User's Guide
SLUU392A – December 2009 – Revised June 2010
1.0-A Single-Input, Single-Cell Li-Ion Battery Charger
This user’s guide describes the bq24090/1/2/3 evaluation module (EVM), how to perform a stand-alone
evaluation or interface with a host or system. The charger is designed to deliver up to 1000mA of
continuous current to the battery output when programmed with a resistor on the ISET pin and is
programmed at the factory for ~540mA. The USB current limit modes are selected by the ISET2 pin and
limits current to a maximum of 500mA (logic high) or 100mA (float or high impedance). A low on the
ISET2 pin programs the charge current using the ISET resistor.
1
2
3
4
5
Contents
Introduction ..................................................................................................................
Considerations With Evaluating the bq24090/1/2/3 ....................................................................
Performance Specification Summary .....................................................................................
Test Summary ...............................................................................................................
4.1
Equipment ...........................................................................................................
4.2
Equipment and EVM Setup .......................................................................................
4.3
Test Procedure Using a Single Cell Li-Ion Battery ............................................................
4.4
Alternate Test Methods ...........................................................................................
Schematic, Physical Layouts and Bill of Materials .....................................................................
5.1
Schematic ...........................................................................................................
5.2
Physical Layouts ...................................................................................................
5.3
Bill of Materials .....................................................................................................
2
2
2
2
3
3
4
4
5
5
6
8
List of Figures
1
EVM Setup ................................................................................................................... 3
2
bq24090/1/2/3 EVM Board Schematic ................................................................................... 5
3
Assembly Layer ............................................................................................................. 6
4
Top Layer .................................................................................................................... 6
5
Bottom Layer
................................................................................................................
SLUU392A – December 2009 – Revised June 2010
1.0-A Single-Input, Single-Cell Li-Ion Battery Charger
Copyright © 2009–2010, Texas Instruments Incorporated
7
1
Introduction
1
www.ti.com
Introduction
The bq24090/1/2/3 series of devices are highly integrated Li-ion linear charger devices targeted at
space-limited portable applications. The devices operate from either a USB port or AC adapter.
The bq24090/1/2/3 has a single power output that charges the battery. A system load can be placed in
parallel with the battery as long as the average system load does not keep the battery from charging fully
during the 10 hour safety timer.
The battery is charged in three phases: conditioning, constant current, and constant voltage. In all charge
phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an
internal temperature threshold is exceeded.
The charger power stage and charge current sense functions are fully integrated. The charger function
has high-accuracy current and voltage regulation loops, charge status display, and charge termination.
The pre-charge current and termination current threshold are programmed via an external resistor on the
bq24090/1/2/3. The fast charge current value is also programmable via an external resistor.
2
Considerations With Evaluating the bq24090/1/2/3
Refer to the data sheet for specific details on the charger ICs. The main differences between the bq24090,
at 25° and bq24091 is that NTC thermistor valve is 10k for bq24090 and 100k for bq24091.
The ISET current control loop sets the maximum charge current. This maximum programmed current level
can be further reduced by entering a USB mode, selected by the ISET2 pin.
A system load may be connected to the OUT pin, which takes away some of the charge current. Normally
it is not recommended to operate the device in pre-charge since the system load keeps the battery from
recovering; but, since the PRE_TERM pin can program a higher pre-charge current this restriction is not
necessary.
3
Performance Specification Summary
Specification
Test Conditions
MIN
MAX
UNIT
Input DC voltage, Vin
Recommended input voltage range
4.45
6.45
V
3.5
28
V
1.5
W
0.8
A
Reduced Performance, Vin
Will not charge with Over Voltage input condition. Limited
charging with under voltage input.
Power Dissipation (2)
PDISS = (VIN – VOUT) × IOUT
IOUT
RISET = 1k
(1)
(2)
4
(1)
TYP
0.54
Input voltage range is specified for normal operation. Input voltage between UVLO and 4.75 V has limited functionality, but does
not damage the IC nor present any safety issue with the battery. Input voltage above OVP and less than 30 Vdc has no
operation and will not damage the IC. Lower input voltage (closer to dropout operation) produces less heat dissipation and
potentially better performance.
The junction temperature rise above ambient is proportional to the power dissipation. Once the junction temperature reaches
~125°C, thermal regulations reduces the programmed charge current.
Test Summary
The bq24090/1/2/3 EVM board requires a 5-VDC, 1-A power source to provide input power and a
single-cell Li-ion or Li-polymer battery pack. The test setup connections and jumper setting selections are
configured for a stand-alone evaluation; but, can be changed to interface with external hardware such as a
microcontroller.
2
1.0-A Single-Input, Single-Cell Li-Ion Battery Charger
SLUU392A – December 2009 – Revised June 2010
Copyright © 2009–2010, Texas Instruments Incorporated
Test Summary
www.ti.com
4.1
Equipment
•
•
•
•
4.2
Power supply +5.1 ±0.1 V, current limit set to 1.5 ±0.1 A
Battery: 4.2 V LiCoO2 or equivalent
Three Fluke 75 DMMs (equivalent or better)
Oscilloscope, Model TDS220 (equivalent or better)
Equipment and EVM Setup
Jack/Component
Connect or Adjustment To:
J1–DC+
Power supply positive, preset to 5 VDC, 1-A current limit.
J1–DC–
Power supply ground
J2–BAT+
Positive Battery Pack Terminal
J2–BAT–
Negative Battery Pack Terminal
JMP1
Apply shunt for Pre-TERM connection.
JMP2
Apply shunt for PG LED connection.
JMP3
Apply shunt for ISET2: ISET2-LO (pins 2-3) connection.
JMP4
Apply shunt for CHG LED connection.
JMP5
Apply shunt for TS connection.
R2 (RISET)
Adjust R2 for 1k between TP2 and GND
R3 (RPRE-TERM)
Adjust R4 for 2k between TP4 and GND
R11 ( RTS)
Adjust R11 for 10k between TP9 and GND
PS # 1
+ 5 V
bq24090/1
+
++
Figure 1. EVM Setup
SLUU392A – December 2009 – Revised June 2010
1.0-A Single-Input, Single-Cell Li-Ion Battery Charger
Copyright © 2009–2010, Texas Instruments Incorporated
3
Test Summary
4.3
www.ti.com
Test Procedure Using a Single Cell Li-Ion Battery
1. Verify that the setup is correct and turn on the power supply, which was preset to 5 VDC, and 1 A for
the current-limit setting.
2. The bq24090/1/2/3 enters preconditioning mode if the battery is below the V(LOWV) threshold. In this
mode, the bq24090/1/2/3 pre-charges the battery with a low current programmed by the PRE-TERM
resistor (typically set to 10% of fast charge) until the battery voltage reaches the V(LOWV) threshold or
until the pre-charge timer expires. If the timer expires, then the charge current is terminated and the
bq24090/1/2/3 enters fault mode. The CHG LED turns off when in timer fault mode. Toggling input
power, toggling TS (BAT_EN) or battery replacement resets fault mode.
3. When the battery voltage rises above the V(LOWV) threshold, the battery enters fast-charge constant
current mode. This EVM is programmed for 0.54 A of fast-charging current.
4. Remove the shunt from JMP3 and see the IC go into USB100 mode (charge current drops); place
shunt between ISET2 and HI and see the USB500 mode; return shunt to ISET2-GND for programmed
current.
5.
(a) For bq24090/1: Adjust R11 (TS potentiometer) clockwise until the cold fault threshold is reached
(VTS = ~1.4V); note that the charging stops, and the CHG LED STAYS on (for 1st charge only).
Adjust R11 until VTS ≈ 0.5; note that the charging has continued. Continue adjusting R11 until VTS
≈ 150 mV; note that charging has stopped due to a high temperature fault and the CHG LED
remains on during the first charge. Adjust R11 until VTS ≈ 0.5V.
(b) For bq24092/3: Adjust R11 (TS potentiometer) clockwise until the cold operation threshold is
reached (VTS = ~790mV); note that the fast charge current drops to have the amplitude, Continue
to adjust R11 until the cold fault threshold is reached (VTS = ~1.4V); note that the charging stops,
and the CHG LED STAYS on (for 1st charge only). Adjust R11 until VTS ≈ 0.5; note that the
charging has continued. Continue adjusting R11 until VTS ≈ 278 mV; note that in voltage regulation
mode the regulation voltage will be ~4.06V. Continue adjusting R11 until VTS ≈ 150 mV; note that
charging has stopped due to a high temperature fault and the CHG LED remains on during the first
charge. Adjust R11 until VTS ≈ 0.5V and verify that charging continues.
6. Once the battery reaches the voltage regulation threshold (4.2 V), the voltage control loop takes over
and the current tapers down as the battery reaches its full capacity.
7. The battery remains at the fast-charge mode until either the charge timer expires or the charge
termination current threshold is reached.
8. When the charge terminates, the CHG LED turns off.
9. Remove JMP5 (TS) and the charger turns on. This mode is Termination and Timer Disable Mode
(TTDM). This allows continuous power applied from the input to the output, regulated to 4.2V with a
maximum current programmed by the ISET resistor (can be restricted further if in USB mode). The
system can operate without a battery in this mode as long as the system does not exceed the supplied
input current.
10. If the battery discharges to the recharge threshold, the charger starts fast charging, but the CHG LED
will not come on for the subsequent charges. Cycling the input power, replacing the battery, or toggling
the TS pin low starts a new charge with the CHG LED on.
NOTE: Loads across the battery can affect termination. The pre-term pin can be adjusted to offset
the system current. See data sheet for more details.
4.4
Alternate Test Methods
A 4-quadrant power supply that can source and sink current can be used in place of the battery pack to
evaluate the charger. It allows each transfer between pre-charge, constant-current and constant voltage
fast charge. Keep leads short to avoid adding too much inductance which may cause an interaction
between the power supply and charger. A large capacitor across the output helps cancel the inductance if
long leads are necessary.
4
1.0-A Single-Input, Single-Cell Li-Ion Battery Charger
SLUU392A – December 2009 – Revised June 2010
Copyright © 2009–2010, Texas Instruments Incorporated
Schematic, Physical Layouts and Bill of Materials
www.ti.com
5
Schematic, Physical Layouts and Bill of Materials
5.1
Schematic
Figure 2. bq24090/1/2/3 EVM Board Schematic
SLUU392A – December 2009 – Revised June 2010
1.0-A Single-Input, Single-Cell Li-Ion Battery Charger
Copyright © 2009–2010, Texas Instruments Incorporated
5
Schematic, Physical Layouts and Bill of Materials
5.2
www.ti.com
Physical Layouts
Figure 3. Assembly Layer
Figure 4. Top Layer
6
1.0-A Single-Input, Single-Cell Li-Ion Battery Charger
SLUU392A – December 2009 – Revised June 2010
Copyright © 2009–2010, Texas Instruments Incorporated
Schematic, Physical Layouts and Bill of Materials
www.ti.com
Figure 5. Bottom Layer
SLUU392A – December 2009 – Revised June 2010
1.0-A Single-Input, Single-Cell Li-Ion Battery Charger
Copyright © 2009–2010, Texas Instruments Incorporated
7
Schematic, Physical Layouts and Bill of Materials
5.3
www.ti.com
Bill of Materials
Table 1. HPA506B Bill of Materials
-001
-002
-003
-004
RefDes
Value
Description
Size
Part Number
MFR
1
1
1
1
C1
1 µF
Capacitor, Ceramic, 25V, X5R, 10%
0603
ECJ-1VB1E105K
Panasonic
0
0
0
0
C2
Capacitor, Ceramic, 25V, X5R, 10%
0805
ECJ-2FB1E225K
Panasonic
1
1
1
1
C3
Capacitor, Ceramic, 10V, X5R, 10%
0603
ECJ-1VB1A225K
Panasonic
0
0
0
0
C4
Capacitor, Ceramic, 10V, X5R, 10%
0805
ECJ-2FB1A106K
Std
0
0
0
0
C5
Capacitor, Ceramic, 10V, X5R, 10%
0603
ECJ-1VB1A225K
Panasonic
2
2
2
2
D1, D2
LTST-C190GKT
Diode, LED, Green, 2.1-V, 20-mA, 6-mcd
0603
LTST-C190GKT
Lite On
0
0
0
0
D3
BZX84C5V6-7-F
Diode, Zener, 5.6-V, 350-mW
SOT-23
BZX84C5V6-7-F
Diodes
1
1
1
1
J1
ED555/2DS
Terminal Block, 2-pin, 6-A, 3.5mm
0.27 x 0.25 inch
ED555/2DS
OST
1
1
1
1
J2
ED555/4DS
Terminal Block, 4-pin, 6-A, 3.5mm
0.55 x 0.25 inch
ED555/4DS
OST
4
4
4
4
JMP1, JMP2,
JMP4, JMP5
PEC02SAAN
Header, Male 2-pin, 100mil spacing,
0.100 inch x 2
PEC02SAAN
Sullins
1
1
1
1
JMP3
PEC03SAAN
Header, Male 3-pin, 100mil spacing,
0.100 inch x 3
PEC03SAAN
Sullins
1
1
1
1
R1
665
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
0
1
0
R11
50k
Potentiometer, 3/8 Cermet, Single-Turn
0.25x0.17 inch
3266W-503-LF
Bourns
0
1
0
1
R11
500k
Potentiometer, 3/8 Cermet, Single-Turn
0.25x0.17 inch
3266W-504-LF
Bourns
2
2
2
2
R2, R4
10k
Potentiometer, 3/8 Cermet, Single-Turn
0.25x0.17 inch
3266W-103-LF
Bourns
2
2
2
2
R3, R12
1.0k
Resistor, Chip, 1/16W, 1%
0603
Std
Std
2
2
2
2
R5, R9
1.5k
Resistor, Chip, 1/16W, 1%
0603
Std
Std
0
0
0
0
R6, R13, R14
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
1
1
1
R7
10k
Resistor, Chip, 1/16W, 1%
0603
Std
Std
2
2
2
2
R8, R10
0
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
0
0
0
U1
BQ24090DGQ
IC, 800mA, Single-Input, Single Cell Li-Ion BATTERY
CHARGER
HTSSOP
BQ24090DGQ
TI
0
1
0
0
U1
BQ24091DGQ
IC, 800mA, Single-Input, Single Cell Li-Ion BATTERY
CHARGER
HTSSOP
BQ24091DGQ
TI
0
0
1
0
U1
BQ24092DGQ
IC, 800mA, Single-Input, Single Cell Li-Ion BATTERY
CHARGER
HTSSOP
BQ24092DGQ
TI
0
0
0
1
U1
BQ24093DGQ
IC, 800mA, Single-Input, Single Cell Li-Ion BATTERY
CHARGER
HTSSOP
BQ24093DGQ
TI
5
5
5
5
Shunt (Note 5)
Shunt, 100-mil, Black
0.1
929950-00
3M
1
1
1
1
–
PCB, 3 In x 1.85 In x 0.0031 In
HPA506
Any
2.2 µF
Notes: 1. These assemblies are ESD sensitive, ESD precautions shall be observed.
2. These assemblies must be clean and free from flux and all contaminants. Use of no clean flux is not acceptable.
3. These assemblies must comply with workmanship standards IPC-A-610 Class 2.
4. Ref designators marked with an asterisk ('**') cannot be substituted. All other components can be substituted with equivalent MFG's components.
5. Apply shunt to JMP1/2/4/5 and JMP3:2/3.
8
1.0-A Single-Input, Single-Cell Li-Ion Battery Charger
SLUU392A – December 2009 – Revised June 2010
Copyright © 2009–2010, Texas Instruments Incorporated
EVALUATION BOARD/KIT IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES
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EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the power supply voltage range of 4.45 V and 6.45 V. Input voltage range is specified for normal
operation. Input voltage between UVLO and 4.75 V has limited functionality, but does not damage the IC nor present any safety issue with
the battery. Input voltage above OVP and less than 30 Vdc has no operation and will not damage the IC. Lower input voltage (closer to
dropout operation) produces less heat dissipation and potentially better performance.
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions
concerning the input range, please contact a TI field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM.
Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than 60°C. The EVM is designed to operate
properly with certain components above 60°C as long as the input and output ranges are maintained. These components include but are
not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified
using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation,
please be aware that these devices may be very warm to the touch.
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