User's Guide
SLUU455–October 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
SLUU455–October 2010
bq24351EVM for Li-Ion Charger Front-End Protection IC
Copyright © 2010, Texas Instruments Incorporated
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
SLUU455–October 2010
bq24351EVM for Li-Ion Charger Front-End Protection IC
Copyright © 2010, Texas Instruments Incorporated
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
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
SLUU455–October 2010
Copyright © 2010, Texas Instruments Incorporated
PCB Layout Guideline
2.4 Procedure
2.4.1
Charger Current and Voltage Regulation
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
SLUU455–October 2010
bq24351EVM for Li-Ion Charger Front-End Protection IC
Copyright © 2010, Texas Instruments Incorporated
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
SLUU455–October 2010
Copyright © 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 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
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including product safety and environmental measures typically found in end products that incorporate such semiconductor
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electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the
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Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30
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This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
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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
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During normal operation, some circuit components may have case temperatures greater than 70°C. The EVM is designed to
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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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