Texas Instruments Battery Charger BQ24351EVM User Manual

User's Guide  
SLUU455October 2010  
bq24351EVM for Li-Ion Charger Front-End Protection IC  
This user's guide describes the features, setup, and operation of the bq24351EVM evaluation module.  
Included are the bill of materials, board layout, and schematic.  
Contents  
1
2
Introduction .................................................................................................................. 2  
1.1  
1.2  
1.3  
1.4  
1.5  
General Description ................................................................................................ 2  
EVM Features ...................................................................................................... 2  
I/O Description ...................................................................................................... 2  
Controls and Key Parameters Setting ........................................................................... 3  
Recommended Operating Conditions ........................................................................... 3  
Test Summary ............................................................................................................... 3  
2.1  
2.2  
2.3  
2.4  
Definitions ........................................................................................................... 3  
Equipment ........................................................................................................... 3  
Equipment Setup ................................................................................................... 4  
Procedure ........................................................................................................... 5  
3
4
PCB Layout Guideline ...................................................................................................... 5  
Bill of Materials, Board Layout, and Schematic ......................................................................... 6  
4.1  
4.2  
4.3  
Bill of Materials ..................................................................................................... 6  
Board Layout ....................................................................................................... 7  
Schematic ......................................................................................................... 11  
List of Figures  
1
2
3
4
5
6
Original Test Setup for HPA666 (bq24351 DSG EVM) ................................................................  
Top Layer ....................................................................................................................  
Bottom Layer ................................................................................................................  
Top Silk Screen .............................................................................................................  
Top Assembly.............................................................................................................. 10  
bq24351 Schematic ....................................................................................................... 11  
List of Tables  
1
Bill of Materials ..............................................................................................................  
1
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bq24351EVM for Li-Ion Charger Front-End Protection IC  
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Test Summary  
1.4 Controls and Key Parameters Setting  
(1)  
Jack  
JP1  
JP2  
JP3  
JP4  
JP5  
JP6  
JP7  
Description  
Factory Setting  
Jumper on  
If on, high-side sensing resistor is disabled  
Reserved for other ICs  
Jumper (BATEN, GND) on  
Jumper off  
bq24351 GATDRV pin  
bq2057C BAT pin connection to bq24351  
bq2057C VCC pin connection to bq24351  
bq2057C CC pin connection to bq24351  
If on, low-side current-sensing resistor is disabled  
Jumper on  
Jumper on  
Jumper on  
Jumper off  
(1)  
Short JP1, JP4, JP5, and JP6, and disconnect JP7 to use onboard bq2057C as charger; to use external charger to control  
bq24351, disconnect JP1, JP4, JP5, and JP6 and short JP7.  
1.5 Recommended Operating Conditions  
Symbol  
Description  
MIN  
4.5  
0
TYP  
5
MAX  
26  
Unit  
V
Supply voltage, VIN  
Input voltage from ac adapter input  
Voltage applied at VBAT terminal of J4  
Maximum input current from ac adapter input  
Battery charge current  
Battery voltage, VBAT  
Supply current, IAC  
3–4.2  
5
V
0
1.5  
1
A
Charge current, Ichrg  
Operating junction temperature range, TJ  
0.05  
0
0.56  
A
125  
°C  
2
Test Summary  
2.1 Definitions  
This procedure details how to configure the evaluation board. On the test procedure, the following naming  
conventions are followed. See the schematic for details.  
VXXX  
External voltage supply name (VIN, VBAT, VOUT)  
External load name (LOADR, LOADI)  
LOADW  
V(TPyyy)  
Voltage at internal test point TPyyy. For example, V(TP1) means the voltage at  
TP1.  
V(Jxx):  
Voltage at jack terminal Jxx.  
V(TP(XXXXX))  
Voltage at test point XXXXX. For example, V(ACDET) means the voltage at the  
test point which is marked as ACDET.  
V(XXX, YYY)  
I(JXX(YYY))  
Jxx(BBB)  
Voltage across points XXX and YYY.  
Current going out from the YYY terminal of jack XX.  
Terminal or pin BBB of jack xx  
Jxx ON  
Internal jumper Jxx terminals are shorted  
Internal jumper Jxx terminals are open  
Jxx OFF  
Jxx (-YY-) ON  
Measure A,B  
Internal jumper Jxx adjacent terminals marked as YY are shorted  
Check specified parameters A, B. If measured values are not within specified  
limits, the unit under test has failed.  
Observe A,B  
Observe if A, B occur. If they do not occur, the unit under test has failed.  
Assembly drawings show locations for jumpers, test points, and individual components.  
2.2 Equipment  
2.2.1  
Power Supplies  
Power supply 1 (PS 1): a power supply capable of supplying 15 V at 2 A is required.  
3
SLUU455October 2010  
bq24351EVM for Li-Ion Charger Front-End Protection IC  
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Test Summary  
2.2.2  
2.2.3  
2.2.4  
Load 1  
A 10-V (or above), 2-A (or above) electronic load that can operate in constant-current mode.  
Load 2  
A 10-V (or above), 2-A (or above) electronic load that can operate in constant-voltage mode.  
Meters  
Four Fluke 75 multimeters (equivalent or better)  
Or:  
Three equivalent voltage meters and one equivalent current meter  
The current meter must be capable of measuring 2-A+ current.  
2.2.5  
Wire Gauge  
All wires connected to the EVM input power supply and output load must be at least AWG 22. The  
maximum current is up to 1 A.  
2.3 Equipment Setup  
1. Set PS 1 for 0 V ±100 mVdc, 2 ± 0.1 A current limit, and then disable the output.  
2. Connect the output of PS 1 to J1 (DC+, DC–).  
3. Connect a voltage meter across J1 (DC+, DC–).  
4. Connect the output of load 1 in series with a current meter (multimeter) to J2 (CHGIN) and J3 (GND).  
Turn on the power of load 1. Set the load current to 1.5 A ±50 mA, but disable the output.  
5. Connect the output of load 2 in series with a current meter (multimeter) to J4 (BAT+, BAT–).  
6. Connect a voltage meter across J4 (BAT+, BAT–).  
7. Set the voltage of load 2 to 3.6 V ±0.1 V, and disable output of load 2.  
8. JP1: ON, JP2 (BATEN, GND): ON, JP3: OFF, JP4: ON, JP5: ON, JP6: ON, JP7: OFF.  
After the preceding steps have been taken, the test setup for HPA666 (bq24351 DSG EVM) appears as is  
shown in Figure 1.  
HPA666 bq24351EVM  
JP7  
J1  
J4  
JP1  
V
V
Supply 1  
2
BAT+  
DC+  
U1  
I
Ibat  
CFET APPLICATION  
CIRCUIT  
JP4  
JP6 JP5  
JP3 JP2  
U2  
J2  
J3  
Load  
1
I
I
Figure 1. Original Test Setup for HPA666 (bq24351 DSG EVM)  
4
bq24351EVM for Li-Ion Charger Front-End Protection IC  
SLUU455October 2010  
Copyright © 2010, Texas Instruments Incorporated  
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PCB Layout Guideline  
2.4 Procedure  
2.4.1  
Charger Current and Voltage Regulation  
1. Ensure that steps in Section 2.3 are followed.  
2. Enable output of PS 1.  
3. Increase the output voltage of PS 1 to 5 V ±0.1 V.  
4. Enable the output of load 2.  
Measure V(J2(OUT)) = 3.6 V ±200 mV  
Measure Ibat = 560 mA ±70 mA  
Observe D2 on, D3 on, D6 off, D7 on.  
2.4.2  
2.4.3  
CFET Input Overvoltage Protection  
1. Increase the voltage of PS 1 to 11 V ±0.1 V.  
Observe D2 on, D3 off, D6 off, D7 off.  
2. Decrease the voltage of PS 1 to 5 V ±0.1 V.  
Observe D2 on, D3 on, D6 off, D7 on.  
CFET Load Overcurrent Protection  
1. Enable the output of load 1.  
Observe D2 on, D3 off, D6 off, D7 off.  
2. Disable the output of load 1.  
Observe D2 on, D3 on, D6 off, D7 on.  
3. Decrease the voltage of PS 1 to 0 V ±0.1 V.  
3
PCB Layout Guideline  
1. It is critical that the exposed thermal pad on the back side of the bq24351 package be soldered to the  
printed-circuit board (PCB) ground. Ensure that sufficient thermal vias are located underneath the IC,  
connecting to the ground plane on the other layers.  
2. The high-current charge paths into ACIN and from the CHGIN and OUT pins must be sized  
appropriately for the maximum charge current in order to avoid excessive voltage drops in these  
traces.  
3. Decoupling capacitors for ACIN and CHGIN must be placed to make the interconnections to the IC as  
short as possible.  
4. Resistors for VBAT pin must be placed close to the corresponding IC pins and make the  
interconnections to the IC as short as possible.  
5
SLUU455October 2010  
bq24351EVM for Li-Ion Charger Front-End Protection IC  
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Bill of Materials, Board Layout, and Schematic  
4
Bill of Materials, Board Layout, and Schematic  
4.1 Bill of Materials  
Table 1. Bill of Materials  
bq24351 RefDes  
Value  
Description  
Size  
603  
603  
805  
603  
Part Number  
MFR  
Std  
Std  
Std  
Std  
1
3
1
1
1
C1  
1 µF  
1 µF  
Capacitor, ceramic, 35-V, X5R, 10%  
Capacitor, ceramic, 10-V, X7R, 10%  
Capacitor, ceramic, 16-V, X7R, 10%  
Capacitor, ceramic, 10-V, X7R, 10%  
Capacitor, electrolytic, 25-V, 20%  
Std  
Std  
Std  
Std  
C2, C3, C5  
C4  
C6  
C7  
0.1 µF  
0.1 µF  
220 µF  
0.327 inch × 0.327  
inch (8.3 mm × 8.3  
mm)  
UUD1E221MNL1GS Nichicon  
1
3
2
1
D1  
BZT52C6V8S  
Green  
Diode, zener, 200-mW, 6.8-V  
SOD-323  
603  
BZT52C6V8S  
LTST-C190GKT  
LTST-C190CKT  
BAT54C  
General  
LITE-ON  
Lite-On  
D2, D3, D6  
D4, D7  
D5  
Diode, LED, green, 2.1-V, 20-mA, 6-mcd  
Diode, LED, red, 2.1-V, 20-mA, 6-mcd  
Diode, dual Schottky, 200-mA, 30-V  
Red  
603  
BAT54C  
SOT23  
Vishay/LITE-  
ON  
2
2
J1, J4  
J2, J3  
ED1514/2DS  
ED1516/4DS  
Terminal block, 2-pin, 6-A, 3.5-mm  
Terminal block, 4-pin, 6-A, 3.5-mm  
Header, 2-pin, 100-mil (2.54-mm) spacing  
0.27 inch × 0.25  
inch (6.86 mm ×  
6.35 mm)  
ED1514/2DS  
ED1516/4DS  
OST  
0.55 inch × 0.25  
inch (14 mm × 6.35  
mm)  
OST  
5
2
5
JP1, JP4, JP5, PEC02SAAN  
JP6, JP7  
0.100 inch (2.54  
mm) × 2  
PEC02SAAN  
PTC03SAAN  
929950-00  
Sullins  
Sullins  
3M/ESD  
JP2, JP3  
PTC03SAAN  
Header, male 3-pin, 100-mil (2.54-mm) spacing,  
(36-pin strip)  
0.100 inch (2.54  
mm) × 3  
929950-00  
Shorting jumpers, 2-pin, 100-mil (2.54-mm)  
spacing  
2
0
2
2
2
1
1
1
1
4
R1, R2  
R3, R4  
R5, R6  
R7, R8  
R9, R10  
R11  
0
Resistor, chip, 1/16-W, 1%  
Resistor, chip, 1/16-W, 1%  
Resistor, chip, 1/16-W, 5%  
Resistor, chip, 1/16-W, 5%  
Resistor, metal film, 1/4-W, 1%  
Resistor, chip, 1/16-W, 5%  
Resistor, chip, 1/16-W, 5%  
Resistor, chip, 1/16-W, 5%  
Resistor, chip, 1/16-W, 5%  
Resistor, chip, 1/16-W, 5%  
402  
402  
402  
603  
1206  
603  
603  
603  
603  
603  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
0
200 kΩ  
200 kΩ  
0.2 Ω  
20 kΩ  
100 kΩ  
100 Ω  
6.2 kΩ  
R12  
R13  
R14  
R15, R16, R17, 1.5 kΩ  
R18  
1
4
R19  
51 Ω  
Resistor, chip, 1/16-W, 5%  
6-32 NYL nuts  
603  
Std  
Std  
NY HN 632  
H620-ND  
Building  
Fasteners  
4
8
ST1, ST2, ST3, 4816  
ST4  
Standoff, M/F, hex 6-32 NYL, 0.500 inch (12.7  
mm)  
sf_thvt_325_rnd  
4816  
5002  
Keystone  
TP1, TP2, TP3, White  
TP4, TP5, TP6,  
TP7, TP8  
Test point, white, thru hole, color-keyed  
0.100 × 0.100 inch  
(2.54 mm × 2.54  
mm)  
Keystone  
1
TP9  
White  
Test point, white, thru hole, color-keyed  
0.100 × 0.100 inch  
(2.54 mm × 2.54  
mm)  
5001  
Keystone  
1
1
U1  
U2  
bq24351DSG  
bq2057CSN  
IC, overvoltage and overcurrent charger front-end SON-8  
bq24351DSG  
bq2057CSN  
TI  
TI  
IC, charge management, one- or two-cell Li-Ion  
or Li-Pol charger  
SOIC(SN)  
1
HPA666  
PCB, 2.8-inch × 2.8-inch × 0.062-inch (7.11-cm ×  
7.11-cm × 1.58-mm)  
PCB  
Any  
Notes: 1. Number 0 in left side columns means do not use this component.  
2. Std in part number column means standard manufacturer’s part number.  
6
bq24351EVM for Li-Ion Charger Front-End Protection IC  
SLUU455October 2010  
Copyright © 2010, Texas Instruments Incorporated  
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Bill of Materials, Board Layout, and Schematic  
4.2 Board Layout  
C001  
Figure 2. Top Layer  
7
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bq24351EVM for Li-Ion Charger Front-End Protection IC  
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Bill of Materials, Board Layout, and Schematic  
C002  
Figure 3. Bottom Layer  
8
bq24351EVM for Li-Ion Charger Front-End Protection IC  
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Bill of Materials, Board Layout, and Schematic  
C003  
Figure 4. Top Silk Screen  
9
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bq24351EVM for Li-Ion Charger Front-End Protection IC  
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Bill of Materials, Board Layout, and Schematic  
C004  
Figure 5. Top Assembly  
10  
bq24351EVM for Li-Ion Charger Front-End Protection IC  
SLUU455October 2010  
Copyright © 2010, Texas Instruments Incorporated  
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Bill of Materials, Board Layout, and Schematic  
4.3 Schematic  
Figure 6. bq24351 Schematic  
11  
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bq24351EVM for Li-Ion Charger Front-End Protection IC  
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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 input voltage range of 4.5 V to 26 V and the output voltage range of 0 V to 4.2 V .  
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 70°C. The EVM is designed to  
operate properly with certain components above 125°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.  
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265  
Copyright © 2010, Texas Instruments Incorporated  
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TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard  
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mandated by government requirements, testing of all parameters of each product is not necessarily performed.  
TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and  
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