Texas Instruments bq24010-2 User Manual

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bq24010/2 (bqTINY )

1 A Single Chip Li Ion and Li Pol Charge Management IC With Integrated PowerFET and Current Sense Evaluation Module

User’s Guide

January 2003

PMP Portable Power

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 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, copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information published by TI regarding third–partyproducts 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

Copyright 2003, Texas Instruments Incorporated

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 requireddesign-,marketing-,and/ormanufacturing-relatedprotective 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

Copyright 2003, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the input voltage range of 5.6 V and the output voltage 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.

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

Copyright 2003, Texas Instruments Incorporated

Contents

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23.2 Physical Layouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-33.2.1 Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-33.3 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5

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

Figures

2–1Load Test Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-43–1EVM Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-23–2Assembly View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-33–3Top Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-43–4Bottom Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

Tables

1–1

Performance Specification Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-2

3–1

Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-5

v

Contents

vi

Chapter 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-managementsolution 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, forsingle-cellLi-IonorLi-Polapplications using a dc power supply.

Topic

 

Page

 

 

 

1.1

Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . 1-2

1.2

Performance Specification Summary . . . . . . . . . . . . . . . . . . . . . . . . . .

. 1-2

 

 

 

bqTINY is a trademark of Texas Instruments.

1-1

Background

1.1 Background

The bqTINY series are highly integrated Li-IonandLi-Pollinear 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-sensinginput for detecting hot or cold battery packs, power good (PG) output indicating the presence of the ac adapter, aTTL-levelcharge enable input (CE) to disable or enable the charge process, and aTTL-leveltimer andtermination-enable(TTE) input to disable or enable thefast-chargetimer and charge termination.

1.2 Performance Specification Summary

This section summarizes the performance specifications of the EVM. Table 1–1gives the performance specifications of the EVM.

Table 1–1.Performance Specification Summary

Specification

Test Conditions

Min

 

Typ

Max

Units

 

 

 

 

 

 

 

 

Input dc voltage, V

 

V

REG

+0.5

5.0

5.2

V

I(DC)

 

 

 

 

 

 

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 programmed 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+).

1-2

Chapter 2

Test Summary

This chapter shows the test setups used and the tests performed in evaluating the EVM.

Setup: The bq24010/2 EVM board requires a5-VDC,1-Apower source to provide input power and asingle-cellLi-IonorLi-Polbattery pack. The test setup connections and jumper setting selections are configured for astand-aloneevaluation 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

 

 

 

Test Summary

2-1

I/O and Jumper Connections

2.1 I/O and Jumper Connections

Jack

Connect To:

J1–DC+

Power supply positive, preset to 5.0VDC, 1-Acurrent 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

External hardware if J4-EXTis jumpered (Not jumpered from factory)

 

 

 

 

J3–STAT2

External hardware if J5-EXTis jumpered (Not jumpered from factory)

 

 

 

 

J3–DC–

Return for J3 signals

 

 

 

 

 

External hardware if J6–EXTif jumpered (Not jumpered from factory)

J3–PG

 

 

 

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

Set up the evaluation board as described above, by making the necessary I/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 with a low current (typically IO(CHG)/10 = 0.7A/10 = 70 mA) until the battery voltage reaches the V(LOWV) threshold or until the precharge timer expires. If the timer expires, then the charge current is terminated, the

bq24010/2 enters fault mode, and both LEDs turn off. Toggling input power or battery replacement resets fault mode.

3)Once the battery voltage is above the V(LOWV) threshold, the battery entersfast-chargemode. 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-chargemode until thefast-chargetimer expires, the charge taper time expires, or the charge termination threshold is reached.

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

2-2