TI SLUU110A

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User’s Guide
June 2002
Advanced Analog Products
SLUU110A
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Copyright  2002, Texas Instruments Incorporated
Trademarks
Preface
Read This First
About This Manual
This user’s guide describes the bq24004/5/6 evaluation module (SLUP051).
The SLUP051 conveniently evaluates a linear Li-ion charge-management
solution that uses the bq24004/5/6. This guide describes a complete designed-and-tested charger, which delivers up to 1.0 A of continuous-charge
current for 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
-
bq24004, bq24005, bq24006 data sheet, literature number
SLUS476
Trademarks
PowerPAD is a trademark of Texas Instruments.
Read This First
iii
iv
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
Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.1 I/O Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.2 Jumper-Selectable Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2
Test Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.1 For Two-Cell Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
Physical Layouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1
Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
4
Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1
Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
A
Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
2-1
2-2
2-2
2-2
2-2
2-2
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
Tables
1–1
4–2
Performance Specification Summary (Two Cell) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
SLUP051 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Contents
v
vi
Chapter 1
Introduction
This user’s guide describes the bq24004/5/6 evaluation module (SLUP051).
The SLUP051 conveniently evaluates a linear Li-ion charge-management
solution for battery-pack applications that uses the bq24004/5/6. This guide
describes a complete designed-and-tested charger, which delivers up to 1.0 A
of continuous-charge current.
Topic
Page
1.1
Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.2
Performance Specification Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1-1
Background
1.1 Background
The bq24004/5/6 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 bq24004/5/6 continuously measures battery temperature using an
external thermistor. For safety reasons, the bq24004/5/6 inhibits charge until
the battery temperature is within the user-defined thresholds. Alternatively, the
user can monitor the input voltage to qualify charge. The bq24004/5/6 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 bq24004/5/6 uses trickle-charge to condition the battery. A
preconditioning timer is provided for additional safety. Following
pre-conditioning, the bq24004/5/6 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 bq24004/5/6 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 plus 23-minute timeout
1.2 Performance Specification Summary
This section summarizes the performance specifications of the bq24004/5/6
EVM. Table 1–1 gives the performance specifications of the hubs.
The bq24004/5/6 automatically restarts the charge if the battery voltage falls
below an internal recharge threshold.
Table 1–1. 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
0.9
1
1.1
A
J6 set to VCC
8.35
8.40
8.45
J6 set to GND
8.15
8.20
8.25
Battery voltage regulation,
regulation VREG
Therm fault
High, TBATMAX
J2 set to Therm
43
48
53
Low, TBATMIN
J2 set to Therm
0
5
10
APG (user defined, see data sheet)
J2 set to APG
Power dissipation, PD
(VI-VO) × Iload
V
°C
‡
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. (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 is disabled when the input is outside of this range: 4.02 V±0.07 V and 10.76 V ±0.09 V.
1-2
Chapter 2
Test Summary
This chapter shows the test setups used, and the tests performed, in designing
the bq24004/5/6 EVM.
Topic
Page
2.1
Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.2
Test Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Test Summary
2-1
Setup
2.1 Setup
The bq24004/5/6 EVM board requires a dc power source 9–10VDC, ≥ 1.1 A
or equivalent to provide input power and a dual-cell lithium-ion or
lithium-polymer battery to charge. Adjust the power supply for 9.1 ±0.1 VDC
and set the current limit to 1.3 A ±0.2 A. Power down the supply.
Note:
bq24005/6 ICs can be evaluated by replacing reference designator U1 with
the desired version. Refer to the IC data sheet for the correct status display
and the BOM for the correct status components (D1, D2, U2, J6).
The test setup connections and jumper setting selections are listed below.
2.1.1
2.1.2
I/O Connections
Jack
Connect to:
J1 – VCC
Power source positive output
J1 – DC–
Power source negative output
J7 – BAT+
Positive lead of dual lithium-ion cell
J7 – BAT–
Negative lead of dual lithium-ion cell
J7 – VSENSE
Tie to battery’s positive terminal
J8 – THERM
Tie to thermistor lead in battery pack
J8 – DC–
Tie to other thermistor lead (may be same wire as BAT–)
Jumper-Selectable Configuration (Factory Set to Bold Selections)
Jumper
Selection
J2
Adapter power good (APG) or battery thermistor, APG/THRM
J3
Enable, on or off
J4
Regulation voltage per cell, 4.2 V or 4.1 V
J5
Timer, 3-hour (float, no jumper), 4.5-hour, or 6-hour
J6
Stat2 green diode, jumper for bq24005/6
2.2 Test Procedures
2.2.1
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. Pmax = 2.3 W.
Pdiss, 2 cell = (VI – 6.8 V) × ICHG
2-2
where VI = VCC –0.1 V
Test Procedures
Note:
For the two-cell case, at 1-A charge rate, where the battery pack is at 6 V,
the power dissipation is temporarily as high as 3.1 W until the pack charges
to 6.8 V. This condition is fine for the short time (~1 min.) before the pack
reaches 6.8 V.
Adjust the input power supply for 9.1 V. The red LED illuminates to indicate
charging, unless there is a fault or the battery is fully charged.
The bq24004/5/6 enters preconditioning mode if the battery is below the LowV
threshold. In this mode, the bq24004/5/6 trickle-charges with approximately
65 mA for approximately 23 minutes. If the battery does not reach the LowV
threshold during this period, then the charge current is terminated and the
bq24004/5/6 enters fault mode. The red LED flashes in fault mode. This
feature may be tested by removing input power, replacing the battery with a
30–40-Ω resistor from BAT+ to DC–, and applying power (Vin) for more than
23 minutes. Fault mode is reset by toggling input power or enable pin.
Once the battery charges to the LowV-stop threshold, the battery enters fastcharge mode and charges at the programmed 1-A level. Program charge level
may be changed by adjusting R3
ǒ
Ǔ
R3 + 0.10 V .
I
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 is tested by using a 25–28-Ω, 5-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. The refresh feature may be tested by charging a battery to
completion (Iterm + 23 minutes) and, without disconnecting the battery,
installing a 8–10-Ω, 10-W resistor in parallel with the battery. The regulator
should start charging once the HIGHV threshold is reached. Note: The battery
is still charging for another 23 minutes after the LED turns off. If a load (>Iterm)
is applied before the 23 minutes has timed out then the load resets the 23
minute timer.
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.
Test Summary
2-3
2-4
Chapter 3
Physical Layouts
This chapter contains the board layout and assembly drawings for the
SLUP051 board used for the bq24004/5/6 EVM.
Topic
3.1
Page
Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Physical Layouts
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 bq24004/5/6 EVM.
It also specifies the charge status configurations for the bq24004/5/6 ICs.
Topic
4.1
Page
Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Bill of Materials
4-1
Bill of Materials
4-2
4.1 Bill of Materials
Table 4-1 lists materials required for the bq24004/5/6 EVM using the SLUP051 (PWB) baord..
Bill of Materials
Table 4–1. bq24004/5/6 EVM (SLUP051) Bill of Materials
Item #
–001
bq24004
–002
bq24005
–003
bq24006
RefDes
Description
Size
MFR
Part Number
1
2
2
2
C1, C4
Capacitor, tantalum, 10-µF, 16 V
1210
Panasonic
ECS–T1CX106R
2
1
1
1
C2
Capacitor, ceramic, 0.1-µF, 16 V X7R
805
Panasonic
ECJ–2VB1C104K
3
1
1
1
C3
Capacitor, ceramic, 0.22-µF, 16 V X7R
805
Panasonic
ECJ–2VB1C224K
4
1
1
1
C5
Capacitor, ceramic, 10-pF, 50 V, NPO, 1%
603
Panasonic
ECJ–1VC1H100D
5
1
1
0
D1
LED, red, 20 mA maximum
Panasonic
LN1271R–(TR)
6
0
1
0
D2
LED, green, 20 mA maximum
Panasonic
D–LN1371G–(TR)
7
0
0
1
U2
LED, BiColor, red/green, 20 mA maximum
Chicago Miniature Lamp
CMD67–22SRUGC/TR8
8
2
2
2
J1, J10
Terminal block, 2 pin, 6 A, 3,5 mm
75525
OST
ED1514
9
4
4
4
J2, J3,
J4, J5
Header, 3 pin, 100 mil spacing, (36-pin strip)
34100
Sullins
PTC36SAAN
10
0
1
1
J6
Header, 2 pin, 100 mil spacing, (36-pin strip)
23100
Sullins
PTC36SAAN
11
1
1
1
J7
Terminal block, 3 pin, 6 A, 3,5 mm
112625
OST
ED1515
12
1
1
1
R1
Resistor, chip, 51.1 kΩ, 1/16 W, 1%
603
Std
Std
13
1
1
1
R10
Resistor, chip, 10 MΩ, 1/16 W, 1%
603
Std
Std
14
1
1
1
R2
Resistor, chip, 316 kΩ, 1/16 W, 1%
603
Std
Std
15
1
1
1
R3
Resistor, chip, 0.1 Ω, 1/8 W
1206
Panasonic
ERJ–8RSJR10
16
1
1
1
R5
Resistor, chip, 18.7 kΩ, 1/16 W, 1%
603
Std
Std
17
2
2
2
R6, R8
Resistor, chip, 1 kΩ, 1/16 W, 1%
603
Std
Std
18
1
1
1
R7
Resistor, chip, 95.3 kΩ, 1/16 W, 1%
603
Std
Std
19
1
1
1
R9
Resistor, chip, 2 kΩ, 1/16 W, 1%
603
Std
Std
20
1
0
0
U1
IC, dual Li-ION, charger, 1 LED
20 pin TSSOP
TI
bq24004PWP
21
0
1
0
U1
IC, dual Li-ION, charger, 2 LED
20 pin TSSOP
TI
bq24005PWP
22
0
0
1
U1
IC, dual Li-ION, charger, bicolor LED
20 pin TSSOP
TI
bq24006PWP
Table 4–1. bq24004/5/6 EVM (SLUP051) Bill of Materials (Continued)
Item #
–001
bq24004
–002
bq24005
–003
bq24006
23
1
1
1
PWB
24
4
5
5
Shunts
RefDes
Description
Size
PWB, bq24004/5/6PWP (SLUP051)–EVM
Shunts for header – J2–J6, 4 to 5 shunts
0.1”
MFR
Part Number
TI
SLUP051 Rev. A
Sullins Electronics Corp.
SPC02SYAN
Assembly Note:
1) Shunts to be applied to J2–APG, J3–ON, J4–4.2V, J5–4.5Hr, and J6 if required
4-3
Bill of Materials
Bill of Materials
Bill of Materials
4-4
Bill of Materials
Appendix A
Schematic
This chapter contains the schematic diagram for the EVM.
Topic
A.1
Page
Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Schematic
A-1
J5
R8
1 kΩ
1
R6
1 kΩ
U2
TMR
JUMPER
U1
bq2400x
J1
DC+
DC–
R3
0.1 Ω
1
2
C2
0.1 µF
C1
10 µF
1
2
3
4
5
6
7
8
9
10
N/C
NC
OUT
IN
OUT
IN
VSNS
VCC
AGND
SNS
STAT2
NC
STAT1
APG/THM
TMR_SEL
EN
CR
VSEL
NC
PBKG
R2
316 kΩ
R
R9
2 kΩ
D1
C4
10 µF
3
2
1
J7
BAT+
BAT–
SENSE+
R10
10 MΩ
2 1
C5
10 pF
J6
STAT2 JUMPER
1 2 3
J3
R5
18.7 kΩ
J4
EN JUMPER
VSEL
JUMPER
C3
0.22 µF
2
1
1 2 3
R1
51.1 kΩ
G
20
19
18
17
16
15
14
13
12
11
THERMAL_PAD
1 2 3
D2
J2
R7
95.3 kΩ
APG/THM
JUMPER
“BAT–” is “DC–”
J8
THERMISTOR
BAT–
Figure A–1 shows the SLUP051 EVM schematic diagram.
2
3
Schematic
A.1 Schematic
A-2
Check BOM for correct component selection on
D1, D2, R6, R8, and U2 for IC selected.