Texas Instruments bq24735 User manual

User's Guide
SLUU507A–June 2011–Revised September 2011
bq24735/725A Battery Charger Evaluation Module
This user's guide describes the features and operation of the bq24725A/735EVM Evaluation Module.
Contents
1 Introduction .................................................................................................................. 2
1.1 EVM Features ...................................................................................................... 2
1.2 General Description ................................................................................................ 2
1.3 Input/Output Jack Description .................................................................................... 2
1.4 Control and Key Parameters Setting ............................................................................ 3
1.5 Recommended Operating Conditions ........................................................................... 3
2 Test Summary ............................................................................................................... 3
2.1 Definitions ........................................................................................................... 3
2.2 Equipment ........................................................................................................... 3
2.3 Equipment Setup ................................................................................................... 4
2.4 Procedure ........................................................................................................... 6
3 Printed-Circuit-Board Layout Guideline .................................................................................. 8
4 Bill of Materials, Board Layout, and Schematics ...................................................................... 10
4.1 Board Layouts ..................................................................................................... 12
4.2 Schematics ........................................................................................................ 18
List of Figures
1 EV2300 Kit Connections................................................................................................... 5
2 Original Test Setup for HPA710 .......................................................................................... 5
3 Main Window of bq24725A/735 Evaluation Software.................................................................. 6
4 Test Setup for HPA710..................................................................................................... 7
5 Top Assembly.............................................................................................................. 12
6 Top Layer................................................................................................................... 13
7 Second Layer .............................................................................................................. 14
8 Third Layer ................................................................................................................. 15
9 Bottom Layer............................................................................................................... 16
10 Bottom Assembly.......................................................................................................... 17
11 Schematic .................................................................................................................. 18
List of Tables
1 EV2300 and bq24725A/735EVM Connections.......................................................................... 5
2 Bill of Materials............................................................................................................. 10
Intel is a trademark of Intel Corporation.
Windows is a trademark of Microsoft Corporation.
1
SLUU507A–June 2011–Revised September 2011 bq24735/725A Battery Charger Evaluation Module
Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated

Introduction www.ti.com
1 Introduction
1.1 EVM Features
• Evaluation module for bq24725A/735
• bq24735 adapter and battery together provide power to system to support Intel™ CPU Turbo Boost
mode
• High-efficiency NMOS-NMOS synchronous buck charger with 750-kHz frequency
• High-efficiency and low-cost NMOS power path selector and integrated gate driver
• User-selectable 1-cell, 2-cell, 3-cell, or 4-cell Li-ion battery voltage
• Programmable battery voltage, charge current, and ac adapter current via SMBus interface
• Flexible Chargeoption() register control via SMBus interface
• AC adapter operating range 4.5 V–24 V
• Test points for key signals available for testing purposes. Easy probe hook-up
• Jumpers available. Easy-to-change connections
1.2 General Description
The bq24725A/735 evaluation module (EVM) is a complete charger module for evaluating a multicell
synchronous notebook turbo boost charge using the bq24725A/735 devices. It is designed to deliver up to
4 A of charge current to Li-ion or Li-polymer applications. The charge current is programmable by SMBus
interface through the EV2300 interface board.
The bq24725A/735EVM does not include the EV2300 interface board. In order to evaluate the
bq24725A/735EVM, a user must order the EV2300 interface board separately.
The bq24725A/735 is a high-efficiency, synchronous battery charger, offering low component count for
space-constraint, multichemistry battery charging applications.
The bq24735 supports the Turbo Boost mode by allowing the battery to discharge energy to the system
when system power demand is temporarily higher than adapter maximum power level so that the adapter
does not crash.
The bq24725A/735 uses two charge pumps to separately drive n-channel MOSFETs (ACFET, RBFET,
and BATFET) for automatic system power source selection.
SMBus-controlled input current, charge current, and charge voltage DACs allow for high regulation
accuracies that can be easily programmed by the system power management microcontroller.
To throttle down PWM modulation and reduce the charge current, the bq24725A/735 uses the internal
input current register or the external ILIM pin .
The bq24725A/735 charges one, two, three, or four series Li+ cells and is available in a 20-pin, 3.5 x 3.5
mm2QFN package. For details, see the bq24725A/735 data sheet (SLUSAK9).
1.3 Input/Output Jack Description
Jack Description
J1–DCIN AC adapter, positive output
J1–GND AC adapter, negative output
J2-SYS Connected to system
J2-BAT Connected to battery pack
J2-GND Ground
J3-ACOK ACOK pin
J3-IOUT IOUT pin
J3-3.3V External voltage supply, 3.3 V
J4–SCL SCL pin output, SMBus clock line
J4–SDA SDA pin output, SMBus data line
2bq24735/725A Battery Charger Evaluation Module SLUU507A–June 2011–Revised September 2011
Submit Documentation Feedback
Copyright © 2011, Texas Instruments Incorporated

www.ti.com Test Summary
Jack Description
J4– GND External power supply, negative output
1.4 Control and Key Parameters Setting
Jack Description Factory Setting
JMP1 Connect battery voltage to VCC pin Jumper installed
1.5 Recommended Operating Conditions
Min Typ Max Unit Notes
Supply voltage, VIN Input voltage from ac adapter input 18 19-20 22 V
Battery voltage, VBAT Voltage applied at VBAT terminal 0 3-16.8 20 V
Maximum input current from ac adapter
Supply current, IAC 0 4.5 A
input
Charge current, Ichrg Battery charge current 1 3 4 A
Operating junction temperature range, TJ0 125 °C
2 Test Summary
2.1 Definitions
This procedure details how to configure the HPA710 evaluation board. On the test procedure, the
following naming conventions are followed. See the HPA710 schematic for details.
VXXX External voltage supply name (VADP, VBT, VSBT)
LOADW External load name (LOADR, LOADI)
V(TPyyy) Voltage at internal test point TPyyy. For example, V(TP12) means the voltage at TP12.
V(Jxx) Voltage at jack terminal Jxx
V(TP(XXX)) Voltage at test point XXX. For example, V(ACDET) means the voltage at the test point
which is marked as ACDET.
V(XXX, YYY) Voltage across point XXX and YYY.
I(JXX(YYY)) Current going out from the YYY terminal of jack XX.
Jxx(BBB) Terminal or pin BBB of jack xx
Jxx ON Internal jumper Jxx terminals are shorted.
Jxx OFF Internal jumper Jxx terminals are open.
Jxx (-YY-) ON Internal jumper Jxx adjacent terminals marked as YY are shorted.
Measure: →A,B 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 have location for jumpers, test points, and individual components.
2.2 Equipment
Power Supplies
Power Supply #1 (PS#1): a power supply capable of supplying 20 V at 5 A is required.
Power Supply #2 (PS#2): a power supply capable of supplying 5 V at 1 A is required.
Power Supply #3 (PS#3): a power supply capable of supplying 20 V at 5 A is required.
3
SLUU507A–June 2011–Revised September 2011 bq24735/725A Battery Charger Evaluation Module
Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated

Test Summary www.ti.com
Load #1
A 30-V (or above), 5-A (or above) electronic load that can operate at constant current mode
Load #2
A HP 6060B 3-V to 60-V/0-A to 60-A, 300-W system dc electronic load or equivalent
Meters
Seven Fluke 75 multimeters, (equivalent or better)
Or four equivalent voltage meters and three equivalent current meters.
The current meters must be capable of measuring 5-A+ current.
Computer
A computer with at least one USB port and a USB cable. The EV2300 USB driver and the
bq24725A/735 SMB evaluation software must be properly installed.
EV2300 SMBus Communication Kit
An EV2300 SMBUS communication kit
Software
Install the EV2300 driver before installing the bq24725A/735 software.
Driver (USB EV2300) Installer XP2K – Last updated Jan28-04.zip or later: This is the EV2300 USB
driver. Save and unzip to c:\temp (or other local directory). Double-click on the setup.exe file. Perform the
following installation steps.
1. This software needs to be installed after the EV2300 USB driver.
• bq2473x EVSW setup.zip (SLUC258): This is the bq24725A/735 SMB evaluation software. Save
and unzip to c:\temp (or other local directory). Double-click on the setup.exe file. Perform the
following steps.
• Note that on first insertion of EV2300 into the USB port of personal computer (PC), the user needs
to follow the instructions of the Found New Hardware wizard.
• Allow the Windows™ operating system to connect to Windows Update to search for software.
Then click Next.
• Select Install software automatically (Recommended). Then click Next.
• If a window pops up informing that the TI USB Firmware Updater has not passed Windows Logo
testing, click Continue Anyway.
• If a target file already exists and is newer, do not overwrite the newer file.
• Click Finish.
2.3 Equipment Setup
1. Set the power supply #1 for 0 V ± 100 mVdc, with the current limit set to > 5 A, and then turn off
supply.
2. Connect the output of power supply #1 in series with a current meter (multimeter) to J1 (DCIN, GND).
3. Connect a voltage meter across J1 (DCIN, GND).
4. Set the power supply #2 for 3.3 V ± 100 mVdc, 0.2-A ± 0.1-A current limit, and then turn off supply.
5. Connect the output of the power supply #2 to J3 (3.3 V) and J4 (GND).
6. Connect a voltage meter across J2 (BAT, GND).
7. Connect a voltage meter across J2 (SYS, GND).
8. Connect J4 (SDA, SCL) and J4 (GND) to the EV2300 kit SMB port. See Table 1 for a connection
reference. Connect the USB port of the EV2300 kit to the USB port of the computer. The connections
are shown in Figure 1.
4bq24735/725A Battery Charger Evaluation Module SLUU507A–June 2011–Revised September 2011
Submit Documentation Feedback
Copyright © 2011, Texas Instruments Incorporated

DCIN
J1
GND
J2
GND
BAT
IOUT
J3
SYS
J4
GND
ACOK
3.3V SDA SCL
APPLICATION CIRCUIT
HPA710
bq247xxEVM
TP1
U1
V
Power
supply #2
V
USB
V
EV2300
I in
I
Power
supply #1
2003
EV2300
HPA002
VCC
HDQ
VOUT
GND
VOUT
SDA
SCL
GND
NC
SMBD
SMBC
GND
HDQI2C
SMB
USB
To Computer
USB port
SDA
SCL
GND
To EVM
2003
www.ti.com Test Summary
Table 1. EV2300 and bq24725A/735EVM Connections
bq24725A/735EVM-710 EV2300
GND (J4) GND (1)
SCL (J4) SMBC (2)
SDA (J4) SMBD (3)
Figure 1. EV2300 Kit Connections
9. If JP1 is not installed, install the jumper.
10. After performing the preceding steps, the test setup for HPA710 is configures as is shown in Figure 2.
Figure 2. Original Test Setup for HPA710
11. Turn on the computer. Open the bq24725A/735 evaluation software. The main window of the software
appears as is shown in Figure 3.
5
SLUU507A–June 2011–Revised September 2011 bq24735/725A Battery Charger Evaluation Module
Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated

Test Summary www.ti.com
Figure 3. Main Window of bq24725A/735 Evaluation Software
2.4 Procedure
2.4.1 AC Adapter Detection Threshold
1. Ensure that Section 2.3 steps are followed. Turn on PS#2.
Note: Load #1 and Load #2 are not connected during this step.
2. Turn on PS#1.
3. Increase the output voltage of PS#1 to 19.5 V.
Measure →V(TP(ACDET)) = 2.6 V ± 0.1 V
Measure →V(TP(ACOK)) = 3.3 V ± 0.1 V
Measure →V(J2(SYS)) = 19.5 V ± 0.5 V
Measure →V(TP(REGN)) = 6 V ± 0.5 V
Measure →V(TP(ACDRV, CMSRC)) = 6 V ± 0.5 V
Measure →V(J2(BAT, GND)) = 2 V ± 2 V
2.4.2 Charger Parameters Setting
1. In the software main window, click all the Read buttons. Ensure that no error information is
generated.
2. If the error information window pops up and you see USB Error. Insure USB cable is connected
and Driver is working., do the following steps.
a) Click OK. Then, close main window, as shown in Figure 3, and disconnect USB cable.
b) Check 3.3-V power supply (PS#2) and power supply #1 (PS#1) voltage on the EVM board.
6bq24735/725A Battery Charger Evaluation Module SLUU507A–June 2011–Revised September 2011
Submit Documentation Feedback
Copyright © 2011, Texas Instruments Incorporated

Ibat
V
Isys
V
ILoad
#1
Load
#2
I
DCIN
J1
GND
J2
GND
BAT
IOUT
J3
SYS
J4
GND
ACOK
3.3V
SDA SCL
APPLICATION CIRCUIT
HPA710
bq247xxEVM
TP1
U1
Power
supply #2
USB
V
EV2300
Iin
I
Power
supply #1
www.ti.com Test Summary
c) Disconnect any other unsure SMBus connection. Plug USB cable back to the original
EVM2300 installation USB port.
d) Open the bq24725A/735 evaluation software. The main window of the software is shown in
Figure 3.
3. In the software main window, click all the Read buttons.
a) Type in 512 (mA) in the Charge Current DAC, and click Write. This sets the battery charge
current regulation threshold.
b) Type in 12592 (mV) in the Charge Voltage DAC, and click Write. This sets the battery voltage
regulation threshold.
c) Measure →V(J2(BAT)) = 12.6 V ± 200 mV
2.4.3 Charge Current and ac Current Regulation, DPM
1. Type in 7801 in the Charge Option, and click Write; this disable
charging.
2. Connect the Load #2 in series with a current meter (multimeter) to J2 (BAT, GND).
Ensure that a voltage meter is connected across J2 (BAT, GND). Turn on the Load #2. Use the
constant voltage mode. Set the output voltage to 10.5 V.
3. Connect the output of the Load #1 in series with a current meter (multimeter) to J2 (SYS, GND).
Ensure that a voltage meter is connected across J2 (SYS, GND). Turn on the power of the Load
#1. Set the load current to 3 A ± 50 mA but disable the output. The setup is now like Figure 4 for
HPA710. Ensure that Ibat = 0 A ± 10 mA and Isys = 0 A ± 10 mA.
Figure 4. Test Setup for HPA710
4. Type in 7800 in the Charge Option, and click Write, this enable charging.
Measure →Ibat = 500 mA ± 100 mA
7
SLUU507A–June 2011–Revised September 2011 bq24735/725A Battery Charger Evaluation Module
Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated

Printed-Circuit-Board Layout Guideline www.ti.com
5. Type in 2944 (mA) in the Charge Current DAC and click Write. This sets the battery charge current
regulation threshold to 2.944A.
Measure →Ibat = 3000 mA ± 300 mA
Measure →V(TP(IOUT)) = 340 mV ± 40 mV
6. Enable the output of the Load #1.
Measure →Isys = 3000 mA ± 300 mA, Ibat = 1600 mA ± 300 mA, Iin = 4100 mA ± 400 mA
Measure →V(TP(IOUT)) = 820 mV ± 100 mV
7. Turn off the Load #1.
Measure →Isys = 0 ± 100 mA, Ibat = 3000 mA ± 300 mA.
2.4.4 Boost Mode – bq24735EVM Only
1. Set ChargeOption() bit [3] to 1, and click Write; this enables turbo boost function.
2. Replace Load #2 with PS#3. Ensure that a voltage meter is connected across J2 (BAT, GND).
3. Enable the output of the PS #3. Ensure that the output voltage is 10 V ± 500 mV.
4. Set the Load#1 load current to 5 A ± 50 mA. Enter boost mode
Measure →ISYS = 5000 mA ± 500 mA, IBAT = -2000 mA ± 300 mA, IIN = 4100 mA ± 400 mA
5. Set the Load#1 load current to 3 A ± 50 mA. Exit boost mode.
Measure →ISYS = 3000 mA ± 500 mA, IBAT = 1600 mA ± 300 mA, IIN = 4100 mA ± 400 mA
2.4.5 Power Path Selection
1. Type in 7801 in the Charge Option, and click Write; this disable charging.
Measure →V(J2(SYS)) = 19.5 V ± 1 V (adapter connected to system)
2. Turn off PS#1. (PS#3 setting per Section 2.4.4, Step 2 and Step 3.
Measure →V(J2(SYS)) = 10 V ± 1 V (battery connected to system)
Measure →V(J2(BAT)) = 10 V ± 1 V (battery connected to system)
3 Printed-Circuit-Board Layout Guideline
The switching node rise and fall times must be minimized for minimum switching loss. Proper layout of the
components to minimize high-frequency, current-path loop is important to prevent electrical and magnetic
field radiation and high-frequency resonant problems. The following is a printed-circuit-board (PCB) layout
priority list for proper layout. Layout of the PCB according to this specific order is essential.
1. Place input capacitor as close as possible to switching MOSFET’s supply and ground connections, and
use the shortest copper trace connection. These parts must be placed on the same layer of the PCB
instead of on different layers and using vias to make this connection.
2. The integrated circuit (IC) must be placed close to the switching MOSFET’s gate terminals and the
gate drive signal traces kept short for a clean MOSFET drive. The IC can be placed on the other side
of the PCB of switching MOSFETs.
3. Place the inductor input terminal as close as possible to the switching MOSFET’s output terminal .
Minimize the copper area of this trace in order to lower electrical and magnetic field radiation, but make
the trace wide enough to carry the charging current. Do not use multiple layers in parallel for this
connection. Minimize parasitic capacitance from this area to any other trace or plane.
4. The charging current-sensing resistor must be placed right next to the inductor output. Route the sense
leads connected across the sensing resistor back to the IC in the same layer, close to each other
(minimize loop area), and do not route the sense leads through a high-current path. Place decoupling
capacitor on these traces next to the IC.
5. Place output capacitor next to the sensing resistor output and ground.
8bq24735/725A Battery Charger Evaluation Module SLUU507A–June 2011–Revised September 2011
Submit Documentation Feedback
Copyright © 2011, Texas Instruments Incorporated

www.ti.com Printed-Circuit-Board Layout Guideline
6. The output capacitor ground connections need to be tied to the same copper that connects to the
input capacitor ground before connecting to the system ground.
7. Use single ground connection to tie the charger power ground to the charger analog ground. Just
beneath the IC, use analog ground copper pour, but avoid the power pins in order to reduce inductive
and capacitive noise coupling.
8. Route the analog ground separately from the power ground. Connect the analog ground, and then
connect the power ground separately. Connect analog ground and power ground together using power
pad as the single ground connection point. Or use a 0-Ωresistor to tie analog ground to the power
ground. (The power pad must tie to the analog ground in this case, if possible).
9. Place the decoupling capacitors next to the IC pins, and make the trace connection as short as
possible.
10. It is critical that the exposed power pad on the backside of the IC package be soldered to the PCB
ground. Ensure that sufficient thermal vias are located directly under the IC, connecting to the ground
plane on the other layers.
9
SLUU507A–June 2011–Revised September 2011 bq24735/725A Battery Charger Evaluation Module
Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated

Bill of Materials, Board Layout, and Schematics www.ti.com
4 Bill of Materials, Board Layout, and Schematics
Table 2. Bill of Materials
-001 -002 RefDes Value Description Size Part Number MFR
bq24725A bq24735
1 1 C1 2.2 µF Capacitor, Ceramic, 25V, X7R, 10% 1210 Std Std
6 6 C2, C3, C4, C5, C6, C7 10 µF Capacitor, Ceramic, 25V, X7R, 10% 1206 Std Std
6 6 C8, C14, C15, C16, C17, 0.1 µF Capacitor, Ceramic, 25V, X7R, 10% 603 Std Std
C19
4 4 C9, C10, C20, C25 1 µF Capacitor, Ceramic, 25V, X7R, 10% 603 Std Std
3 3 C11, C12, C27 0.01 µF Capacitor, Ceramic, 25V, X7R, 10% 603 Std Std
0 0 C13, C18, C24 Open Capacitor, Ceramic, 25V, X7R, 10% 603 Std Std
1 1 C21 0.047 µF Capacitor, Ceramic, 25V, X7R, 10% 603 Std Std
1 1 C22 100 pF Capacitor, Ceramic, 25V, X7R, 10% 603 Std Std
1 1 C23 2200 pF Capacitor, Ceramic, 25V, X7R, 10% 603 Std Std
1 1 C26 1000 pF Capacitor, Ceramic, 25V, X7R, 10% 603 Std Std
1 1 D1 BAT54-V-G Diode, Schottky, 200-mA, 30-V SOT23 BAT54-V-G Vishay-Liteon
1 1 D2 BAT54C-V-G Diode, Dual Schottky, 200-mA, 30-V SOT23 BAT54C-V-G Vishay-Liteon
1 1 J1 ED120/2DS Terminal Block, 2-pin, 15-A, 5.1mm 0.40 x 0.35 inch ED120/2DS OST
1 1 J2 ED120/3DS Terminal Block, 3-pin, 15-A, 5.1mm 0.60 x 0.35 inch ED120/3DS OST
2 2 J3. J4 ED555/3DS Terminal Block, 3-pin, 6-A, 3.5mm 0.41 x 0.25 inch ED555/3DS OST
1 1 JP1 PEC02SAAN Header, Male 2-pin, 100mil spacing, 0.100 inch x 2 PEC02SAAN Sullins
1 1 SH1 929950-00 Shorting jumpers, 2-pin, 100mil spacing, 929950-00 3M/ESD
1 1 L1 4.7 µH Inductor, SMT 0.255 x 0.270 inch IHLP2525CZER4R7M01 Vishay
3 3 Q1, Q2, Q3 CSD17307Q5A MOSFET, NChan, 30V, 14A, 9.5millohm PWRPAK S0-8 CSD17307Q5A Texas Instruments
2 2 Q4, Q5 CSD17308Q3A MOSFET, NChan, 30V, 13A, 9.4millohm PWRPAK 1212 CSD17308Q3A Texas Instruments
1 1 Q6 BSS138W-7-F MOSFET, Nch, 50V, 200mA, SOT-323 BSS138W-7-F Diodes
2 2 R1, R2 0.01 Resistor, Chip, 1/2W, 1% 150PPM 1206 PMR18EZPFU10L0 Rohm
Resistor, Chip, 1W, 1% 75 PPM WSLP1206R0100FEA Vishay/Dale
1 1 R3 0 Resistor, Chip, 1/16W, 5% 603 Std Std
1 1 R5 20 Resistor, Chip, 1/16W, 1% 603 Std Std
1 1 R4 7.5 Resistor, Chip, 1/16W, 1% 603 Std Std
2 2 R6, R7 3.9 Resistor, Chip, 0.5W, 5% 1210 Std Std
3 3 R8, R9, R13 4.02k Resistor, Chip, 1/10W, 1% 603 Std Std
0 0 R10, R11 Open Resistor, Chip, 1/16W, 1% 603 Std Std
1 1 R12 1.00M Resistor, Chip, 1/16W, 1% 603 Std Std
1 1 R14 66.5k Resistor, Chip, 1/16W, 1% 603 Std Std
1 1 R15 430k Resistor, Chip, 1/16W, 1% 603 Std Std
1 1 R16 10.0 Resistor, Chip, 1/4W, 1% 1206 Std Std
3 3 R17, R18, R19 10.0k Resistor, Chip, 1/16W, 1% 603 Std Std
10 bq24735/725A Battery Charger Evaluation Module SLUU507A–June 2011–Revised September 2011
Submit Documentation Feedback
Copyright © 2011, Texas Instruments Incorporated

www.ti.com Bill of Materials, Board Layout, and Schematics
Table 2. Bill of Materials (continued)
-001 -002 RefDes Value Description Size Part Number MFR
bq24725A bq24735
1 1 R20 100k Resistor, Chip, 1/16W, 1% 603 Std Std
1 1 R21 12.1k Resistor, Chip, 1/16W, 1% 603 Std Std
1 1 R22 316k Resistor, Chip, 1/16W, 1% 603 Std Std
1 1 R23 3.01M Resistor, Chip, 1/16W, 1% 603 Std Std
1 1 R24 10 Resistor, Chip, 1/16W, 1% 603 Std Std
1 1 TP1 131-4244-00 Adaptor, 3.5-mm probe clip ( or 131-5031-00) 0.200 inch 131-4244-00 Tektronix
11 11 TP2, TP3, TP4, TP5, TP6, Test Point, White, Thru Hole Color Keyed 0.100 x 0.100 inch 5002 Keystone
TP7, TP8, TP9, TP10,
TP11, TP12
1 1 TP13 GND Test Point, Black, Thru Hole Color Keyed 0.100 x 0.100 inch 5001 Keystone
0 0 TP14, 15, 16, 17, 18
4 4 6-32 NYL nuts NY HN 632 Building Fasteners
4 4 ST1,ST2,ST3,ST4 4816 STANDOFF M/F HEX 6-32 NYL .500" sf_thvt_325_rnd 4816 Keystone
1 0 U1 bq24725ARGR IC, SMBus Charge Controller with NMOS bq24725ARGR TI
Selector
0 1 U1 bq24735RGR IC, SMBus Charge Controller with NMOS bq24735RGR TI
Selector
1 1 — Label 1.25 x 0.25 inch THT-13-457-10 Brady
1 1 — HPA710 2.5x2.5inch 4 layer 2oz. PCB 2.5x2.5inch PCB Any
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.
3. Use of no clean flux is not acceptable.
4. Ref designators marked with an asterisk ('**') cannot be substituted. All other components can be substituted with equivalent MFG's components.
5. Install label after final wash. Text shall be 8 pt font. Text shall be per Table 1.
Table 1.
Assembly Number Text
HPA710-001 bq24725AEVM-710
HPA710-002 bq24735EVM-710
11
SLUU507A–June 2011–Revised September 2011 bq24735/725A Battery Charger Evaluation Module
Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated

T
I
EXAS
NSTRUMENTS
Bill of Materials, Board Layout, and Schematics www.ti.com
4.1 Board Layouts
Figure 5. Top Assembly
12 bq24735/725A Battery Charger Evaluation Module SLUU507A–June 2011–Revised September 2011
Submit Documentation Feedback
Copyright © 2011, Texas Instruments Incorporated

www.ti.com Bill of Materials, Board Layout, and Schematics
Figure 6. Top Layer
13
SLUU507A–June 2011–Revised September 2011 bq24735/725A Battery Charger Evaluation Module
Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated

Bill of Materials, Board Layout, and Schematics www.ti.com
Figure 7. Second Layer
14 bq24735/725A Battery Charger Evaluation Module SLUU507A–June 2011–Revised September 2011
Submit Documentation Feedback
Copyright © 2011, Texas Instruments Incorporated

www.ti.com Bill of Materials, Board Layout, and Schematics
Figure 8. Third Layer
15
SLUU507A–June 2011–Revised September 2011 bq24735/725A Battery Charger Evaluation Module
Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated

Bill of Materials, Board Layout, and Schematics www.ti.com
Figure 9. Bottom Layer
16 bq24735/725A Battery Charger Evaluation Module SLUU507A–June 2011–Revised September 2011
Submit Documentation Feedback
Copyright © 2011, Texas Instruments Incorporated

www.ti.com Bill of Materials, Board Layout, and Schematics
Figure 10. Bottom Assembly
17
SLUU507A–June 2011–Revised September 2011 bq24735/725A Battery Charger Evaluation Module
Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated

1
1
1
Bill of Materials, Board Layout, and Schematics www.ti.com
4.2 Schematics
Figure 11. Schematic
18 bq24735/725A Battery Charger Evaluation Module SLUU507A–June 2011–Revised September 2011
Submit Documentation Feedback
Copyright © 2011, Texas Instruments Incorporated

EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS
Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions:
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.
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 LIMITED 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. 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.
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 visit www.ti.com/esh or contact TI.
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. 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.
REGULATORY COMPLIANCE INFORMATION
As noted in the EVM User’s Guide and/or EVM itself, this EVM and/or accompanying hardware may or may not be subject to the Federal
Communications Commission (FCC) and Industry Canada (IC) rules.
For EVMs not subject to the above rules, this evaluation board/kit/module 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 or ICES-003 rules, which are designed to provide reasonable protection against radio frequency
interference. Operation of the equipment 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.
General Statement for EVMs including a radio
User Power/Frequency Use Obligations: This radio is intended for development/professional use only in legally allocated frequency and
power limits. Any use of radio frequencies and/or power availability of this EVM and its development application(s) must comply with local
laws governing radio spectrum allocation and power limits for this evaluation module. It is the user’s sole responsibility to only operate this
radio in legally acceptable frequency space and within legally mandated power limitations. Any exceptions to this are strictly prohibited and
unauthorized by Texas Instruments unless user has obtained appropriate experimental/development licenses from local regulatory
authorities, which is responsibility of user including its acceptable authorization.
For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant
Caution
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the
equipment.
FCC Interference Statement for Class A EVM devices
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to
cause harmful interference in which case the user will be required to correct the interference at his own expense.

FCC Interference Statement for Class B EVM devices
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment
generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
For EVMs annotated as IC – INDUSTRY CANADA Compliant
This Class A or B digital apparatus complies with Canadian ICES-003.
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the
equipment.
Concerning EVMs including radio transmitters
This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this
device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired
operation of the device.
Concerning EVMs including detachable antennas
Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain
approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should
be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication.
This radio transmitter has been approved by Industry Canada to operate with the antenna types listed in the user guide with the maximum
permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain
greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.
Cet appareil numérique de la classe A ou B est conforme à la norme NMB-003 du Canada.
Les changements ou les modifications pas expressément approuvés par la partie responsable de la conformité ont pu vider l’autorité de
l'utilisateur pour actionner l'équipement.
Concernant les EVMs avec appareils radio
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est
autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout
brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.
Concernant les EVMs avec antennes détachables
Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain
maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à
l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente
(p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante.
Le présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés dans le manuel
d’usage et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne non inclus dans
cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur.
SPACER
SPACER
SPACER
SPACER
SPACER
SPACER
SPACER
SPACER