Texas Instruments BQ25176MEVM User manual

EVM User's Guide:
BQ25176MEVM Evaluation Module
ABSTRACT
This user’s guide describes the characteristics, operation, and use of the BQ25176MEVM evaluation module
(EVM). This EVM is designed to help the user evaluate and test the various operating modes of the BQ25176M.
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, BQ25176MEVM, BMS069, and the term evaluation
module are synonymous with the BMS069 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....................................................................................................................................................................11
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 BQ25176EVM 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 BQ25176EVM PCB contains the BQ25176 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 BIAS, 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 5
V. Max operating input voltage is 6.6 V, OVP trip point. Max
input voltage is 30 V while in OVP.
J2 – OUT (BAT+) / GND (BAT-) / GND / BIAS Battery connection, connect 10-kΩ resistor to BIAS or use 10
kΩ on PCB (JP6).
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 – BIAS Fixed=10 k.
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 / 100 kΩ 3.5V / 1-Cell LiFePO4
#2 / R2 / 82.5 kΩ 3.6V / 1-Cell LiFePO4
#3 / R3 / 61.9 kΩ 3.7V / 1-Cell LiFePO4
#4 / R4 / 35.7 kΩ 4.15V / 1-Cell Li-Ion
#5 / R5 / 27.4 kΩ 4.2V / 1-Cell Li-Ion
#6 / R6 / 24.3 kΩ 4.35V / 1-Cell Li-Ion
#7 / R7 / 18.2 kΩ 4.4V / 1-Cell Li-Ion
#8 / R8 / 0 Ω 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 BQ25176EVM. 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, 4.2 V at 400 mA.
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, 5-V 1-A input. Note that unit can operate up to 6.6-V 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 5 V and Battery Simulator to 3.6 V 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, refer to table below.
4. Turn on all supplies and loads
a. 5-V Input supply current limit should be greater than 500 mA
b. Out voltage should be 3.6 V and charge current 400 mA
c. LED D1 and D2 will be ON
5. Simulate battery completing charge by increasing Battery Simulator voltage to 4.2 V
a. Current will decrease to 0 mA
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 5 (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 3-7.
Figure 3-1. Top Overlay
Figure 3-2. Top Solder
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Figure 3-3. Top Layer
Figure 3-4. Bottom Layer
Figure 3-5. Bottom Solder
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BQ25176MEVM Evaluation Module 5
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