Texas Instruments SLUU083A Manuale utente

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July 2002 Advanced Analog Products

User’s Guide

SLUU083A

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Trademarks

iii

Read This First

Preface

Read This First

About This Manual

Thisuser’sguidedescribesthe bq2400xevaluationmodule.TheEVMconve-

niently evaluates a linear Li-ion bq2400x charge-management solution for

one- and two-cell battery-pack applications. This guide describes a complete

designed-and-testedcharger,whichdeliversupto1.2Aofcontinuous-charge

current for one- or two-cell applications

How to Use This Manual

This document contains the following chapters:

-Chapter 1—Introduction

-Chapter 2—Test Summary

-Chapter 3—Physical Layouts

-Chapter 4—Bill of Materials

-Appendix A—Schematic

Related Documentation From Texas Instruments

-bq24001, bq24002, bq24003 data sheet, literature number

SLUS462A

-bq24004, bq24005, bq24006 data sheet, literature number

SLUS476

Trademarks

PowerPAD is a trademark of Texas Instruments.

Running Title—Attribute Reference

Contents

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

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

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

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

2.1 Setup 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.1 I/O Connections 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.2 Jumper-Selectable Configuration 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Test Procedures 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.1 For Single-Cell Applications 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.2 For Two-Cell Applications 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Physical Layouts 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Board Layout 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

4.1 Bill of Materials 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.2 bq2400x Charge Status Configurations 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A Schematic A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figures

3–1 SLUP051 Board Layout Top Layer 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–2 SLUP051 Board Layout Bottom Layer 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–3 SLUP051 Top Assembly View 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Schematic A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

1–1 Performance Specification Summary (One Cell) 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–2 Performance Specification Summary (Two Cell) 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–2 SLUP051 Bill of Materials 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

Introduction

This user’s guide describes the bq2400x Evaluation Module (SLUP051). The

EVM conveniently evaluates a linear Li-ion bq2400x charge-management

solution for one- and two-cell battery-pack applications. This guide describes

acompletedesigned-and-testedcharger,whichdeliversupto1.0Aofcontinu-

ous-charge current for one- or two-cell applications.

Topic Page

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

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

Chapter 1

Background

1-2

1.1 Background

The bq2400x series ICs are advanced Li-Ion linear charge management

devices for highly integrated and space-limited applications. They combine

high-accuracy current and voltage regulation; FET pass-transistor and

reverse-blocking Schottky; battery conditioning, temperature, or input-power

monitoring; charge termination; charge-status indication; and charge timer in

a small, 20-lead TSSOP PowerPAD package.

The bq2400x continuously measures battery temperature using an external

thermistor. For safety reasons, the bq2400x inhibits charge until the battery

temperature is within the user-defined thresholds. Alternatively, the user can

monitor the input voltage to qualify charge. The bq2400x series then charge

the battery in three phases: preconditioning, constant current and constant

voltage. If the battery voltage is below the internal low-voltage threshold, the

bq2400x uses trickle-charge to condition the battery. A preconditioning timer

is provided for additional safety. Following preconditioning, the bq2400x

applies a constant-charge current to the battery. An external sense-resistor

sets the magnitude of the current. The constant-current phase is maintained

until the battery reaches the charge-regulation voltage. The bq2400x then

transitions to the constant voltage phase. The user can configure the device

for cells with either coke or graphite anodes.

Charge is terminated by either of the following methods:

-Maximum time

-Minimum current detection

1.2 Performance Specification Summary

This section summarizes the performance specifications of the SLUP051

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

Thebq2400xautomaticallyrestartsthechargeifthebatteryvoltagefallsbelow

an internal recharge threshold.

Table 1–1.Performance Specification Summary (One Cell)

Specification Test Conditions Min Typ Max Units

Input dc voltage, VDC 4.9 5.0 †V

Battery charge current ICHG

J4 shorted, J3 open 0.4 0.5 0.6

attery c

arge current,

CHG J3 shorted, J4 open 0.9 1 1.1

Battery voltage regulation VREG

J6 set to VCC 4.15 4.20 4.25

attery vo

tage regu

on,

REG J6 set to GND 4.05 4.1 4.15

Therm fault

High, TBATMAX J2 set to Therm 43 48 53 °

erm

tLow, TBATMIN J2 set to Therm 0 5 10 °

APG (user defined, see data sheet) J2 set to APG ‡

Power dissipation, PD(VI-VO)×Iload 2.3 W

†VI,forasingle-cell,shouldnotexceed5.3VDCforthe1-Achargerateand7.6Vforthe0.5-Achargerate.(VIistheinputvoltage

tothebq2400xIC,pins2and3.Thepowersupplysourcevoltage, at J1, is 0.1VlargerthanVIbecauseoftheregulatedvoltage

drop across the current sense resistor, during constant current regulation.)

‡If J2 is set to APG, then the chip will be disabled when the input is outside of this range: 4.02 V±0.07 V and 10.76 V ±0.09 V.

Performance Specification Summary

1-3

Introduction

Table 1–2.Performance Specification Summary (Two Cell)

Specification Test Conditions Min Typ Max Units

Input dc voltage, VDC 9.1 9.5 †V

Battery charge current ICHG

J4 shorted, J3 open 0.4 0.5 0.6

attery c

arge current,

CHG J3 shorted, J4 open 0.9 1 1.1

Battery voltage regulation VREG

J6 set to VCC 8.35 8.40 8.45

attery vo

tage regu

on,

REG J6 set to GND 8.15 8.20 8.25

Therm fault

High, TBATMAX J2 set to Therm 43 48 53 °

erm

tLow, TBATMIN J2 set to Therm 0 5 10 °

APG (user defined, see data sheet) J2 set to APG ‡

Power dissipation, PD(VI-VO)×Iload 2.3 W

†VI, for a 2-cell, should not exceed 9.1 VDC for the 1-A charge rate and 10.6 V for the 0.5-A charge rate. (VIis the input voltage

tothebq2400xIC,pins2and3.Thepowersupplysourcevoltage, at J1, is 0.1VlargerthanVIbecauseoftheregulatedvoltage

drop across the current sense resistor, during constant current regulation.)

‡If J2 is set to APG, then the chip will be disabled when the input is outside of this range: 4.02 V±0.07 V and 10.76 V ±0.09 V.

2-1

Test Summary

Thischaptershowsthetestsetupsused,andthetestsperformed,indesigning

the bq2400xEVM.

Topic Page

2.1 Setup 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Test Procedures 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 2

Setup

2-2

2.1 Setup

The bq2400X EVM board requires a DC power source to provide input power

and a single-cell lithium-ion or lithium-polymer battery to charge.

Note:

Other versions of the bq2400x IC can charge two-cell battery packs.

The test setup connections and jumper setting selections are listed below.

2.1.1 I/O Connections

Jack Connect to:

J1–VCC Power source positive output

J1–GND Power source negative output

J9–+ Positive lead of single lithium cell

J9––Negative lead of single lithium cell

J9 –VSENSE Tie to battery’s positive terminal

J10 –THERM Tie to thermistor lead in battery pack

J10 –GND Tie to other thermistor lead (may be GND)

2.1.2 Jumper-Selectable Configuration

Jumper Selection

J3 1-A charge, use two jumpers placed horizontally; no jumpers on J4

J4 0.5-A charge, use two jumpers placed horizontally, no jumpers on J3

J2 Adapter power good (APD) or battery’s thermistor

J5†Enable, on or off

J6 Regulationvoltage,4.2Vor4.1V(singlecell),8.4Vor8.2V(doublecell)

J7 Timer, 3-hour (float, no jumper), 4.5-hour, or 6-hour

J8 Stat2 green diode, connect for bq24002/3/5/6/8‡

†Thisjumperenables/disablestheICforbq24001/2/3/4/5/6.Forbq24007/8,thisjumperenables/

disables the change timer.

‡For bq24003/6/8 the evaluation board used two LED (red and green) in place of a single

dull-color LED. Therefore, when both LEDs are lit a yellow status is indicated.

2.2 Test Procedures

2.2.1 For Single-Cell Applications

Setuptheevaluationboardasdescribedabove,bymakingthenecessaryI/O

connections and jumper selections.

Note:

Before test and evaluation, it is important to verify that the maximum power

dissipation on the IC is not exceeded. Pmax = 2.3 W.

Pdiss, single cell = (VI–3 V) ×ICHG where VI= VCC –0.1 V

Test Procedures

2-3

Test Summary

Note:

VIfor a single cell should not exceed 5.3 VDC for the 1-A charge rate and

7.6 V for the .5-A charge rate.

Adjusttheinputpowersupplyfor5V. TheredLEDshouldilluminatetoindicate

charging, unless there is a fault or the battery is fully charged.

The bq2400x enters preconditioning mode if the battery is below the LowV

threshold. In this mode, the bq2400x trickle-charges with approximately

65 mA for approximately 23 minutes. If the battery does not reach the LowV

threshold after this period, then the charge current is terminated and the

bq2400x enters fault mode. The red LED flashes when in fault mode. This

feature may be tested in the .5-A charge mode by using a 5-Ω, 3-W resistor

in place of the battery. Fault mode is reset by toggling input power or enable

pin.

Once the battery charges to the LowV-stop threshold, the battery enters fast

charge mode and charges at the selected ICHG level (0.5-1 A).

The battery remains at the fast-charge mode until either the selected time

expires or the battery charges to the selected regulation voltage.

The time-out feature may be tested in the 0.5-A charge mode by using a 7 Ω,

3-Wresistorinplaceof thebattery.Applytheresistorafter theunitispowered.

If the battery discharges down to the HighV threshold, the charger starts fast

charging.Therefreshfeaturemaybetestedinthe0.5-Achargemodebyusing

a 7-Ω, 3-W resistor in parallel with a fully charged battery.

The circuit has an overvoltage comparator for added protection. If the battery

voltage exceeds this threshold for 330 ms, then the charger goes into fault

mode. This may be tested by connecting an external power supply in place of

the battery and adjusting the voltage above the threshold.

2.2.2 For Two-Cell Applications

Setuptheevaluationboardasdescribedabove,bymakingthenecessaryI/O

connections and jumper selections.

Note:

Before test and evaluation, it is important to verify that the maximum power

dissipation on the IC is not exceeded. Pmax = 2.3 W.

Pdiss, 2cell = (VI–6.8 V) ×ICHG where VI= VCC –0.1 V

Note:

Withatwo-cellbatterypackat6V, chargingat1A, theICpowerdissipation

istemporarilyashigh as3.1Wuntilthepack chargesto6.8V.Thiscondition

is acceptable for the short time before the pack reaches 6.8 V.

Adjust the input power supply for 9.1 V. The red LED should illuminate to

indicate charging, unless there is a fault or the battery is fully charged.

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