Product details


Number of series cells 1, 2, 3, 4, 5, 6 Charge current (Max) (A) 0.8 Operating Vin (Max) (V) 18 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4, NiMH Battery charge voltage (Min) (V) 3.5 Battery charge voltage (Max) (V) 8.4 Absolute Vin (safety rating) (Max) ((V)) 40 Control topology Linear Control interface Standalone, Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, Input OVP Operating Vin (Min) (V) 3 Rating Automotive open-in-new Find other Battery charger ICs

Package | Pins | Size

VSON (DRC) 10 9 mm² 3 x 3 open-in-new Find other Battery charger ICs


  • 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

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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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Technical documentation

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Type Title Date
* 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) Mar. 29, 2021
User guide BQ25171EVM User's Guide (Rev. A) May 11, 2021
Technical article When to use rechargeable batteries in small battery applications Oct. 01, 2019
Technical article Should I use a linear charger or a switching charger? Oct. 31, 2015
Technical article Summertime and the livin' is easy Jun. 20, 2014

Design & development

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

Hardware development

document-generic User guide
The BQ25171EVM evaluation module (EVM) is designed to help the user evaluate and test the various operating modes of the BQ25171 device.
  • Complete solution for evaluation of the small form factor linear charger capable of providing up to 800 mA to a single li-ion or LiFePO4 battery
  • Popular configuration can be selected using the switches
  • Adjustments for charge current over a wide range along with TS sensing

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