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Product details

Parameters

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) 4.2, 8.4, 12.6 Battery charge voltage (Max) (V) 4.2, 8.4, 12.6 Absolute Vin (safety rating) (Max) ((V)) 20 Control topology Switch-Mode Buck Control interface Standalone (RC-Settable) Features Input OVP, Power Path, BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation 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

Features

  • 1.6-MHz Synchronous Switched-Mode Charger
    with 4-A Integrated N-MOSFETs
  • Up to 94% Efficiency
  • 30-V Input Rating with Adjustable Overvoltage
    Protection
    • 4.5-V to 17-V Input Operating Voltage Range
  • Battery Charge Voltage
    • bq24170: 1-, 2-, or 3-Cell with 4.2 V/Cell
    • bq24172: Adjustable Charge Voltage
  • High Integration
    • Automatic Power Path Selector Between
      Adapter and Battery
    • Dynamic Power Management
    • Integrated 20-V Switching MOSFETs
    • Integrated Bootstrap Diode
    • 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
    • Adjustable Input Overvoltage Protection
    • Cycle-by-Cycle Current Limit
  • Accuracy
    • ±0.5% Charge Voltage Regulation
    • ±4% Charge Current Regulation
    • ±4% Input Current Regulation
  • <15-µA Battery Current With Adapter Removed
  • <1.5-mA Input Current With Adapter Present and
    Charge Disabled
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Description

The bq2417x device is a 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 bq2417x closely monitors the battery pack temperature to allow charge only in a preset temperature window. The bq24170 charges one, two, or three cells (selected by CELL pin), and the bq24172 is adjustable for up to three series Li+ cells.

The device charges the battery in three phases: precondictioning, constant current, and constant voltage.

Charge is terminated when the current reaches 10% of the fast charge rate. A programmable charge timer offers a safety backup. The bq2417x 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 bq2417x 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 bq2417x 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 bq2417x charges a battery from a DC source as high as 17 V, including a car battery. The input overvoltage limit is adjustable through the OVPSET pin. The AVCC, ACP, and ACN pins have a 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 bq2417x is available in a 24-pin, 5.5-mm × 3.5-mm thin VQFN package.

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Technical documentation

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Type Title Date
* Datasheet bq2417x 1.6-MHz Synchronous Switched-Mode Li-Ion and Li-Polymer Stand-Alone Battery Charger With Integrated MOSFETs and Power Path Selector datasheet (Rev. C) Apr. 30, 2015
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 Understanding battery charger features and charging topologies Sep. 19, 2016
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 bq24170EVM Evaluation Module Nov. 12, 2010

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$99.00
Description

The Texas Instruments BQ24170EVM-610-15V (-002) evaluation module helps designers evaluate the operation and performance of the bq24170 synchronous battery charger. The EVM is also called the HPA610 (-002). This EVM is optimized for a 12V or 15V input voltage and charges between 1 and 3 cell Li-Ion (...)

Features
  • Evaluation module for bq24170
  • Stand-alone synchronous switch-mode, battery-charge controller
  • Integrated N-MOSFETs and power path selector
  • CELL pin setting to select between 1, 2, or 3 Li-ion batteries with 4.2V/cell
  • Input operating range: 6 V to 18 V
  • LED indication for charge status
  • Test points for key (...)
EVALUATION BOARDS Download
document-generic User guide
$99.00
Description

The Texas Instruments BQ24170EVM-610-5V (-001) evaluation module helps designers evaluate the operation and performance of the bq24170 synchronous battery charger. The EVM is also called the HPA610 (-001). This EVM is optimized for a 5V input voltage and charges a single cell 4.2V Li-ion battery (...)

Features
  • Evaluation module for bq24170
  • Stand-alone synchronous switch-mode, battery-charge controller
  • Integrated N-MOSFETs and power path selector
  • CELL pin setting up to 12.6-V battery voltage; 1, 2, or 3 cells with 4.2 V/cell
  • Input operating range: 4.5 V to 8 V
  • LED indication for charge status
  • Test points for key (...)

Reference designs

REFERENCE DESIGNS Download
1.6MHz Synchronous Switch-Mode Li-Ion/Li-Polymer Stand-Alone Battery Charger Reference Design
TIDA-00027 This reference design is highly integrated stand-alone Li-ion and Li-polymer switch-mode battery charge solution with two integrated N-channel power MOSFETs and a power path selector gate driver. It offers a constant-frequency synchronous PWM controller with high accuracy regulation of input (...)
document-generic User guide
REFERENCE DESIGNS Download
1.6-MHz Synchronous Switch-Mode Li-Ion and Li-Polymer Stand-alone 4A Battery Charger Ref Design
TIDA-00028 This reference design is highly integrated stand-alone Li-ion and Li-polymer switch-mode battery charge solution with two integrated N-channel power MOSFETs and a power path selector gate driver. It offers a constant-frequency synchronous PWM controller with high accuracy regulation of input (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Programmable, Multi-Chemistry Fast Charge Management Reference Design
TIDA-00026 This reference design is a programmable, monolithic IC solution for fast-charge management of nickel cadmium (NiCd), nickel metal-hydride (NiMH), or lithium-ion (Li-Ion) batteries in single- or multi-chemistry applications. It chooses the proper battery chemistry (either nickel or lithium) and (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VQFN (RGY) 24 View options

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