Texas Instruments bq24725EVM User manual

User's Guide
SLUU439A–August 2010–Revised May 2011
bq24725EVM Evaluation Module
This user's guide describes the features and operation of the bq24725EVM Evaluation Module (EVM).
This EVM assists users in evaluation the bq24725 synchronous battery charger. The manual includes the
bq24725EVM bill of materials, board layout, and schematic.
Contents
1 Introduction .................................................................................................................. 1
2 Test Summary ............................................................................................................... 3
3 PCB Layout Guideline ...................................................................................................... 7
4 Bill of Materials, Board Layouts and Schematics ....................................................................... 8
List of Figures
1 Connections of the EV2300 Kit ........................................................................................... 4
2 Original Test Setup for HPA-542 (bq24725 EVM)...................................................................... 5
3 Main Window of the bq24725 Evaluation Software .................................................................... 5
4 Test Setup for HPA-542.................................................................................................... 7
5 Top Layer................................................................................................................... 10
6 Second Layer .............................................................................................................. 10
7 Third Layer ................................................................................................................. 11
8 Bottom Layer............................................................................................................... 11
9 Top Mask................................................................................................................... 12
10 Bottom Mask ............................................................................................................... 12
11 Top Silkscreen............................................................................................................. 13
12 Bottom Silkscreen ......................................................................................................... 13
13 Top Assembly.............................................................................................................. 14
14 Bottom Assembly.......................................................................................................... 14
List of Tables
1 bq24275EVM and EV2300 Connections................................................................................. 4
2 Bill of Materials.............................................................................................................. 8
1 Introduction
1.1 EVM Features
•Evaluation module for bq24725
•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 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 9 V –24 V
•Test points for key signals available for testing. Easy probe hook-up
Windows is a trademark of Microsoft Corporation.
1
SLUU439A–August 2010–Revised May 2011 bq24725EVM Evaluation Module
Submit Documentation Feedback Copyright ©2010–2011, Texas Instruments Incorporated

Introduction www.ti.com
• Jumpers available. Easy-to-change connections.
1.2 General Description
The bq24725EVM evaluation module (also referred to as HPA-542) is a complete charger module for
evaluating a multicell synchronous notebook charge using the bq24725 devices. It is designed to deliver
up to 4 A of charge current to Li-ion or Li-polymer applications.
The bq24725 does not include the EV2300 interface board. To evaluate the bq24725, the EV2300
interface board must be ordered separately.
The bq24725 has a highly integrated battery charge controller designed to work with external host
commands. The charge voltage, charge current, input current, and flexible charge option are
programmable with a SMBus interface.
The bq24725 supports high-efficiency and low-cost NMOS power path selector and has an integrated gate
driver for both adapter-side and battery-side power path selector switch.
The dynamic power management (DPM) function modifies the charge current depending on system load
conditions, avoiding ac adapter overload.
High-accuracy current sense amplifiers enable accurate measurement of the ac adapter current, allowing
monitoring of overall system power.
For details, see bq24725 data sheet (SLUS702).
1.3 I/O 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
J4–GND External power supply, negative output
1.4 Controls 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 6 - 20 V
16.8
Supply current, IAC Maximum input current from ac adapter 0 4.5 A
input
Charge current, Ichrg Battery charge current 1 3 4 A
Operating junction temperature 0 125 °C
range, TJ
2bq24725EVM Evaluation Module SLUU439A–August 2010–Revised May 2011
Submit Documentation Feedback
Copyright ©2010–2011, Texas Instruments Incorporated

www.ti.com Test Summary
2 Test Summary
2.1 Definitions
This procedure details how to configure the HPA-542 evaluation board. On the test procedure, the
following naming conventions are followed. Refer to the HPA542 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
2.2.1 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 1 A is required.
2.2.2 Load #1
A 30-V (or above), 5-A (or above) electronic load that can operate at constant current mode
2.2.3 Load #2
An HP 6060B 3-V to 60-V/0-A to 60-A, 300-W system dc electronic load or equivalent
2.2.4 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.
2.2.5 Computer
A computer with at least one USB port and a USB cable. The EV2300 USB driver and the bq24725 SMB
evaluation software must be properly installed.
2.2.6 EV2300 SMBUS Communication Kit
An EV2300 SMBUS communication kit
3
SLUU439A–August 2010–Revised May 2011 bq24725EVM Evaluation Module
Submit Documentation Feedback Copyright ©2010–2011, Texas Instruments Incorporated

Test Summary www.ti.com
2.2.7 Software
1. "Driver(USB EV2300) Installer XP2K-Last updated Jan28-04.zip": This is the EV2300 USB driver. Save
and unzip to c:\temp (or other directory). Double-click on the "setup.exe" file. Follow the installation
steps.
2. "bq24725EVMSetup.zip" (SLUC202): This is the bq24725 SMB evaluation software. Save and unzip to
c:\temp (or other directory). Double-click on the “SETUP.EXE”file. Follow the installation steps. This
software needs to be installed after the EV2300 USB driver.
3. Note: When the EV2300 is first inserted into the USB port of the personal computer, the user must
follow the instructions of the "Found New Hardware Wizard."
4. Allow Windows™to connect to Windows Update to search for software. Then click Next.
5. Select "Install software automatically (Recommended)." Then click Next.
6. If a window pops up informing the user that the TI USB Firmware Updater has not passed WIndows
Logo testing, click "Continue Anyway."
7. If a target file already exists and is newer, do not overwrite the newer file.
8. 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 connection
references. Connect the USB port of the EV2300 kit to the USB port of the computer. The connections
are shown in Figure 1.
Table 1. bq24275EVM and EV2300 Connections
bq24725EVM EV2300
GND (J4) GND (1)
SCL (J4) SMBC (2)
SDA (J4) SMBD (3)
Figure 1. Connections of the EV2300 Kit
9. If JMP1 is not installed, install the jumper.
10. The test setup for HPA542 is shown in Figure 2.
4bq24725EVM Evaluation Module SLUU439A–August 2010–Revised May 2011
Submit Documentation Feedback
Copyright ©2010–2011, Texas Instruments Incorporated

DCIN
www.ti.com Test Summary
Figure 2. Original Test Setup for HPA-542 (bq24725 EVM)
11. Turn on the computer. Open the bq24725 evaluation software. The main window of the software is
shown in Figure 3.
Figure 3. Main Window of the bq24725 Evaluation Software
5
SLUU439A–August 2010–Revised May 2011 bq24725EVM Evaluation Module
Submit Documentation Feedback Copyright ©2010–2011, Texas Instruments Incorporated

Test Summary www.ti.com
2.4 Procedure
2.4.1 AC Adapter Detection Threshold
1. Be sure to follow EQUIPMENT SETUP steps. Turn on PS#2.
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)) = 1 V ±1 V
2.4.2 Charger Parameters Settings
1. In the software main window, click all the Read buttons. Make sure no error information is generated.
2. If an error information window pops up that reads "USB Error. Ensure USB cable is connected and
Driver is working," perform the following steps.
•Click OK. Close main window (shown in Figure 3), and disconnect the USB cable.
•Check the 3.3-V power supply (PS#2) and power supply #1 (PS#1) voltage on the EVM board.
•Disconnect any uncertain SMBus connections. Plug in the USB cable into the original EVM2300
installation USB port.
•Open the bq24725 evaluation software. The main window of the software is shown in Figure 3.
3. Type in "512" (mA) in the Charge Current DAC, and click the Write button. This sets the battery charge
current regulation threshold.
4. Type in "12592" (mV) in the Charge Voltage DAC, and click the Write button. This sets the battery
voltage regulation threshold.
Measure →V(J2(BAT)) = 12.6 V ±200 mV
2.4.3 Charge Current and AC Current Regulation (DPM)
1. Type in "7905" in the Charge Option, and click the Write button. This disables 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. 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 HPA542. Ensure that Ibat = 0 A ±10 mA and Isys = 0 A ±10 mA.
6bq24725EVM Evaluation Module SLUU439A–August 2010–Revised May 2011
Submit Documentation Feedback
Copyright ©2010–2011, Texas Instruments Incorporated

DCIN
www.ti.com PCB Layout Guideline
Figure 4. Test Setup for HPA-542
4. Type in "7905" in the Charge Option, and click the Write button. This enables charging.
Measure →Ibat = 500 mA ±100 mA
5. Type in "2944" (mA) in the Charge Current DAC, and click the Write button. This sets the battery
charge current regulation threshold to 2.944 A.
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 ±200 mA, Iin = 4100 mA ±400 mA
Measure →V(TP(IOUT)) = 820 mV ±100 mV
7. Turn off the Load #1.
Measure →Isys = 0 A ±100 mA, Ibat = 3000 mA ±300 mA.
8.
2.4.4 Power Path Selection
1. Type in "7905" in the Charge Option, and click the Write button. This disables charging.
2. Replace Load #2 and current meter with PS#3. Make sure a voltage meter is connected across J2
(BAT, GND). Enable the output of the PS #3. Ensure that the output voltage is 10 V ±500 mV.
Measure →Measure ±V(J2(SYS)) = 19.5 V ±1 V (adapter connected to system)
3. Turn off PS#1.
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 PCB 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. Laying out a PCB according to this specific order is essential.
7
SLUU439A–August 2010–Revised May 2011 bq24725EVM Evaluation Module
Submit Documentation Feedback Copyright ©2010–2011, Texas Instruments Incorporated

Bill of Materials, Board Layouts and Schematics www.ti.com
1. Place input capacitor as close as possible to switching MOSFET’s supply and ground connections, and
use shortest copper trace connection. These parts must be placed on the same layer of the PCB
instead of on different layers and vias used 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 inductor input terminal to switching MOSFET's output terminal as close as possible. Minimize the
copper area of this trace 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 mut 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.
6. Output capacitor ground connections need to be tied to the same copper that connects to the input
capacitor ground before connecting to system ground.
7. Use single ground connection to tie charger power ground to charger analog ground. Just beneath the
IC, use analog ground copper pour but avoid power pins to reduce inductive and capacitive noise
coupling.
8. Route analog ground separately from power ground. Connect analog ground and 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 power ground (power pad must tie to
analog ground in this case if possible).
9. Decoupling capacitors must be placed next to the IC pins, and make 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 directly under the IC, connecting to the ground plane on
the other layers.
4 Bill of Materials, Board Layouts and Schematics
4.1 Bill of Materials
Table 2. Bill of Materials
Count RefDes Value Description Size Part Number MFR
1 C1 2.2 µF Capacitor, Ceramic, 25V, X7R, 10% 1210 Std Std
6 C2, C3, C4, 10 µF Capacitor, Ceramic, 25V, X7R, 10% 1206 Std Std
C5, C6, C7
6 C8, C14, C15, 0.1 µF Capacitor, Ceramic, 25V, X7R, 10% 603 Std Std
C16, C17,
C19
4 C9, C10, C20, 1 µF Capacitor, Ceramic, 25V, X7R, 10% 603 Std Std
C25
2 C11, C12 0.01 µF Capacitor, Ceramic, 25V, X7R, 10% 603 Std Std
0 C13, C18, OPEN Capacitor, Ceramic, 25V, X7R, 10% 603 Std Std
C24, C26
1 C21 0.047 µF Capacitor, Ceramic, 25V, X7R, 10% 603 Std Std
1 C22 100 pF Capacitor, Ceramic, 25V, X7R, 10% 603 Std Std
1 C23 2200 pF Capacitor, Ceramic, 25V, X7R, 10% 603 Std Std
1 D1 BAT54-V-G Diode, Schottky, 200-mA, 30-V SOT23 BAT54-V-G Vishay-Liteon
1 D2 BAT54C-V-G Diode, Dual Schottky, 200-mA, 30-V SOT23 BAT54C-V-G Vishay-Liteon
1 J1 ED120/2DS Terminal Block, 2-pin, 15-A, 5.1mm 0.40 x 0.35 inch ED120/2DS OST
1 J2 ED120/3DS Terminal Block, 3-pin, 15-A, 5.1mm 0.60 x 0.35 inch ED120/3DS OST
2 J3, J4 ED555/3DS Terminal Block, 3-pin, 6-A, 3.5mm 0.41 x 0.25 inch ED555/3DS OST
1 JP1 PEC02SAAN Header, Male 2-pin, 100mil spacing, 0.100 inch x 2 PEC02SAAN Sullins
8bq24725EVM Evaluation Module SLUU439A–August 2010–Revised May 2011
Submit Documentation Feedback
Copyright ©2010–2011, Texas Instruments Incorporated

www.ti.com Bill of Materials, Board Layouts and Schematics
Table 2. Bill of Materials (continued)
Count RefDes Value Description Size Part Number MFR
1 JP1 929950-00 Shorting jumpers, 2-pin, 100mil spacing, 929950-00 3M/ESD
1 L1 4.7 µH Inductor, SMT 0.255 x 0.270 IHLP2525CZER4R7M0 Vishay
inch 1
3 Q1, Q2, Q3 FDS6680A MOSFET, NChan, 30V, 12.5A, 9.5millohm PWRPAK S0-8 FDS6680A Fairchild
2 Q4, Q5 Sis412DN-T1 MOSFET, NChan, 30V, 12A, 30millohm PWRPAK 1212 Sis412DN-T1 Vishay
1 Q6 BSS138W-7-F MOSFET, Nch, 50V, 200mA, SOT-323 BSS138W-7-F Diodes
2 R1, R2 0.01 Resistor, Chip, 1/2W, 1% 150PPM 1206 PMR18EZPFU10L0 Rohm
Resistor, Chip, 1W, 1% 75 PPM WSLP1206R0100FEA Vishay/Dale
2 R3, R5 0 Resistor, Chip, 1/16W, 5% 603 Std Std
1 R4 7.5 Resistor, Chip, 1/16W, 1% 603 Std Std
2 R6, R7 3.9 Resistor, Chip, 0.5W, 5% 1210 Std Std
3 R8, R9, R13 4.02k Resistor, Chip, 1/10W, 1% 603 Std Std
0 R10, R11 OPEN Resistor, Chip, 1/16W, 1% 603 Std Std
1 R12 1.00M Resistor, Chip, 1/16W, 1% 603 Std Std
1 R14 66.5k Resistor, Chip, 1/16W, 1% 603 Std Std
1 R15 430k Resistor, Chip, 1/16W, 1% 603 Std Std
1 R16 10 Resistor, Chip, 1/4W, 1% 1206 Std Std
3 R17, R18, 10.0k Resistor, Chip, 1/16W, 1% 603 Std Std
R19
1 R20 100k Resistor, Chip, 1/16W, 1% 603 Std Std
1 R21 12.1k Resistor, Chip, 1/16W, 1% 603 Std Std
1 R22 316k Resistor, Chip, 1/16W, 1% 603 Std Std
1 R23 3.01M Resistor, Chip, 1/16W, 1% 603 Std Std
1 R24 10 Resistor, Chip, 1/16W, 1% 603 Std Std
1 TP1 131-4244-00 Adaptor, 3.5-mm probe clip ( or 131-5031-00) 0.200 inch 131-4244-00 Tektronix
11 TP2, TP3, Test Point, White, Thru Hole Color Keyed 0.100 x 0.100 5002 Keystone
TP4, TP5, inch
TP6, TP7,
TP8, TP9,
TP10, TP11,
TP12
1 TP13 GND Test Point, Black, Thru Hole Color Keyed 0.100 x 0.100 5001 Keystone
inch
0 TP14, 15, 16,
17, 18
4 6-32 NYL nuts NY HN 632 Building
Fasteners
4 ST1, ST2, 4816 STANDOFF M/F HEX 6-32 NYL 0.500"sf_thvt_325_rnd 4816 Keystone
ST3, ST4
1 U1 bq24725RGR IC, SMBus charge controller with NMOS bq24725RGR TI
selector
1–Label 1.25 x 0.25 inch THT-13-457-10 Brady
1–HPA542 2.5x2.5inch 4 layer 2oz. PCB 2.5x2.5inch PCB Any
9
SLUU439A–August 2010–Revised May 2011 bq24725EVM Evaluation Module
Submit Documentation Feedback Copyright ©2010–2011, Texas Instruments Incorporated

Bill of Materials, Board Layouts and Schematics www.ti.com
4.2 Board Layouts
Figure 5. Top Layer
Figure 6. Second Layer
10 bq24725EVM Evaluation Module SLUU439A–August 2010–Revised May 2011
Submit Documentation Feedback
Copyright ©2010–2011, Texas Instruments Incorporated

www.ti.com Bill of Materials, Board Layouts and Schematics
Figure 7. Third Layer
Figure 8. Bottom Layer
11
SLUU439A–August 2010–Revised May 2011 bq24725EVM Evaluation Module
Submit Documentation Feedback Copyright ©2010–2011, Texas Instruments Incorporated

Bill of Materials, Board Layouts and Schematics www.ti.com
Figure 9. Top Mask
Figure 10. Bottom Mask
12 bq24725EVM Evaluation Module SLUU439A–August 2010–Revised May 2011
Submit Documentation Feedback
Copyright ©2010–2011, Texas Instruments Incorporated

www.ti.com Bill of Materials, Board Layouts and Schematics
Figure 11. Top Silkscreen
Figure 12. Bottom Silkscreen
13
SLUU439A–August 2010–Revised May 2011 bq24725EVM Evaluation Module
Submit Documentation Feedback Copyright ©2010–2011, Texas Instruments Incorporated

Bill of Materials, Board Layouts and Schematics www.ti.com
Figure 13. Top Assembly
Figure 14. Bottom Assembly
4.3 Schematics
The schematic is shown on the following page.
14 bq24725EVM Evaluation Module SLUU439A–August 2010–Revised May 2011
Submit Documentation Feedback
Copyright ©2010–2011, Texas Instruments Incorporated

1
1
1
www.ti.com Bill of Materials, Board Layouts and Schematics
15
SLUU439A–August 2010–Revised May 2011 bq24725EVM Evaluation Module
Submit Documentation Feedback Copyright ©2010–2011, 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
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 18 V to 22 V and the output voltage range of 6 V to 20 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 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.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright ©2011, Texas Instruments Incorporated

IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements,
and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should
obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are
sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard
warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where
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
applications using TI components. To minimize the risks associated with customer products and applications, customers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right,
or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information
published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a
warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual
property of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied
by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive
business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional
restrictions.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all
express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not
responsible or liable for any such statements.
TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably
be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing
such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products
and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be
provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in
such safety-critical applications.
TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are
specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military
specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at
the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.
TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are
designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated
products in automotive applications, TI will not be responsible for any failure to meet such requirements.
Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products Applications
Audio www.ti.com/audio Communications and Telecom www.ti.com/communications
Amplifiers amplifier.ti.com Computers and Peripherals www.ti.com/computers
Data Converters dataconverter.ti.com Consumer Electronics www.ti.com/consumer-apps
DLP® Products www.dlp.com Energy and Lighting www.ti.com/energy
DSP dsp.ti.com Industrial www.ti.com/industrial
Clocks and Timers www.ti.com/clocks Medical www.ti.com/medical
Interface interface.ti.com Security www.ti.com/security
Logic logic.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense
Power Mgmt power.ti.com Transportation and www.ti.com/automotive
Automotive
Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video
RFID www.ti-rfid.com Wireless www.ti.com/wireless-apps
RF/IF and ZigBee® Solutions www.ti.com/lprfTI E2E Community Home Page e2e.ti.com
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2011, Texas Instruments Incorporated

Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Texas Instruments:
BQ24725EVM-542