User's Guide
SLUU378 – September 2009
0.8-A, Single-Input, Single-Cell Li-Ion Battery Charger
This user’s guide describes the bq24050/2/5 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 800mA of
continuous current to the battery output when programmed with a resistor on the ISET pin and is
programmed for ~540mA at the factory. 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 .................................................................................................................. 2
Considerations With Evaluating the bq24050/2/5 ...................................................................... 2
Performance Specification Summary ..................................................................................... 2
Test Summary ............................................................................................................... 2
4.1
Equipment ........................................................................................................... 3
4.2
Equipment and EVM Setup ....................................................................................... 3
4.3
Test Procedure Using a Single Cell Li-Ion Battery ............................................................ 3
4.4
Alternate Test Methods ........................................................................................... 4
Schematics, Physical Layouts, and Bill of Materials ................................................................... 5
5.1
Schematics – HPA388A ........................................................................................... 5
5.2
Physical Layouts – HPA388A .................................................................................... 6
5.3
Bill of Materials – HPA388A ...................................................................................... 7
5.4
Schematics – HPA379A ........................................................................................... 9
5.5
Physical Layouts – HPA379A ................................................................................... 10
5.6
Bill of Materials – HPA379A ..................................................................................... 11
List of Figures
1
bq24050/2/5 Setup Schematic ............................................................................................ 3
2
bq24050/2 EVM Schematic ................................................................................................ 6
3
Top Assembly ............................................................................................................... 6
4
Top View ..................................................................................................................... 7
5
Bottom View ................................................................................................................. 7
6
bq24055 EVM Schematic .................................................................................................. 9
7
Top Assembly .............................................................................................................. 10
8
Top View .................................................................................................................... 11
9
Bottom View ................................................................................................................ 11
List of Tables
1
HPA388A BOM – bq24050/2 .............................................................................................. 7
2
HPA379A BOM – bq24055............................................................................................... 11
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1
Introduction
1
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Introduction
The bq2405x series of devices are highly integrated Li-ion linear chargers devices targeted at
space-limited portable applications. The devices operate from either a USB port or AC adapter.
The bq2405x 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 bq24050/2/5 have an integrated USB detect routine that looks for an USB connection on power-up
and initially sets the charge input control to either the programmed ISET level, if an adaptor is detected, or
to USB100 mode if an USB port is detected. This aides in a faster charge if the battery is discharged and
the USB device transceiver is not powered and an adaptor is connected.
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
bq24050/2/5. The fast charge current value is also programmable via an external resistor
2
Considerations With Evaluating the bq24050/2/5
Refer to the data sheet for specific details on the charger ICs. The main differences between the
bq24050/2/5 spins is: (1) The '50 uses a 10k NTC thermistor, (2) the '52 uses a 100k NTC thermistor, and
(3) the '55 uses a 10k NTC thermistor and has a PG pin.
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 will take away some of the charge current.
Normally it is not recommended to operate the system in pre-charge mode 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
(1)
(2)
4
Performance Specification Summary
Specificaton
Test Conditions
Min
Input DC voltage, Vin
Recommended input voltage range
Reduced Performance, Vin (1)
Will not charge with Over Voltage input condition. Limited
charging with under voltage input.
Power Dissipation (2)
PDISS = (VIN – VOUT) × IOUT
IOUT
RISET = 1k
Typ
Max
Units
4.45
6.45
V
3.5
28
V
1.5
W
0.8
A
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 bq24050/2/5 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
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Test Summary
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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
Two 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 between IN_IC and DC+; allows use of J1 input.
JMP2
Apply shunt for Pre-Term connection.
JMP3
Remove shunt for USB100 mode operation.
JMP4
Apply shunt for CHG LED connection.
JMP5
Apply shunt for TS potentiometer connection.
JMP6 (bq24050/2)
Apply shunt to simulate an adaptor connection when using J1 as an input.
JMP6 (bq24055)
Apply shunt for PG LED connection.
JMP7 (bq24055)
Apply shunt to simulate an adaptor connection when using J1 as an input.
R2 (RISET)
Adjust R2 for 1k between TP2 and GND
R4 (RPRE-TERM)
Adjust R3 for 2k between TP4 and GND
R8 ( RTS)
Adjust R11 for 10k between TP9 and GND
Figure 1. bq24050/2/5 Setup Schematic
4.3
Test Procedure Using a Single Cell Li-Ion Battery
1. Connect one DMM across the BAT+ to BAT– connection at J2. Since this is a linear charger the output
current display on the input power supply is approximately the current delivered to the OUT pin. The
charge current may be monitored independently by placing a 100mΩ resistor in the battery pack return
and using a DMM to monitor the sense resistor.
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Test Summary
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2. Verify that the setup was performed correctly and turn on the power supply, which was preset to 5
VDC, and 1 A for the current-limit setting. The current was programmed for ~540 mA fast charge, or
~108 mA if in pre-charge, from the factory.
3. Shunt JMP6 (bq24050/2) and JMP7 (bq24055) short the D+ and D– input together simulating an
adaptor connection. After applying input power the USB detection routine will detect an adaptor and
start charging as if an adaptor is applied. One will notice about 540ma once the battery voltage
charges above the V(LOWV) threshold. The ISET2 pin voltage is proportional to the amount of
programmed current delivered to the OUT pin. The voltage on the ISET2 pin is 1.5V when the output
current is 100% of the programmed value.
4. The bq24050/2/5 enters preconditioning mode if the battery is below the V(LOWV) threshold. In this
mode, the bq24050/2/5 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
bq24050/2/5 enters fault mode. The CHG LED turns off when in timer fault mode (Toggling input
power, toggling TS low or battery replacement resets fault mode).
5. Once the battery voltage is above the V(LOWV) threshold, the battery enters fast-charge constant
current mode. This EVM is programmed, by the ISET resistor for 0.54 A of fast-charging current. The
IC should be in this mode since the USB detection routine detected an adaptor.
6. Apply a shunt to JMP3 ISET2-HI and see (charge current drops) the IC go into USB500 mode, remove
the shunt and see the mode change to USB100, place the shunt between ISET2 and GND to see the
programmed current mode. The USB detection routine always sets the mode at power-up and the user
(processor) has to change the state of the ISET2 pin for the IC to unlatch the charge mode and set
according to the ISET2 pin.
7. 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.
8. The battery remains at the fast charge mode until either the charge timer expires or the charge
termination current threshold is reached.
9. Once the charge terminates, the CHG LED will turn off.
10. Remove JMP5 (TS) and the charger will turn 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 (may 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.
11. If the battery discharges to the recharge threshold, the charger starts fast charging, but the CHG LED
will not come on for the subsequent chargers. Cycling the input power, replacing the battery, or
toggling the TS pin low will start a new charge with the CHG LED on.
12. Discharge the battery below 4.0 V and above 3.0 V, remove Shunt 6 (bq24050/2) or Shunt 7
(bq24055). Remove and re-apply input power and verify the USB mode is detected. Remove shunt
from JMP3 and replace on JMP3: ISET2-GND. Verify current is set to the ISET resistor programmed
level.
13. Procedure may be repeated using a mini USB cable connected to J3 on the EVM, and to either a USB
port or adapter for the power source. Remove shunt JMP6 (bq24050/2) or JMP7 (bq24055), and move
JMP1 to IN_IC / USB +5V prior to applying power with the USB mini cable.
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 which can source and sink current can be used in place of the battery pack to
evaluate the charger. It will allow each transfer between pre-charge, constant-current and constant voltage
fast charge. Keep leads short to avoid adding too much inductance which make cause an interaction
between the power supply and charger. A large capacitor across the output will help cancel the inductance
if long leads are necessary.
4
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Copyright © 2009, Texas Instruments Incorporated
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Schematics, Physical Layouts, and Bill of Materials
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5
Schematics, Physical Layouts, and Bill of Materials
5.1
Schematics – HPA388A
Figure 2. bq24050/2 EVM Schematic
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Schematics, Physical Layouts, and Bill of Materials
5.2
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Physical Layouts – HPA388A
Figure 3. Top Assembly
Figure 4. Top View
6
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Schematics, Physical Layouts, and Bill of Materials
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Figure 5. Bottom View
5.3
Bill of Materials – HPA388A
Table 1. HPA388A BOM – bq24050/2
-001
-002
RefDes
Value
Description
Size
Part Number
MFR
1
1
C1
1µF
Capacitor, Ceramic, 25V, X5R, 10%
0603
ECJ-1VB1E105K
Panasonic
0
0
C2
Optional
Capacitor, Ceramic, 25V, X5R, 10%
0805
ECJ-2FB1E***K
Panasonic
1
1
C3
2.2μF
Capacitor, Ceramic, 10V, X5R, 10%
0603
ECJ-1VB1A225K
Panasonic
0
0
C4
Optional
Capacitor, Ceramic, 10V, X5R, 10%
0805
ECJ-2FB1A***K
Panasonic
0
0
C5
Optional
Capacitor, Ceramic, 25V, X5R, 10%
0603
ECJ-1VB1E224K
Std
1
1
D1
LTST-C190GKT
Diode, LED, Green, 2.1-V, 20-mA, 6-mcd
0603
LTST-C190GKT
Lite On
0
0
D2
CM1213A-02SR
Diode, ESD Protection Arrays, 2 Channel
SOT143
CM1213A-02SR
CMD
1
1
J1*
ED555/2DS
Terminal Block, 2-pin, 6-A, 3.5mm
0.27 × 0.25 inch
ED555/2DS
OST
1
1
J2*
ED555/4DS
Terminal Block, 4-pin, 6-A, 3.5mm
0.55 × 0.25 inch
ED555/4DS
OST
1
1
J3
UX60-MB-5ST
Connector, Recpt, USB-B, Mini, 5-pins, SMT
0.354 × 0.303
Inches
UX60-MB-5ST
2
2
JMP1, JMP3
PEC03SAAN
Header, Male 3-pin, 100mil spacing
0.100 inch × 3
PEC03SAAN
Sullins
4
4
JMP2, JMP4,
JMP5, JMP6
PTC02SAAN
Header, Male 2-pin, 100mil spacing
0.100 inch × 2
PEC02SAAN
Sullins
1
1
R1
680
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
1
R10
0
Resistor, Chip, 1/16W, 1%
0603
Std
Std
0
0
R11, R12
DNI
Resistor, Chip, 1/16W, 1%
0603
Std
Std
2
2
R2, R4
10kΩ
Potentiometer, 1/4 in. Cermet, 12-Turn,
Top-Adjust
0.25×0.17
3266W-103LF
Bourns
2
2
R3, R9
1.0kΩ
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
1
R5
10kΩ
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
1
R6
200Ω
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
1
R7
1.5kΩ
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
0
R8
50kΩ
Potentiometer, 1/4 in. Cermet, 12-Turn,
Top-Adjust
0.25×0.17
3266W-503LF
Bourns
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Schematics, Physical Layouts, and Bill of Materials
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Table 1. HPA388A BOM – bq24050/2 (continued)
-001
-002
RefDes
Value
Description
Size
Part Number
MFR
0
1
R8
500kΩ
Potentiometer, 1/4 in. Cermet, 12-Turn,
Top-Adjust
0.25×0.17
3266W-504LF
Bourns
1
0
U1
BQ24050DSQ
IC, 750mA, Single-Input, Single Cell Li-Ion
BATTERY CHARGER
SON-10
BQ24050DSQ
TI
0
1
U1
BQ24052DSQ
IC, 750mA, Single-Input, Single Cell Li-Ion
BATTERY CHARGER
SON-10
BQ24052DSQ
TI
6
6
Shunt
(Note 5)
Shunt, 100-mil, Black
0.1
929950-00
3M
–
PCB, 2.45 In × 1.85 In × 0.031 In
HPA388
Any
1
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 JMP2/4/5/6 and JMP1:1/2 and JMP3:2/3.
8
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5.4
Schematics, Physical Layouts, and Bill of Materials
Schematics – HPA379A
Figure 6. bq24055 EVM Schematic
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Schematics, Physical Layouts, and Bill of Materials
5.5
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Physical Layouts – HPA379A
Figure 7. Top Assembly
Figure 8. Top View
10
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Figure 9. Bottom View
5.6
Bill of Materials – HPA379A
Table 2. HPA379A BOM – bq24055
Count
RefDes
Value
Description
Size
Part Number
1
C1
1μF
Capacitor, Ceramic, 25V, X5R, 10%
0603
ECJ-1VB1E105K Panasonic
0
C2
Capacitor, Ceramic, 25V, X5R, 10%
0805
1
C3
Capacitor, Ceramic, 10V, X5R, 10%
0603
0
C4
Capacitor, Ceramic, 10V, X5R, 10%
0805
0
C5
Capacitor, Ceramic, 10V, X5R, 10%
0603
2
D1, D2
LTSTC190GKT
Diode, LED, Green, 2.1-V, 20-mA, 6-mcd
0603
LTST-C190GKT
Lite On
0
D3
CM1213A02SR
Diode, ESD Protection Arrays, 2 Channel
SOT143
CM1213A-02SR
CMD
1
J1**
ED555/2DS
Terminal Block, 2-pin, 6-A, 3.5mm
0.27 x 0.25 inch
ED555/2DS
OST
1
J2**
ED555/4DS
Terminal Block, 4-pin, 6-A, 3.5mm
0.55 x 0.25 inch
ED555/4DS
OST
1
J3
UX60-MB-5ST
Connector, Recpt, USB-B, Mini, 5-pins, SMT
0.354 X 0.303
Inches
UX60-MB-5ST
Hirose Electric Co Ltd
2
JMP1,
JMP3
PEC03SAAN
Header, Male 3-pin, 100mil spacing, (3-pin
strip)
0.100 inch x 3
PEC03SAAN
Sullins
5
JMP2,
JMP4,
JMP5,
JMP6,
JMP7
PEC02SAAN
Header, Male 2-pin, 100mil spacing, (2-pin
strip)
0.100 inch x 2
PEC02SAAN
Sullins
1
R1
675Ω
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
R11
0
Resistor, Chip, 1/16W, 1%
0603
Std
Std
0
R12, R13
DNI
Resistor, Chip, 1/16W, 1%
0603
Std
Std
2
R2, R4
10kΩ
Potentiometer, 1/4 in. Cermet, 12-Turn,
Top-Adjust
0.25x0.17
3266W-1-103LF
Bourns
2
R3, R9
1.0kΩ
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
R5
10kΩ
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
R6
200Ω
Resistor, Chip, 1/16W, 1%
0603
Std
Std
2
R7, R10
1.5kΩ
Resistor, Chip, 1/16W, 1%
0603
Std
Std
2.2μF
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ECJ-1VB1A225K Panasonic
0.8-A, Single-Input, Single-Cell Li-Ion Battery Charger
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Schematics, Physical Layouts, and Bill of Materials
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Table 2. HPA379A BOM – bq24055 (continued)
Count
RefDes
Value
Description
Size
Part Number
MFR
1
R8
50kΩ
Potentiometer, 1/4 in. Cermet, 12-Turn,
Top-Adjust
0.25x0.17
3266W-1-503LF
Bourns
1
U1
BQ24055
IC, 800mA, Single-Input, Single Cell Li-Ion
BATTERY CHARGER with Automatic AC/USB
Detection
SON-12
BQ24055DSS
TI
929950-00
Shunts
100 mill
Black
3M
HPA379
Any
6
1
--
PCB, 2.4 In x 1.9 In x 0.031 In
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:DC+/IN_IC; JMP2:GND/PreTerm; JMP3:GND/ISET2; JMP4:LED/CHG; JMP5:GND/TS; JMP6:LED/PG
12
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Important Notices
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
ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have
electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental
measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does
not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling
(WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.
Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from
the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER
AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY
INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or
services described herein.
Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. This
notice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/or
safety programs, please contact the TI application engineer or visit www.ti.com/esh.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or
combination in which such TI products or services might be or are used.
FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES
ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radio
frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are
designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may
cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may
be required to correct this interference.
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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Copyright © 2009, Texas Instruments Incorporated
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