Texas Instruments BQ25170, Руководство пользователя

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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
Introduction www.ti.com
2 BQ25170EVM Evaluation Module SLUUCD6A – AUGUST 2020 – REVISED JUNE 2021
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