Texas Instruments BQ25170EVM User manual

User’s Guide
BQ25170EVM Evaluation Module
Bill Johns
ABSTRACT
This user’s guide describes the characteristics, operation, and use of the BQ25170EVM evaluation module
(EVM). This EVM is designed to help the user evaluate and test the various operating modes of the BQ25170.
This user’s guide includes setup instructions for the hardware and software, a schematic diagram, a bill of
materials (BOM), and PCB layout drawings for the evaluation module.
Throughout this user's guide, the abbreviations EVM, BQ25170EVM, BMS033, and the term evaluation module
are synonymous with the BMS033 evaluation module, unless otherwise noted.
Table of Contents
1 Introduction.............................................................................................................................................................................2
1.1 Printed Circuit Board Assembly......................................................................................................................................... 2
1.2 I/O Descriptions..................................................................................................................................................................2
2 Test Summary......................................................................................................................................................................... 3
2.1 Equipment.......................................................................................................................................................................... 3
2.2 Cautions............................................................................................................................................................................. 3
2.3 Test Instructions................................................................................................................................................................. 3
3 Board Layout, Schematic, and Bill of Materials...................................................................................................................4
3.1 Board Layout......................................................................................................................................................................4
3.2 Schematic.......................................................................................................................................................................... 7
3.3 Bill of Materials...................................................................................................................................................................8
4 Revision History................................................................................................................................................................... 12
Trademarks
All trademarks are the property of their respective owners.
WARNING
Hot surface! Contact may cause burns. Do not touch!
Some components may reach high temperatures >55°C when the board is powered on. The user must
not touch the board at any point during operation or immediately after operating, as high temperatures
may be present.
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1 Introduction
The Texas Instruments BQ25170EVM is a Li-Ion, Li-Poly and LiFePO4 chemistry battery charger IC for single
cell. Charging voltage can be adjusted using external resistors on VSET. Charging current can be set from 60mA
to 600mA with external resistor on ISET.
1.1 Printed Circuit Board Assembly
The BQ25170EVM PCB contains the BQ25170 IC, LDO TPS7B8133 and support circuits. This board contains
several jumpers and connectors. S1 (VSET) allows selected output voltages to be programmed. R9 resistor
allows a wide range of adjustment of VSET. R22 can be used to change ISET value, fast charge current. R19
can be used to adjust TS, battery temp sensor to simulate hot and cold fault.
1.2 I/O Descriptions
Table 1-1 lists the input and output connections available on this EVM and their respective descriptions.
Table 1-1. EVM I/O Connections
I/O Connector Description
J1 – VIN / GND
Input voltage from external power supply, recommended 5V. Max
operating input voltage is 6.6V, OVP trip point. Max input voltage is
30V while in OVP.
J2 – OUT (BAT+) / GND (BAT-) / GND / TS Battery connection, TS should be 10k NTC but not needed.
JP1 – VSET ADJ. Disable R9, default is installed.
JP2 – REG / IN / OUT Source voltage for housekeeping regulator, U2. Default Input voltage
IN.
JP3 – PG (Power Good) LED Default setting is ON.
JP4 – ISET Sets Fast Charge Current. Fixed=400mA ADJ= R22 range 60mA to
600mA
JP5 - STAT LED Default setting is ON.
JP6 – TS NTC temp sensor. Fixed=10k (safe) ADJ=R19 range from 0 to 50k
ohms. Default Fixed.
JP7 Not used, do not install
JP8 Not used, do not install
JP9 Not used, do not install
Table 1-2 lists the S1 switch positions for VSET and their respective descriptions. Use only one postion ON, do
not combine.
Table 1-2. VSET S1 Switch Positions
Position / RX / Value Li+Voltage / Configuration
#1 / R1 / 100k ohm 3.5V / 1-Cell LiFePO4
#2 / R2 / 82k ohm 3.6V / 1-Cell LiFePO4
#3 / R3 / 62k ohm 3.7V / 1-Cell LiFePO4
#4 / R4 / 36k ohm 4.1V / 1-Cell Li-Ion
#5 / R5 / 27k ohm 4.2V / 1-Cell Li-Ion
#6 / R6 / 24k ohm 4.35V / 1-Cell Li-Ion
#7 / R7 / 18k ohm 4.4V / 1-Cell Li-Ion
#8 / R8 / 0 ohm Short Circuit – No Charge
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2 Test Summary
This section describes the jumpers and connectors on the EVM as well as how to properly connect, setup, and
use the BQ25170EVM. Note that the default jumper setting of headers and switches are marked with two dots to
indicate the shorting jumper position. This will put the unit into a single cell Li-Ion configuration, 4.2V at 400mA.
2.1 Equipment
This section includes a list of supplies required to perform tests on this EVM.
1. Battery simulator such as Keithley 2400 or equilvalent. Or a single-cell battery.
2. Power supply, 5V 1A input. Note that unit can operate up to 6.6V input.
3. Voltage meter and current meter.
2.2 Cautions
To prevent possible damage to battery under test verify that charging conditions of the cell are not exceeded.
Check max charge voltage and current.
Power dissipation of the device can be exceeded with too high an input to output voltage drop and current.
Thermal regulation begins reducing current at 125 °C, at 150 °C device will shut off.
Device can get hot during high input-to-output voltage drop and high current conditions. Use caution when
handling the board.
2.3 Test Instructions
In order for this EVM to operate properly, the following components must be connected and properly configured.
1. Set input power supply to 5V and Battery Simulator to 3.6V with compliance to support 800mA. Turn off
Supply and Battery Simulator.
2. Connect input voltages to J1 and Battery Simulator to J2 on the EVM.
3. Configure all EVM jumpers to factory setting, refer to table below.
4. Turn on all supplies and loads
a. 5V Input supply current limit should be greater than 500mA
b. Out voltage should be 3.6V and charge current 400mA
c. LED D1 and D2 will be ON
5. Simulate battery completing charge by increasing Battery Simulator voltage to 4.2V
a. Current will decrease to 0mA
b. LED D2 will switch to OFF.
Table 2-1. Jumper Factory Setting
I/O Connector Factory Setting
JP1 Installed
JP2 IN
JP3 Installed
JP4 Fixed
JP5 Installed
JP6 Fixed
JP7 N/A
JP8 N/A
JP9 N/A
S1 Position 3 (4.2 V Li-Ion)
S2 N/A
Note: IN, ON, Fixed are positions of a 3 pin header. If it is a 2 pin header then it is installed or not installed.
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3 Board Layout, Schematic, and Bill of Materials
3.1 Board Layout
The board layout is shown in Figure 3-1 to Figure 3-6.
Figure 3-1. Top Overlay
Figure 3-2. Top Solder
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Figure 3-3. Top Layer
Figure 3-4. Bottom Layer
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Figure 3-5. Bottom Solder
Figure 3-6. Bottom Overlay
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3.2 Schematic
The BQ25170EVM schematic is shown in Figure 3-7.
Figure 3-7. BQ25170EVM Schematic
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3.3 Bill of Materials
The bill of materials is shown in the following table.
Table 3-1. Bill of Materials
Designator Quantity Value Description PackageReference PartNumber Manufacturer Alternate
PartNumber
Alternate
Manufacturer
!PCB? 1 Printed Circuit Board BMS033 Any
C1, C3 2 1uF
CAP, CERM, 1 µF, 50
V,+/- 20%, X5R, AEC-
Q200 Grade 3, 0603
0603 GRT188R61H105ME13D MuRata
C2, C4 2 1uF
CAP, CERM, 1 uF,
16 V, +/- 10%, X7R,
AEC-Q200 Grade 1,
0603
0603 GCM188R71C105KA64D MuRata
D1, D2 2 Green LED, Green, SMD Body1.6x0.8mm LTST-C193TGKT-5A Lite-On
H1, H2, H3, H4 4
Bumpon,
Hemisphere, 0.44 X
0.20, Clear
Transparent Bumpon SJ-5303 (CLEAR) 3M
J1 1 Terminal Block,
3.5mm Pitch, 2x1, TH 7.0x8.2x6.5mm ED555/2DS On-Shore Technology
J2 1 Terminal Block,
3.5mm Pitch, 4x1, TH 14x8.2x6.5mm ED555/4DS On-Shore Technology
JP1, JP3, JP5 3 Header, 100mil, 2x1,
Tin, TH Header, 2 PIN, 100mil, Tin PEC02SAAN Sullins Connector Solutions
JP2, JP4, JP6 3 Header, 100mil, 3x1,
Tin, TH Header, 3 PIN, 100mil, Tin PEC03SAAN Sullins Connector Solutions
LBL1 1
Thermal Transfer
Printable Labels,
0.650" W x 0.200" H
- 10,000 per roll
PCB Label 0.650 x 0.200 inch THT-14-423-10 Brady
R1 1 100k RES, 100 k, 1%, 0.1
W, 0603 0603 RC0603FR-07100KL Yageo
R2 1 82.0k RES, 82.0 k, 1%, 0.1
W, 0603 0603 RC0603FR-0782KL Yageo
R3 1 62.0k RES, 62.0 k, 1%, 0.1
W, 0603 0603 RC0603FR-0762KL Yageo
R4 1 36.0k RES, 36.0 k, 1%, 0.1
W, 0603 0603 RC0603FR-0736KL Yageo
R5 1 27.0k RES, 27.0 k, 1%, 0.1
W, 0603 0603 RC0603FR-0727KL Yageo
R6 1 24.0k RES, 24.0 k, 1%, 0.1
W, 0603 0603 RC0603FR-0724KL Yageo
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Table 3-1. Bill of Materials (continued)
Designator Quantity Value Description PackageReference PartNumber Manufacturer Alternate
PartNumber
Alternate
Manufacturer
R7 1 18.0k RES, 18.0 k, 1%, 0.1
W, 0603 0603 RC0603FR-0718KL Yageo
R8 1 0 RES, 0, 5%, 0.1 W,
0603 0603 RC0603JR-070RL Yageo
R9 1 50k Ohm
Trimmer
Potentiometer, Lead
Sealed Type Multiturn
PV37 Series, TH
6.71x4.5mm PV37W503C01B00 Bourns
R10 1 750 RES, 750, 1%, 0.1 W,
0603 0603 RC0603FR-07750RL Yageo
R19 1 20k Trimmer, 20k ohm,
0.25W, TH 4.5x8x6.7mm 3266W-1-203LF Bourns
R20 1 10.0k
RES, 10.0 k, 1%, 0.1
W, AEC-Q200 Grade
0, 0603
0603 CRCW060310K0FKEA Vishay-Dale
R21 1 499 RES, 499, 1%, 0.1 W,
0603 0603 CRCW0603499RFKEAC Vishay-Dale
R22 1 5k Ohm
Trimmer
Potentiometer, Lead
Sealed Type Multiturn
PV37 Series, TH
6.71x4.5mm PV37W502C01B00 Bourns
R23, R24 2 1.00k RES, 1.00 k, 1%, 0.1
W, 0603 0603 RC0603FR-071KL Yageo
S1 1 Switch, SPST 8Pos,
Rocker, TH 9.65X8X22.4mm 76SB08ST Grayhill
SH-JP1, SH-
JP2, SH-JP3,
SH-JP4, SH-
JP5, SH-JP6,
SH-JP7
7 1x2 Shunt, 100mil, Gold
plated, Black Shunt SNT-100-BK-G Samtec 969102-0000-DA 3M
TP1, TP2, TP3,
TP4, TP5, TP6,
TP7, TP8, TP9,
TP10, TP12,
TP13, TP14
13 Test Lead clips and
hooks, SMT
Test Point, Body
3.25x1.65mm S1751-46 Harwin
U1 1
BQ25170DSG,
DSG0008A
(WSON-8)
DSG0008A BQ25170DSG - 1S Li-Ion Texas Instruments Texas Instruments
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Table 3-1. Bill of Materials (continued)
Designator Quantity Value Description PackageReference PartNumber Manufacturer Alternate
PartNumber
Alternate
Manufacturer
U2 1
Automotive 150-mA
high-voltage ultra-low-
IQ low-dropout
(LDO) linear
regulator, DRV0006A
(WSON-6)
DRV0006A TPS7B8133QDRVRQ1 Texas Instruments Texas Instruments
C5 0 100pF
CAP, CERM, 100 pF,
50 V, +/- 1%, C0G/
NP0, 0402
0402 04025A101FAT2A AVX
C6 0 1uF
CAP, CERM, 1 µF, 50
V,+/- 20%, X5R, AEC-
Q200 Grade 3, 0603
0603 GRT188R61H105ME13D MuRata
C7 0 1uF
CAP, CERM, 1 uF,
16 V, +/- 10%, X7R,
AEC-Q200 Grade 1,
0603
0603 GCM188R71C105KA64D MuRata
C8 0 4700pF
CAP, CERM, 4700 pF,
50 V, +/- 10%, X5R,
0603
0603 GRM188R61H472KA01D MuRata
FID1, FID2,
FID3 0
Fiducial mark. There
is nothing to buy or
mount.
N/A N/A N/A
JP7 0 Header, 100mil, 2x1,
Tin, TH Header, 2 PIN, 100mil, Tin PEC02SAAN Sullins Connector Solutions
JP8, JP9 0 Header, 100mil, 3x1,
Tin, TH Header, 3 PIN, 100mil, Tin PEC03SAAN Sullins Connector Solutions
R11 0 33.0k RES, 33.0 k, 1%, 0.1
W, 0603 0603 RC0603FR-0733KL Yageo
R12 0 18.2k RES, 18.2 k, 1%, 0.1
W, 0603 0603 RC0603FR-0718K2L Yageo
R13 0 7.50k RES, 7.50 k, 1%, 0.1
W, 0603 0603 RC0603FR-077K5L Yageo
R14 0 0 RES, 0, 5%, 0.1 W,
0603 0603 RC0603JR-070RL Yageo
R15, R17 0 604k RES, 604 k, 0.1%,
0.125 W, 0805 0805 RT0805BRD07604KL Yageo America
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