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User’s Guide
July 2002
Advanced Analog Products
SLUU083A
Preface
Read This First
About This Manual
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.
iii
Contents
1
2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1
1.2
Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Performance Specification Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
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
Test Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.2.1 For Single-Cell Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.2.2 For Two-Cell Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2
3
4
Physical Layouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1 Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1
4.2
Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
bq2400x Charge Status Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
A
Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Figures
3–1
3–2
3–3
SLUP051 Board Layout Top Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
SLUP051 Board Layout Bottom Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
SLUP051 Top Assembly View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Tables
1–1
1–2
4–2
Performance Specification Summary (One Cell) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Performance Specification Summary (Two Cell) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
SLUP051 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
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
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
1-1
Background
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
4.9
Typ
5.0
Max Units
Input dc voltage, V
†
0.6
1.1
V
DC
J4 shorted, J3 open
J3 shorted, J4 open
0.4
0.9
0.5
1
Battery charge current, I
A
CHG
J6 set to V
4.15 4.20 4.25
CC
Battery voltage regulation, V
V
REG
J6 set to GND
J2 set to Therm
J2 set to Therm
J2 set to APG
(V -V ) × I
4.05
43
0
4.1 4.15
High, T
48
5
53
10
BATMAX
Therm fault
°C
Low, T
BATMIN
APG (user defined, see data sheet)
‡
Power dissipation, P
D
2.3
W
I
O
load
†
‡
V , 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. (V is the input voltage
I
I
to the bq2400x IC, pins 2 and 3. The power supply source voltage, at J1, is 0.1 V larger than V because of the regulated voltage
I
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.
1-2
Performance Specification Summary
Table 1–2.Performance Specification Summary (Two Cell)
Specification
Test Conditions
Min
9.1
Typ
9.5
Max
Units
Input dc voltage, V
†
V
DC
J4 shorted, J3 open
J3 shorted, J4 open
0.4
0.9
0.5
1
0.6
1.1
Battery charge current, I
A
V
CHG
J6 set to V
8.35 8.40 8.45
8.15 8.20 8.25
CC
Battery voltage regulation, V
REG
J6 set to GND
J2 set to Therm
J2 set to Therm
J2 set to APG
(V -V ) × I
High, T
43
0
48
5
53
10
BATMAX
Therm fault
°C
Low, T
BATMIN
APG (user defined, see data sheet)
‡
Power dissipation, P
D
2.3
W
I
O
load
†
‡
V , 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. (V is the input voltage
I
I
to the bq2400x IC, pins 2 and 3. The power supply source voltage, at J1, is 0.1 V larger than V because of the regulated voltage
I
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.
Introduction
1-3
Chapter 2
Test Summary
Thischaptershowsthetestsetupsused, andthetestsperformed, indesigning
the bq2400xEVM.
Topic
Page
2.1 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.2 Test Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2-1
Setup
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
Power source negative output
Positive lead of single lithium cell
Negative lead of single lithium cell
Tie to battery’s positive terminal
Tie to thermistor lead in battery pack
Tie to other thermistor lead (may be GND)
J1–GND
J9–+
J9– –
J9 – VSENSE
J10 – THERM
J10 – GND
2.1.2 Jumper-Selectable Configuration
Jumper Selection
J3
J4
J2
1-A charge, use two jumpers placed horizontally; no jumpers on J4
0.5-A charge, use two jumpers placed horizontally, no jumpers on J3
Adapter power good (APD) or battery’s thermistor
Enable, on or off
†
J5
J6
J7
J8
Regulationvoltage, 4.2Vor4.1V(singlecell), 8.4Vor8.2V(doublecell)
Timer, 3-hour (float, no jumper), 4.5-hour, or 6-hour
‡
Stat2 green diode, connect for bq24002/3/5/6/8
†
‡
This jumper enables/disables the IC for bq24001/2/3/4/5/6. For bq24007/8, this jumper enables/
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
Set up the evaluation board as described above, by making the necessary I/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.
P
= (V – 3 V) × I
where V = V
–0.1 V
CC
diss, single cell
I
CHG
I
2-2
Test Procedures
Note:
V for a single cell should not exceed 5.3 VDC for the 1-A charge rate and
I
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 I
level (0.5-1 A).
CHG
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-W resistor in place of the battery. Apply the resistor after the unit is powered.
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
Set up the evaluation board as described above, by making the necessary I/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. P
= 2.3 W.
max
P
= (V – 6.8 V) × I
where V = V
–0.1 V
CC
diss, 2 cell
I
CHG
I
Note:
With a two-cell battery pack at 6 V, charging at 1 A, the IC power dissipation
is temporarily as high as 3.1 W until the pack charges to 6.8 V. This condition
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.
Test Summary
2-3
Test Procedures
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 in fault mode. This feature
is tested in the 0.5-A charge mode by using a 10-Ω, 5-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 A/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 timeout feature is tested in the 0.5-A charge mode by using a 14-Ω, 5-W
resistor in place of the battery. Apply the resistor after the unit is powered up.
Once the battery voltage reaches voltage regulation (8.2 or 8.4 VDC), the
charge current tapers off as the battery charges.
If the battery discharges down to the HighV threshold, the charger starts fast
charging. The refresh feature is tested, in the 0.5-A charge mode, by using a
14-Ω 5-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 process may be tested by connecting an external power supply in
place of the battery and adjusting the voltage above the threshold.
2-4
Chapter 3
Physical Layouts
This chapter contains the board layout and assembly drawings for the
SLUP051 EVM.
Topic
Page
3.1 Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3-1
Board Layout
3.1 Board Layout
Figure 3-1 shows the top layer of the SLUP051. Figure 3-2 shows the bottom
layer. Figure 3-3 shows the SLUP051 top assembly view.
Figure 3–1. SLUP051 Board Layout Top Layer
3-2
Board Layout
Figure 3–2. SLUP051 Board Layout Bottom Layer
Figure 3–3. SLUP051 Top Assembly View
Physical Layouts
3-3
Chapter 4
Bill of Materials
This chapter contains the bill of materials required for the SLUP051 EVM. It
also specifies the charge status configurations for the bq2400x.
Topic
Page
4.1 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.2 bq2400x Charge Status Configurations . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4-1
Bill of Materials
4.1 Bill of Materials
Table 4-1 lists materials required for the SLUP051 EVM.
Table 4–1.SLUP051 Bill of Materials
Reference
Designator
Qty
Part Number
Description
MFG
Size
2
C1, C4
TAJC106M016R
Capacitor, 10 µF tantalum, 16 V, ±20%,
6032
AVX-Future 1210
1
1
1
1
C2
C3
C5
C0805X7R250-104KNE Capacitor, 0.1 µF ceramic, X7R, 25 V,
Venkel
805
805
805
±10%, 805
ECJ-2YB1E224K
ECJ-2VCH100F
Capacitor, 0.22 µF ceramic, X7R, 25 V,
Panasonic
Panasonic
±10%, 0805
Capacitor, 10 pF ceramic, NPO, 50 V,
±10%, 0805
D1
LN1361C(UY)-(TR)
LN1261CAL-(TR)
AKZ500/2WP
LED, green, GW type
LED, red, GW type
Panasonic
Panasonic
Altech
3M
D2
2
4
5
J1, J10
J2, J5-J7
Terminal block, 2 pin
Pin strip header, 3 pin
Pin strip header, 2 pin
2340-6111TG
J3a/b,
2380-6221TG
3M
J4a/b,J8
1
1
1
1
1
1
2
J9
ED350/3 (ED1610-ND)
CR0805-105113F
Terminal block, 3-pin
On shore
Venkel
Venkel
IRC
R1
R2
R3
R4
R5
Resistor, 51.1 kΩ, 1%, 1/10W, see Note 1
Resistor, 316 Ω, 1%, 1/10W, see Note 1
Resistor, 0.10 Ω, 2%, 1W
805
CR0805-10W3163JT
LR2512-01-R100-G
LR2512-01-R200-G
CR0805-10W1872F
CR0805-10W5110F
805
2512
2512
805
Resistor, 0.20 Ω, 2%, 1W
IRC
Resistor, 18.7 kΩ, 1%, 1/10W, see Note 1
Resistor, 511 Ω, 1%, 1/10W, see Note 1
Venkel
Venkel
R6, R8
(see Note 3)
805
1
1
1
1
R7
CR0805-10W9532F
CR0805-10W1000F
bq2400x (see Note 2)
bq2400x EVM REV B
Resistor, 95.3 kΩ, 1%, 1/10W, see Note 1
Resistor, 100 Ω, 1%, 1/10W, see Note 1
Battery charger, linear, lithium-ion
PWB, bq2400x EVM REV B
Venkel
Venkel
TI
805
R9
805
U1
HTSSOP-20
PWB
TI
Notes: 1) 5% tolerance rsistors may be used in place of 1% resistors if the application allows for it.
2) See Table 4.2 for 2400x charge stuatus configuration.
3) For bq24004/5/6 resistor value should be 1K.
4-2
bq2400x Charge Status Configurations
4.2 bq2400x Charge Status Configurations
Table 4–2 lists the charge status configurations for the bq2400x.
Table 4–2.Charge Status Configurations
Part Number
bq24001
bq24002
bq24003
bq24004
bq24005
bq24006
bq24007
bq24008
Number of Cells
Single cell
Single cell
Single cell
Two cell
Charge Status Configuration
Single LED
2 LED
Bicolor LED
Single LED
Two cell
2 LED
Two cell
Bicolor LED
Single LED
Single cell
Single cell
Bicolor LED
Bill of Materials
4-3
Appendix A
Schematic
This chapter contains the schematic diagram for the EVM.
Topic
Page
A.1 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
A-1
4
3
2
1
REVISIONS
DESCRIPTION
LTR ZONE
B
DATE APPROVED
X
X
D
C
B
A
D
C
B
A
VCC
R8
511
5%
R6
511
5%
U1
BQ24000
VCC
R9
1
2
20
J9
J3
J4
N/C
IN
N/C
R3
100
A1
A2
A1
A2
1
2
1
2
3 B1
4 B2
3 B1
4 B2
19
18
17
1
A
C
A
C
OUT
OUT
C4
10UF 16V
3
2
3
0.1
GRN
D2
RED
D1
IN
4
VCC
ISNS
N/C
VSENS
J8
5
16
AGND
STAT 2 JUMPER
R4
C2
6
15
STAT2
1
2
0.1UF
7
14
STAT1
0.2
APG/THM
EN
8
13
TMR_SEL
VCC
C5
10PF
9
12
CR
VSEL
PBKG
(NO JUMPER)
3 Hr
10
11
N/C
2
ON
OFF
2
C3
6 Hr
3
4.5 Hr
1
3
J1
0.22UF
1
C1
J5
J7
10UF
1
2
EN JUMPER
2
TMR JUMPER
4.2V
4.1V
1
3
J6
CHG VOLTAGE
JUMPER
R2
316K
1%
R5
18.7K
1%
J10
2
APG MODE
THERMISTOR MODE
1
1
2
1
3
2
J2
APG/THM JUMPER
R1
R7
51.1K
1%
95.3K
1%
TEXAS INSTRUMENTS
DRAWN
ENGR
CHK
DATE
05/23/2000
TITLE
S. MCGEE
SCHEMATIC
BQ2400X EVM
SIZE
CODE
DRAWING NO:
REV:
RELEASE
BQ2400X
D
NEXT ASSY
USED ON
C
FILE NAME:
DRAWING DATE
01/11/2001
APPLICATION
SCALE: NONE
SHEET 1 OF1
4
3
2
1
$1I217
|