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BQ25171-Q1
  • BQ25171-Q1
  • BQ25171-Q1

BQ25171-Q1

ACTIVE

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

Texas Instruments BQ25171-Q1 Product Info

1 April 2026 4

Parameters

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

Package

VSON (DRC)-10-9 mm² 3 x 3

Features

  • 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

Description

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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