Product details


Number of series cells 1, 2, 3 Charge current (Max) (A) 4 Operating Vin (Max) (V) 17 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (Min) (V) 2.1 Battery charge voltage (Max) (V) 15.5 Absolute Vin (safety rating) (Max) ((V)) 20 Control topology Switch-Mode Buck Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (JEITA profile), BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, IINDPM (Input current limit), Input OVP, Power Path Operating Vin (Min) (V) 4.5 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

VQFN (RGY) 24 19 mm² 5.5 x 3.5 open-in-new Find other Battery charger ICs


  • JEITA-Compatible Battery Temperature Sensing
  • 1.6-MHz Synchronous Switched-Mode Charger
    With 4-A Integrated N-MOSFETs
  • Up to 94% Efficiency
  • 30-V Input Rating With Adjustable Overvoltage
    • 4.5-V to 17-V Input Operating Voltage
  • Battery Charge Voltage
    • Adjustable Charge Voltage up to 3-Series
  • High Integration
    • Automatic Power Path Selector Between
      Adapter and Battery
    • Dynamic Power Management
    • Integrated 20-V Switching MOSFETs
    • Integrated Bootstrap Diode
    • Internal Loop Compensation
    • Internal Digital Soft Start
  • Safety
    • Thermal Regulation Loop Throttles Back
      Current to Limit TJ = 120°C
    • Thermal Shutdown
    • Battery Thermistor Sense Hot/Cold Charge
      Suspend and Battery Detect
    • Input Overvoltage Protection With
      Programmable Threshold
    • Cycle-by-Cycle Current Limit
  • Accuracy
    • ±0.5% Charge Voltage Regulation
    • ±4% Charge Current Regulation
    • ±4% Input Current Regulation
  • Less Than 15-µA Battery Current With Adapter
  • Less Than 1.5-mA Input Current With Adapter
    Present and Charge Disabled
  • Small QFN Package
    • 24-Pin, 5.5-mm × 3.5-mm QFN Package
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The bq24171 device is highly integrated stand-alone Li-ion and Li-polymer switched-mode battery charger with two integrated N-channel power MOSFETs. The device offers a constant-frequency synchronous PWM controller with high-accuracy regulation of input current, charge current, and voltage. The bq24171 closely monitors the battery pack temperature and allows charge only in a JEITA profile-compatible window with a lower charge rate at a low temperature and a lower charge voltage at a high temperature. The bq24171 device charges the battery in three phases: preconditioning, constant current, and constant voltage. The bq24171 charges up to 3-series cells with an adjustable cell voltage.

The bq24171 charges the battery in three phases: preconditioning, constant current, and constant voltage. The device is adjustable for up to three series Li+ cells.

Charge is terminated when the current reaches 10% of the fast charge rate. A programmable charge timer offers a safety backup. The bq24171 automatically restarts the charge cycle if the battery voltage falls below an internal threshold, and enters a low-quiescent current sleep mode when the input voltage falls below the battery voltage.

The bq24171 features Dynamic Power Management (DPM) to reduce the charge current when the input power limit is reached to avoid overloading the adapter. A highly accurate current-sense amplifier enables precise measurement of input current from adapter to monitor overall system power.

The bq24171 device provides power path selector gate driver ACDRV/CMSRC on input NMOS pair ACFET (Q1) and RBFET (Q2), and BATDRV on a battery PMOS device (Q3). When the qualified adapter is present, the system is directly connected to the adapter. Otherwise, the system is connected to the battery. In addition, the power path prevents battery from boosting back to the input.

The bq24171 charges battery from DC source as high as 17 V, including car battery. The input overvoltage limit is adjustable through the OVPSET pin. The AVCC, ACP and ACN pins are 30-V rating. When a high-voltage DC source is inserted, Q1 and Q2 remain off to avoid high voltage damage to the system.

For 1-cell applications, if the battery is not removable, the system can be directly connected to the battery to simplify the power path design and reduce the cost. With this configuration, the battery can automatically supplement the system load if the adapter is overloaded.

The bq24171 is available in a 24-pin, 5.5-mm × 3.5-mm thin QFN package.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 6
Type Title Date
* Datasheet bq24171 JEITA-Compliant Stand-Alone, Switched-Mode Li-Ion and Li-Polymer Battery Charger With Integrated MOSFETs and Power Path Selector datasheet (Rev. C) Oct. 28, 2014
Application notes BQ241xx/BQ246xx Selection of Multi-Cell Standalone Switching Battery Chargers Dec. 31, 2019
Technical articles When to use rechargeable batteries in small battery applications Oct. 01, 2019
Technical articles Should I use a linear charger or a switching charger? Oct. 30, 2015
Technical articles Summertime and the livin' is easy Jun. 20, 2014
User guides bq24171EVM and bq24172EVM User's Guide (Rev. A) Feb. 22, 2011

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 Texas Instruments BQ24171EVM-706-15V (-003) evaluation module helps designers evaluate the operation and performance of the bq24171 synchronous battery charger. The EVM is also called the HPA706 (-003). This EVM is optimized for a 12V or 15V input voltage and charges between 1 and 3 cell Li-Ion (...)

  • Evaluation module for bq24171
  • Stand-alone synchronous switch-mode, battery-charge controller
  • Integrated N-MOSFETs and power path selector
  • Resistor-programmable up to 12.6-V battery voltage
  • Input operating range: 6v -18v
  • LED indication for charge status
  • Test points for key signals available for testing (...)

Design tools & simulation

SLUC244A.ZIP (895 KB)
SLUC235.ZIP (308 KB)

CAD/CAE symbols

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VQFN (RGY) 24 View options

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