charge is changed, then the maximum input voltage needs to be adjusted.

PmaxIC = 1.5 Watt = ICHG(VDC+ –VBAT+).

2-1

Test Summary

Thischaptershowsthetestsetupsusedandthetestsperformedinevaluating

the EVM.

Setup: The bq24010/2 EVM board requires a 5-VDC, 1-A power source to

provideinputpowerandasingle-cellLi-IonorLi-Polbatterypack.Thetestset-

upconnectionsandjumpersettingselectionsareconfiguredforastand-alone

evaluation but can be changed to interface with external hardware, such as a

microcontroller.

Topic Page

2.1 I/O and Jumper Connecations 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Test Procedure 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 2

I/O and Jumper Connections

2-2

2.1 I/O and Jumper Connections

Jack Connect To:

J1–DC+ Power supply positive, preset to 5.0VDC, 1-A current limit.

J1–DC–Power supply ground

J2–BAT+ Positive battery pack terminal

J2–BAT–Negative battery pack terminal

J2–TS NC

J2–BAT–NC

J3–STAT1 ExternalhardwareifJ4-EXTisjumpered(Notjumperedfromfactory)

J3–STAT2 ExternalhardwareifJ5-EXTisjumpered(Not jumperedfromfactory)

J3–DC–Return for J3 signals

J3–PG Externalhardware ifJ6–EXTifjumpered(Notjumperedfromfactory)

J4 (Jumper) STAT1 indication location –LED (EVM) | EXT

J5 (Jumper) STAT2 indication location –LED (EVM) | EXT

J6 (Jumper) PG indication location –LED (EVM) | EXT

Note: Factory jumper selections shown in bold.

2.2 Test Procedure

Setuptheevaluationboardasdescribedabove,bymakingthenecessaryI/O

connections and jumper selections. Before test and evaluation, it is

important to verify that the maximum power dissipation on the IC is not

exceeded: P(MAX) = 1.5 watts.

1) Turn on the power supply, which was preset to 5.0 VDC and 1 A for the

current limit setting.

2) The bq24010/2 enters preconditioning mode if the battery is below the

V(LOWV) threshold. In this mode, the bq24010/2 precharges the battery

withalowcurrent(typicallyIO(CHG)/10=0.7A/10=70mA)untilthebattery

voltage reaches the V(LOWV) threshold or until the precharge timer

expires. If the timer expires, then the charge current is terminated, the

bq24010/2entersfaultmode,andbothLEDsturnoff.Togglinginputpower

or battery replacement resets fault mode.

3) Once the battery voltage is above the V(LOWV) threshold, the battery

enters fast-charge mode. This EVM is programmed for 0.7 amps of fast

charging current.

4) Once the battery reaches voltage regulation (4.2 V), the current tapers

down as the battery reaches its full capacity.

5) The battery remains at the fast-charge mode until the fast-charge timer

expires,thechargetapertimeexpires,orthechargeterminationthreshold

is reached.

6) If the battery discharges to the recharge threshold, the charger starts fast

charging.

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