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BQ25171-Q1 ACTIVE Automotive, 800-mA linear battery charger for 1- to 2-cell Li-ion, LiFePO4, and 1- to 6-cell NiMH This product is an automotive 800-mA Linear Battery Charger for single and multicell Li-ion, LiFePO4 and NiMH

Product details

Number of series cells 1 Charge current (max) (A) 1.5 Vin (max) (V) 6.4 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 4.2 Battery charge voltage (max) (V) 4.2 Absolute max Vin (max) (V) 28 Control topology Linear Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, Input OVP, Power Path, VINDPM (Input voltage threshold to maximize adaptor power) Vin (min) (V) 4.35 Rating Automotive Operating temperature range (°C) -40 to 125
Number of series cells 1 Charge current (max) (A) 1.5 Vin (max) (V) 6.4 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 4.2 Battery charge voltage (max) (V) 4.2 Absolute max Vin (max) (V) 28 Control topology Linear Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, Input OVP, Power Path, VINDPM (Input voltage threshold to maximize adaptor power) Vin (min) (V) 4.35 Rating Automotive Operating temperature range (°C) -40 to 125
VQFN (RGT) 16 9 mm² 3 x 3
  • Qualified for Automotive Applications
  • AEC-Q100 Qualified with the following results
    • Device Temperature Grade 1: –40°C to
      +125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level H2
    • Device CDM ESD Classification Level C3B
  • Fully Compliant USB Charger
    • Selectable 100mA and 500mA Maximum Input Current
    • 100mA Maximum Current Limit Ensures Compliance to USB-IF Standard
    • Input based Dynamic Power Management (VIN-DPM)
      for Protection Against Poor USB Sources
  • 28V Input Rating with Overvoltage Protection
  • Integrated Dynamic Power Path Management (DPPM) Function
    Simultaneously and Independently Powers the System and
    Charges the Battery
  • Supports up to 1.5A Charge Current with Current Monitoring Output (ISET)
  • Programmable Input Current Limit up to 1.5A for Wall Adapters
  • Battery Disconnect Function with SYSOFF Input
  • Programmable Pre-Charge and Fast-Charge Safety Timers
  • Reverse Current, Short-Circuit and Thermal Protection
  • NTC Thermistor Input
  • Proprietary Start Up Sequence Limits Inrush Current
  • Status Indication – Charging/Done, Power Good
  • Small 3 mm × 3 mm 16 Lead QFN Package
  • Qualified for Automotive Applications
  • AEC-Q100 Qualified with the following results
    • Device Temperature Grade 1: –40°C to
      +125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level H2
    • Device CDM ESD Classification Level C3B
  • Fully Compliant USB Charger
    • Selectable 100mA and 500mA Maximum Input Current
    • 100mA Maximum Current Limit Ensures Compliance to USB-IF Standard
    • Input based Dynamic Power Management (VIN-DPM)
      for Protection Against Poor USB Sources
  • 28V Input Rating with Overvoltage Protection
  • Integrated Dynamic Power Path Management (DPPM) Function
    Simultaneously and Independently Powers the System and
    Charges the Battery
  • Supports up to 1.5A Charge Current with Current Monitoring Output (ISET)
  • Programmable Input Current Limit up to 1.5A for Wall Adapters
  • Battery Disconnect Function with SYSOFF Input
  • Programmable Pre-Charge and Fast-Charge Safety Timers
  • Reverse Current, Short-Circuit and Thermal Protection
  • NTC Thermistor Input
  • Proprietary Start Up Sequence Limits Inrush Current
  • Status Indication – Charging/Done, Power Good
  • Small 3 mm × 3 mm 16 Lead QFN Package

The bq24075-Q1 device is integrated Li-ion linear charger and system power path management device targeted at space-limited portable applications. The device operate from either a USB port or AC adapter and support charge currents up to 1.5A. The input voltage range with input overvoltage protection supports unregulated adapters. The USB input current limit accuracy and start up sequence allow the bq24075-Q1 to meet USB-IF inrush current specification. Additionally, the input dynamic power management (VIN-DPM) prevents the charger from crashing incorrectly configured USB sources.

The bq24075-Q1 features dynamic power path management (DPPM) that powers the system while simultaneously and independently charging the battery. The DPPM circuit reduces the charge current when the input current limit causes the system output to fall to the DPPM threshold; thus, supplying the system load at all times while monitoring the charge current separately. This feature reduces the number of charge and discharge cycles on the battery, allows for proper charge termination and enables the system to run with a defective or absent battery pack.

Additionally, the regulated system input enables instant system turn-on when plugged in even with a totally discharged battery. The power-path management architecture also permits the battery to supplement the system current requirements when the adapter cannot deliver the peak system currents, enabling the use of a smaller adapter.

The battery is charged in three phases: conditioning, constant current, and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if the internal temperature threshold is exceeded. The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and charge termination. The input current limit and charge current are programmable using external resistors.

The bq24075-Q1 device is integrated Li-ion linear charger and system power path management device targeted at space-limited portable applications. The device operate from either a USB port or AC adapter and support charge currents up to 1.5A. The input voltage range with input overvoltage protection supports unregulated adapters. The USB input current limit accuracy and start up sequence allow the bq24075-Q1 to meet USB-IF inrush current specification. Additionally, the input dynamic power management (VIN-DPM) prevents the charger from crashing incorrectly configured USB sources.

The bq24075-Q1 features dynamic power path management (DPPM) that powers the system while simultaneously and independently charging the battery. The DPPM circuit reduces the charge current when the input current limit causes the system output to fall to the DPPM threshold; thus, supplying the system load at all times while monitoring the charge current separately. This feature reduces the number of charge and discharge cycles on the battery, allows for proper charge termination and enables the system to run with a defective or absent battery pack.

Additionally, the regulated system input enables instant system turn-on when plugged in even with a totally discharged battery. The power-path management architecture also permits the battery to supplement the system current requirements when the adapter cannot deliver the peak system currents, enabling the use of a smaller adapter.

The battery is charged in three phases: conditioning, constant current, and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if the internal temperature threshold is exceeded. The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and charge termination. The input current limit and charge current are programmable using external resistors.

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Technical documentation

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Type Title Date
* Data sheet 1.5-A USB-Friendly Li-Ion Battery Charger and Power-Path Management IC datasheet (Rev. B) 07 Mar 2012
White paper Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) PDF | HTML 30 Apr 2024
User guide bq24072/3/4/5/9(T) and bq24230/2 1.5-A Single-Chip Li-Ion (Rev. E) 03 Jan 2017
Application note Selecting the Best bq2407x/23x Single Cell Battery Charger for your Application 08 Nov 2012

Design & development

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Evaluation board

BQ24075EVM — BQ24075 Evaluation Module

This user’s guide describes the bq24072/3/4/5/9(T) and bq24230/2 (bqTiny-III™) evaluation module (EVM). The EVM provides a convenient method for evaluating the performance of a charge management and system power solution for portable applications using the bq24072/3/4/5/9(T) and (...)

User guide: PDF
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Linear Charger NTC Calculator

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VQFN (RGT) 16 Ultra Librarian

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