Texas Instruments BQ25176J User manual

EVM User's Guide: BQ25176JEVM
BQ25176J Evaluation Module
Description
The BQ25176J EVM contains the BQ25176J IC, LDO
TPS7B8133 and support circuits needed operate the
evaluation board. Only an external 5 V power supply
is needed to power the EVM and charge a 1-cell
battery. Charge Voltage VREG can be set to seven
values using switch S1. Charge current is set by R22
(ISET) value from 60 mA to 750 mA. A fix value of
400 mA is selected by JP4.
LDO U2 (TPS7B8133) provides 3.3V for
housekeeping voltage, powering LED and providing
voltage for CE. The NTC is simulated by a 10k
resistor and has the option to be adjusted by a trim
pot.
Features
• Support 1-Cell Li-Ion, Li-Poly, and LiFePO4
• Input voltage based dynamic power management
• Input voltage up-to-30V tolerant
• External resistor programmable operation
– Li-Ion: 4.15V, 4.2V, 4.35V, 4.4V
– LiFePO4: 3.5V, 3.6V, 3.7V
– ISET to set charge current from 60 mA to 750
mA
Applications
•True wireless headsets
•Wearable accessories, smart band
•Beauty and grooming
•Electric toothbrush
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1 Evaluation Module Overview
1.1 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 60
mA to 750 mA with external resistor on ISET.
This user’s guide describes the characteristics, operation, and use of the BQ25176JEVM evaluation
module(EVM). This EVM is designed to help the user evaluate and test the various operating modes of the
BQ25176J. This user’s guide includes setup instructions for the hardware, a schematic diagram, a bill of
materials(BOM), and PCB layout drawings for the evaluation module.
Throughout this user's guide, the abbreviations EVM, BQ25176JEVM, BMS033-004, and the term evaluation
module are synonymous with the BQ25176J evaluation module, unless otherwise noted.
1.2 Kit Contents
The package includes:
1. BQ25176J evaluation module (EVM) that has BQ25176J and supporting circuits.
1.3 Specification
This board contains several jumpers and connectors.
Parameter Specifications
Input voltage (operating) 5 V
Output voltage 3.5V to 4.4V
Output current 60 mA to 750 mA
Housekeeping voltage 3.3V
1.4 Device Information
The BQ25176J is an integrated 800-mA linear charger for 1-Cell Li-Ion, Li-Polymer, and LiFePO4 batteries
targeted at space-limited portable applications. The device has a single power output that charges the battery.
In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge
current if an internal temperature threshold, TREG, is exceeded.
The charger power stage and charge current sense functions are fully integrated. The charger function has high
accuracy current and voltage regulation loops, charge status display, and automatic charge termination.
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2 Hardware
2.1 I/O Descriptions
Table 2-1 lists the input and output connections available on this EVM and their respective descriptions.
Table 2-1. EVM I/O Connections
I/O Connector Description
J1 – VIN / GND Max operating input voltage is 25 V, OVP trip point.
Max input voltage is 30 V while in OVP.
J2 – OUT (BAT+) / GND (BAT-) / GND / TS Battery connection, TS is 10k NTC but is 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 = 400 mA ADJ= R22 range 60 mA to
600 mA.
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 2-2 lists the S1 switch positions for VSET and their respective descriptions. Use only one postion ON, do
not combine.
Table 2-2. VSET S1 Switch Positions
Position / RX / Value Li+Voltage / Configuration
#1 / R1 / 100k ohm 3.5V / 1-Cell LiFePO4
#2 / R2 / 82.5k ohm 3.6V / 1-Cell LiFePO4
#3 / R3 / 61.9k ohm 3.7V / 1-Cell LiFePO4
#4 / R4 / 35.7k ohm 4.15V / 1-Cell Li-Ion
#5 / R5 / 27.4k ohm 4.2V / 1-Cell Li-Ion
#6 / R6 / 24.3k ohm 4.35V / 1-Cell Li-Ion
#7 / R7 / 18.2k ohm 4.4V / 1-Cell Li-Ion
#8 / R8 / 0 ohm Short Circuit – No Charge
2.2 Printed Circuit Board Assembly
The BQ25176JEVM PCB contains the BQ25176J 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.
2.3 Best Practices
WARNING
Hot surface! Contact can cause burns. Do not touch!
Some components can 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 can be
present.
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2.4 Test Summary
This section describes the jumpers and connectors on the EVM as well as how to properly connect, setup, and
use the BQ25176JEVM. Note that the default jumper setting of headers and switches are marked with two dots
to indicate the shorting jumper position. This puts the unit into a single cell Li-Ion configuration, 4.2V at 400 mA.
2.4.1 Equipment
This section includes a list of supplies required to perform tests on this EVM.
1. Battery simulator such as Keithley 2400 or equivalent. Or a single-cell battery.
2. Power supply, 5 V 1 A input. Note that unit can operate up to 25 V input.
3. Voltage meter and current meter.
2.4.2 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 shuts off.
Device can get hot during high input-to-output voltage drop and high current conditions. Use caution when
handling the board.
2.4.3 Test Instructions
For this EVM to operate properly, the following components must be connected and properly configured.
1. Set input power supply to 5 V and Battery Simulator to 3.6V with compliance to support 800 mA. 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 and refer to Table 2-3.
4. Turn on all supplies and loads.
a. 5 V Input supply current must be greater than 500 mA.
b. Out voltage must be 3.6V and charge current 400 mA.
c. LED D1 and D2 is ON.
5. Simulate battery completing charge by increasing Battery Simulator voltage to 4.2V.
a. Current decreases to 0 mA.
b. LED D2 switches to OFF.
Table 2-3. Jumper Factory Setting
I/O Connector Factory Setting
JP1 (2 pin header) Installed
JP2 (3 pin Header) Installed REG to IN
JP3 (2 pin header) Installed
JP4 (3 pin header) Installed ISET to Fixed
JP5 (2 pin header) Installed
JP6 (3 pin header) Installed TS to Fixed
JP7 ( not installed ) N/A
JP8 ( not installed ) N/A
JP9 ( not installed ) N/A
S1 ( 8 Position Switch ) Position 5 (4.2V Li-Ion)
S2 ( not installed ) N/A
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3 Hardware Design Files
3.1 Schematic
The BQ25176JEVM schematic is shown in Figure 3-1.
3
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
R19
3266W-1-503LF
50k
R10
750
C3
50V
1μF
C4
1μF
16V
C1
50V
1μF
R23
1.00k
C2
1μF
16V
Battery
Pull-Up
Battery
TP14
TP1
TP4
JP2
SH-JP2
J1
TP5
TP3
BQ25176JDSG
OUT(BAT)
REG
IN(+)
3
1
21
2
5
IN
DNC
EN
OUT
GND
GND
PAD
U2
6
3
4
7
IN(+)
GND
1
2
U1
IN
ISET
OUT
STAT
GND
Thermal_Pad
1
2
9
5
4
8
Fixed
ISET
ADJ
1
2
TP6
JP3
1 2
2
21
1
D1
D2
SH-JP3
TPS7B8133QDRVRQ1
GND
VSET
6
PG
7
JP6
SH-JP6
GND
SH-JP5
JP5
1 2 3
R20
10.0k
1
2
J2
OUT(Bat+)
GND(Bat-)
R9
50k Ohm
TP9
TP8
GNDGND
GND
R21
499
GND
R22
PV37W502C01B00
5k ohm
TS-/CE
VSET-FB
Pull-Up
Pull-Up
R24
1.00k
/PG-TMR
3
4
/PG-TMR
TP2
Vin 3V to 40V max
TP12 TP13
SH-JP4 JP4
3
2
1
Fixed
TS
ADJ
ISET-ADJ
TS-/CE
GND
TS
VSET-ADJ
100k
82.5k
61.9k
35.7k
27.4k
24.3k
18.2k
0
TP7
JP1
SH-JP1
1
2
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
S1
R1
R2
R3
R4
R5
R6
R7
R8
76SB08ST
VSET
TMR-ADJ
TS
GND
GND
GND
GND
Pull-Up
GND
C6
50V
1μF
GND
C7
1μF
16V
C1
50V
1μF
C8
4700pF
R26
2.00k
R18
50k Ohm
R16
500K
R15
604k
R17
604k
R27
49.9k
R25
10.0k
SH-JP7
SH-JP9 SH-JP8
33.0k
/PG
FB-GND
GND
OFF
/CE
ON
TMR
78B04ST
JP7
R11
R12
R13
R14
S2
JP9
8
7
6
5
4
3
2
1
1
2
3
2
1
3
2
1
JP8
TS-/CE
18.2k
7.50k
0
/PG-TMR
VSET-FB
Battery
Figure 3-1. BQ25176JEVM Schematic
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3.2 Board Layout
The board layout is shown in Figure 3-2 to Figure 3-8.
Figure 3-2. Top Overlay
Figure 3-3. Top Solder
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Figure 3-4. Top Layer
Figure 3-5. Bottom Layer
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Figure 3-6. Bottom Solder
Figure 3-7. Bottom Overlay
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Figure 3-8. Drill Drawing
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3.3 Bill of Materials
Table 3-1 lists the bill of materials.
Table 3-1. Bill of Materials(1)
Designator Qty Value Description Package
Reference Part Number 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
603 GRT188R61H105ME13
D
MuRata
C2, C4 2 1uF CAP, CERM, 1 uF, 16 V, +/- 10%,
X7R, AEC-Q200 Grade 1, 0603
603 GCM188R71C105KA64
D
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 603 RC0603FR-07100KL Yageo
R2 1 82.5k RES, 82.5 k, 1%, 0.1 W, 0603 603 RC0603FR-0782K5L Yageo
R3 1 61.9k RES, 61.9 k, 1%, 0.1 W, 0603 603 RC0603FR-0761K9L Yageo
R4 1 35.7k RES, 35.7 k, 1%, 0.1 W, 0603 603 RC0603FR-0735K7L Yageo
R5 1 27.4k RES, 27.4 k, 1%, 0.1 W, 0603 603 RC0603FR-0727K4L Yageo
R6 1 24.3k RES, 24.3 k, 1%, 0.1 W, 0603 603 RC0603FR-0724K3L Yageo
R7 1 18.2k RES, 18.2 k, 1%, 0.1 W, 0603 603 RC0603FR-0718K2L Yageo
R8 1 0 RES, 0, 5%, 0.1 W, 0603 603 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 603 RC0603FR-07750RL Yageo
R19 1 50k Trimmer, 50k ohm, 0.25W, TH 4.5x8x6.7mm 3266W-1-503LF Bourns
R20 1 10.0k RES, 10.0 k, 1%, 0.1 W, AEC-
Q200 Grade 0, 0603
603 CRCW060310K0FKEA Vishay-Dale
R21 1 499 RES, 499, 1%, 0.1 W, 0603 603 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 603 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
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
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