Texas Instruments Sluu083a User Manual

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User’s Guide  
July 2002  
Advanced Analog Products  
SLUU083A  
Preface  
Read This First  
About This Manual  
This users 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 1Introduction  
- Chapter 2Test Summary  
- Chapter 3Physical Layouts  
- Chapter 4Bill of Materials  
- Appendix ASchematic  
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  
31  
32  
33  
SLUP051 Board Layout Top Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
SLUP051 Board Layout Bottom Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
SLUP051 Top Assembly View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2  
Tables  
11  
12  
42  
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 users 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 11 gives the performance specifications of the hubs.  
Thebq2400xautomaticallyrestartsthechargeifthebatteryvoltagefallsbelow  
an internal recharge threshold.  
Table 11.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 12.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:  
J1VCC  
Power source positive output  
Power source negative output  
Positive lead of single lithium cell  
Negative lead of single lithium cell  
Tie to batterys positive terminal  
Tie to thermistor lead in battery pack  
Tie to other thermistor lead (may be GND)  
J1GND  
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 batterys 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-, 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 ,  
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-, 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-, 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  
14-5-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 31. SLUP051 Board Layout Top Layer  
3-2  
Board Layout  
Figure 32. SLUP051 Board Layout Bottom Layer  
Figure 33. 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 41.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 k, 1%, 1/10W, see Note 1  
Resistor, 316 , 1%, 1/10W, see Note 1  
Resistor, 0.10 , 2%, 1W  
805  
CR0805-10W3163JT  
LR2512-01-R100-G  
LR2512-01-R200-G  
CR0805-10W1872F  
CR0805-10W5110F  
805  
2512  
2512  
805  
Resistor, 0.20 , 2%, 1W  
IRC  
Resistor, 18.7 k, 1%, 1/10W, see Note 1  
Resistor, 511 , 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 k, 1%, 1/10W, see Note 1  
Resistor, 100 , 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 42 lists the charge status configurations for the bq2400x.  
Table 42.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  

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