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Product details

Parameters

Number of series cells 1 Charge current (Max) (A) 1.25 Operating Vin (Max) (V) 6 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (Min) (V) 3.5 Battery charge voltage (Max) (V) 4.44 Absolute Vin (safety rating) (Max) ((V)) 20 Control topology Switch-Mode Buck Control interface I2C Features BAT temp thermistor monitoring (hot/cold profile), USB OTG integrated Operating Vin (Min) (V) 4 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

DSBGA (YFF) 20 0 mm² 2.182 x 2.04 open-in-new Find other Battery charger ICs

Features

  • Integrated Power FETs for up to 1.55-A Charge
    Rate
  • Spread Spectrum Frequency Control for Improved
    EMI Performance
  • High-Accuracy Voltage and Current Regulation
    • Input Current Regulation Accuracy:
      ±5% (100 mA and 500 mA)
    • Charge Voltage Regulation Accuracy:
      ±0.5% (25°C), ±1% (0°C to 125°C)
    • Charge Current Regulation Accuracy: ±5%
  • Factory Test-Mode for GSM Calibration Without a
    Battery
  • Input Voltage Based Dynamic Power
    Management (VIN DPM)
  • Bad Adaptor Detection and Rejection
  • Safety Limit Register for Maximum Charge
    Voltage and Current Limiting
  • High-Efficiency Mini-USB/AC Battery Charger for
    Single-Cell Li-Ion and Li-Polymer Battery Packs
  • 20-V Absolute Maximum Input Voltage Rating
  • 6.5-V Maximum Operating Input Voltage
  • Programmable Charge Parameters through I2C
    Compatible Interface (up to 3.4 Mbps):
    • Input Current Limit
    • VIN DPM Threshold
    • Fast-Charge/Termination Current
    • Charge Regulation Voltage (3.5 to 4.44 V)
    • Low Charge Current Mode Enable/Disable
    • Termination Enable/Disable
  • Synchronous Fixed-Frequency PWM Controller
    Operating at 3 MHz With 0% to 99.5% Duty Cycle
  • Automatic High Impedance Mode for Low Power
    Consumption
  • Robust Protection
    • Reverse Leakage Protection Prevents Battery
      Drainage
    • Thermal Regulation and Protection
    • Input/Output Overvoltage Protection
  • Status Output for Charging and Faults
  • USB Friendly Boot-Up Sequence
  • Automatic Charging
  • Power Up System Without Battery
  • Boost Mode Operation for USB OTG:
    • Input Voltage Range (from Battery):
      3.2 to 4.5 V
    • Output for VBUS: 5.05 V, 350 mA
  • 2.1 × 2.0-mm, 20-Pin DSBGA Package
  • Pin-to-Pin Compatible With bq24157 and bq24158
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Description

The bq24157S is a compact, flexible, high-efficiency, USB-friendly switch-mode charge management device for single-cell Li-ion and Li-polymer batteries used in a wide range of portable applications. The charge parameters can be programmed through an I2C interface. The IC integrates a synchronous PWM controller, power MOSFETs, input current sensing, high-accuracy current and voltage regulation, and charge termination, into a small DSBGA package.

The IC charges the battery in three phases: conditioning, constant current, and constant voltage. The input current is automatically limited to the value set by the host.

Charge is terminated based on battery voltage and user-selectable minimum current level. During normal operation, the IC automatically restarts the charge cycle if the battery voltage falls below an internal threshold and automatically enters sleep mode or high impedance mode when the input supply is removed. The charge status can be reported to the host using the I2C interface. During the charging process, the IC monitors its junction temperature (TJ) and reduces the charge current after TJ increases to about 125°C. To support a USB OTG device, bq24157S can provide VBUS (5.05 V) by boosting the battery voltage. The IC is available in 20-pin DSBGA 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 5
Type Title Date
* Datasheet bq24157S 1.55-A Fully Integrated Switch-Mode One-Cell Li-Ion Charger With Full USB Compliance and USB-OTG Support datasheet (Rev. B) May 05, 2015
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
Application note Building your own Battery Simulator Oct. 14, 2013

Design & development

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

Hardware development

EVALUATION BOARD Download
99
Description
The BQ24157EVM-697 evaluation module is a complete charger module for evaluating compact, flexible, high-efficiency, USB-friendly, switch-mode charge management solution for single-cell Li-ion and Li-polymer batteries used in a wide range of portable applications. The bq24157 integrates a (...)
Features
  • High-efficiency fully integrated NMOS-NMOS synchronous buck charger with 3-MHz frequency.
  • Integrated power FETs for up to 1.55-A charge rate.
  • Programmable battery voltage, charge current, and input current via I2C™ interface.
  • Boost-mode operation for USB OTG.
  • LED indication for status signals.
  • Test points (...)

Software development

DRIVER OR LIBRARY Download
Linux Driver for BQ2415X
BQ2415XSW-LINUX The Linux driver supports the BQ2415x series of Fully Integrated Switch-Mode One-Cell Li-Ion Chargers. The Linux driver supports communication through the I2C bus and interfaces with the power supply sub-system.

 

Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

(...)

CAD/CAE symbols

Package Pins Download
DSBGA (YFF) 20 View options

Ordering & quality

Information included:
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  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Support & training

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