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BQ25171-Q1

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Automotive, 800-mA linear battery charger for 1- to 2-cell Li-ion, LiFePO4, and 1- to 6-cell NiMH

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Data sheet

BQ25171-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Number of series cells 1, 2, 3, 4, 5, 6 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4, NiMH Charge current (max) (A) 0.8 Features AEC-Q100 Automotive Qual, BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, Input OVP Vin (min) (V) 3 Vin (max) (V) 18 Absolute max Vin (max) (V) 40 Control topology Linear Battery charge voltage (min) (V) 3.5 Battery charge voltage (max) (V) 8.4 Control interface Standalone (RC-Settable) Operating temperature range (°C) -40 to 125
Rating Automotive Number of series cells 1, 2, 3, 4, 5, 6 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4, NiMH Charge current (max) (A) 0.8 Features AEC-Q100 Automotive Qual, BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, Input OVP Vin (min) (V) 3 Vin (max) (V) 18 Absolute max Vin (max) (V) 40 Control topology Linear Battery charge voltage (min) (V) 3.5 Battery charge voltage (max) (V) 8.4 Control interface Standalone (RC-Settable) Operating temperature range (°C) -40 to 125
VSON (DRC) 10 9 mm² 3 x 3
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C ≤ TA ≤ 125°C
    • HBM ESD classification level 2
    • CDM ESD classification level C4B
  • 40-V load-dump tolerant to support charging back-up battery directly from main battery, 3-V to 18-V operating
  • Automatic Sleep Mode for low power consumption
    • 350-nA battery leakage current
    • 2-µA input leakage current when charge disabled
  • Support multi-chemistry battery
    • 1- to 2-cell Li-Ion, Li-Poly, and LiFePO4
    • 1- to 6-cell NiMH with intermittent-charging support
  • External resistor programmable operation
    • VSET to set battery regulation voltage from 3.5 V to 8.4 V for Li-Ion, or 1- to 6-cell for NiMH
    • ISET to set charge current from 10 mA to 800 mA
    • CHM_TMR to set battery chemistry as Li+ or NiMH, and charge timer duration
  • High accuracy
    • ±0.5% charge voltage accuracy
    • ±10% charge current accuracy
  • Charging features
    • Precharge current 20% of ISET
    • Termination current 10% of ISET
    • NTC thermistor input to monitor battery temperature
    • CE pin for charging function control
    • Two Open-drain output for status and fault indication
  • Integrated fault protection
    • 18-V IN overvoltage protection
    • VSET based OUT overvoltage protection
    • 1000-mA overcurrent protection
    • 125°C thermal regulation; 150°C thermal shutdown protection
    • OUT short-circuit protection
    • VSET, ISET, CHM_TMR pins short/open protection
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C ≤ TA ≤ 125°C
    • HBM ESD classification level 2
    • CDM ESD classification level C4B
  • 40-V load-dump tolerant to support charging back-up battery directly from main battery, 3-V to 18-V operating
  • Automatic Sleep Mode for low power consumption
    • 350-nA battery leakage current
    • 2-µA input leakage current when charge disabled
  • Support multi-chemistry battery
    • 1- to 2-cell Li-Ion, Li-Poly, and LiFePO4
    • 1- to 6-cell NiMH with intermittent-charging support
  • External resistor programmable operation
    • VSET to set battery regulation voltage from 3.5 V to 8.4 V for Li-Ion, or 1- to 6-cell for NiMH
    • ISET to set charge current from 10 mA to 800 mA
    • CHM_TMR to set battery chemistry as Li+ or NiMH, and charge timer duration
  • High accuracy
    • ±0.5% charge voltage accuracy
    • ±10% charge current accuracy
  • Charging features
    • Precharge current 20% of ISET
    • Termination current 10% of ISET
    • NTC thermistor input to monitor battery temperature
    • CE pin for charging function control
    • Two Open-drain output for status and fault indication
  • Integrated fault protection
    • 18-V IN overvoltage protection
    • VSET based OUT overvoltage protection
    • 1000-mA overcurrent protection
    • 125°C thermal regulation; 150°C thermal shutdown protection
    • OUT short-circuit protection
    • VSET, ISET, CHM_TMR pins short/open protection

The BQ25171-Q1 is an automotive rated, 800-mA linear charger for 1-cell and 2-cell Li-Ion, Li-Polymer, and LiFePO4, in addition to 1-cell up to 6-cell NiMH battery applications.The device has a single power output that charges the battery. The system load can be placed in parallel with the battery, as long as the average system load does not prevent the battery from charging fully within the safety timer duration. When the system load is placed in parallel with the battery, the charge current is shared between the system and the battery.

The device has three phases for charging a Li-Ion battery: precharge to recover a fully discharged battery, fast-charge constant current to supply the bulk of the charge, and voltage regulation to reach full capacity.

The device charges a NiMH in constant current mode only, and terminates the charge cycle when the programmable timer expires or the battery voltage exceeds the VOUT_OVP threshold.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 BQ25171-Q1 is an automotive rated, 800-mA linear charger for 1-cell and 2-cell Li-Ion, Li-Polymer, and LiFePO4, in addition to 1-cell up to 6-cell NiMH battery applications.The device has a single power output that charges the battery. The system load can be placed in parallel with the battery, as long as the average system load does not prevent the battery from charging fully within the safety timer duration. When the system load is placed in parallel with the battery, the charge current is shared between the system and the battery.

The device has three phases for charging a Li-Ion battery: precharge to recover a fully discharged battery, fast-charge constant current to supply the bulk of the charge, and voltage regulation to reach full capacity.

The device charges a NiMH in constant current mode only, and terminates the charge cycle when the programmable timer expires or the battery voltage exceeds the VOUT_OVP threshold.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.
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* Data sheet BQ25171-Q1: Automotive, Standalone 800-mA Linear Battery Charger for 1- to 2-Cell Li-Ion, LiFePO4, and 1- to 6-Cell NiMH datasheet (Rev. A) PDF | HTML 29 Mar 2021
White paper 解決 Nano IQ 系統的性能挑戰 (Rev. A) PDF | HTML 25 Mar 2024
White paper 나노-IQ 시스템의 성능 문제 해결 (Rev. A) PDF | HTML 25 Mar 2024
White paper Addressing Performance Challenges in Nano-IQ Systems (Rev. A) PDF | HTML 11 Mar 2024
Application note Wireless Power Solutions for Battery Chargers PDF | HTML 20 Apr 2023
Application note Multi-Chemistry Charger in Low Battery Power Applications PDF | HTML 17 Nov 2022
Application note BQ25171-Q1 Quick Start Guide PDF | HTML 29 Sep 2021

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

BQ25171EVM — BQ25171 evaluation module 800-mA linear battery charger for 1-2-cell Li-ion, LiFePO4, 1-6-cell NiMH

The BQ25171EVM evaluation module (EVM) is designed to help the user evaluate and test the various operating modes of the BQ25171 device.
User guide: PDF
Not available on TI.com
Reference designs

PMP30963 — Backup battery reference design with preboost, charger and 1S Li-ion fuel gauge

This design shows an automotive backup battery using a 1S Li-ion battery for emergency operation. The primary power input is rated for 6-V to 18-V nominal (2.7-V to 36-V peak) to comply with 12-V automotive requirements. The secondary power input has a fuel gauge to monitor a single cell Li-ion (...)
Test report: PDF
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VSON (DRC) 10 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

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