Texas Instruments SLUU083A User Manual
User’s Guide
July 2002 Advanced Analog Products
SLUU083A
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About This Manual
Trademarks
Preface
Read This First
This user’s guide describes the bq2400x evaluation module. The EVM conve-
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-tested charger, which delivers up to 1.2 A of continuous-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.
Read This First
iii
Running Title—Attribute Reference
Contents
1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Background 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Performance Specification Summary 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 T est 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contents
v
Chapter 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
a complete designed-and-tested charger, which delivers up to 1.0 A of continuous-charge current for one- or two-cell applications.
Topic Page
1.1 Background 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Performance Specification Summary 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1
Background
B
I
A
B
V
V
Th
C
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.
The bq2400x automatically restarts the charge if the battery voltage falls below
an internal recharge threshold.
Table 1–1.Performance Specification Summary (One Cell)
Specification Test Conditions Min Typ Max Units
Input dc voltage, V
attery charge current,
attery voltage regulation,
erm fault
APG (user defined, see data sheet) J2 set to APG ‡
Power dissipation, P
†
VI, for a single-cell, should not exceed 5.3 VDC for the 1-A charge rate and 7.6 V for the 0.5-A charge rate. (VI is the input voltage
to the bq2400x IC, pins 2 and 3. The power supply source voltage, at J1, is 0.1 V larger than VI because of the regulated voltage
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.
DC
J4 shorted, J3 open 0.4 0.5 0.6
CHG
REG
High, T
BATMAX
Low, T
BATMIN
D
J3 shorted, J4 open 0.9 1 1.1
J6 set to V
J6 set to GND 4.05 4.1 4.15
J2 set to Therm 43 48 53
J2 set to Therm 0 5 10
(VI-VO) × I
CC
load
4.9 5.0 † V
4.15 4.20 4.25
2.3 W
°
°
1-2
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