Texas Instruments BQ25170, User Manual

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

Submit Document Feedback

Copyright © 2021 Texas Instruments Incorporated