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 Input voltage from external power supply. Max operating input
voltage is 18 V, OVP trip point. Abs max input voltage is 40 V while in
OVP.
J2 – OUT (+) / GND (-) Output connection - capacitor connection.
JP1 – OUT / REG / IN Source voltage for housekeeping regulator, U2. Provides pull-up
voltage for digital I/O. LDO input (REG) rated up to 40 V.
JP2 - CE Charge enable. Default setting is ON.
JP3 – Fixed / ISET / ADJ Sets fast charge current. fixed = 400 mA ADJ= R3 range 10 mA to
800 mA.
JP4 - STAT LED Default setting is ON.
JP5 – PG (Power Good) LED Default setting is ON.
JP-6 – C8 & C7 Disconnect Install to use Connect Onboard Capacitor.
JP-7 – 1S / 2S Voltage Select Set voltage to 2.5V or 5 V.
2.2 Printed Circuit Board Assembly
The BQ25173-Q1EVM PCB contains the BQ25173-Q1 IC, LDO TPS7B8133 and support circuits. This board
contains several jumpers and connectors. R3 can be used to adjust charge current (ISET) value from 10 mA to
800 mA. Charge Voltage VREG can be set to 4 values, 2.5V and 5 V with J7 and 7.5V and 10 V with R18 and
R17.
The board has two 10 F super capacitors, C8 & C7 connected in series for equivalent value of 5F at 5 V. Jumper
JP6 can be used to disconnect capacitors from output. Charge voltage can be set to 2.5V or 5 V with JP7,
1S and 2S configuration. For 3S and 4S, 7.5V and 10 V configuration resistor position R17 and R18 are used.
External capacitors are required and C8 & C7 are disconnected.
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.
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 BQ25173-Q1EVM. Note that the default jumper setting of headers and switches are marked with two
dots to indicate the shorting jumper position.
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 1- to 4-cell super capacitor. Maximum
recommend OUT regulation voltage is 10.5V. Abs max rating on OUT is 13 V.
2. Input power supply that can supply up to 40 V and 1 A. Note that charging can occur between 3 V to 18 V
input. Device is in OVP between 18 V to 40 V.
3. Voltage meter and current meter.
www.ti.com Hardware
SLUUCX1 – AUGUST 2023
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BQ25173-Q1 Evaluation Module 3
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