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Product details

Parameters

Number of series cells 1 Charge current (Max) (A) 1.55 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 Input OVP, USB OTG integrated, VINDPM (Input voltage threshold to maximize adaptor power) 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

  • Power Up System without Battery
  • Charge Faster than Linear Chargers
  • 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%
  • 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
  • Built-In Input Current Sensing and Limiting
  • Integrated Power FETs for Up To 1.55-A Charge Rate
  • 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 V to 4.44 V)
    • Low Charge Current Mode Enable/Disable
    • Termination Enable/Disable
  • Support up to 1.55A Charge Current using 55 mΩ Sensing Resistor
  • 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
  • Boost Mode Operation for USB OTG
    • Input Voltage Range (from Battery): 3.2 V to 4.5 V
  • 2.1 mm x 2 mm 20-Pin WCSP Package

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Description

The bq24157 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 WCSP 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. A safety timer with reset control provides a safety backup for I2C interface. 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 once TJ increases to about 125°C. To support USB OTG device, bq24157 can provide VBUS (5.05 V) by boosting the battery voltage. The IC is available in 20-pin WCSP 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 8
Type Title Date
* Datasheet bq24157 Fully Integrated Switch-Mode Charger With USB Compliance and USB-OTG Support datasheet (Rev. E) Jan. 03, 2018
Technical articles When to use rechargeable batteries in small battery applications Oct. 01, 2019
Application notes Battery Charger Overload Protection in Boost Mode Operation Jul. 12, 2017
Application notes Achieving the Optimal Thermal Performance for Chip Scale Package Jan. 10, 2017
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 bq24153A/56A/57/58/59EVM Fully Integrated, Switch-Mode, One-Cell, Li-Ion Chgr (Rev. C) May 12, 2014
Application notes Building your own Battery Simulator Oct. 14, 2013

Design & development

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Hardware development

EVALUATION BOARDS Download
document-generic User guide
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 (...)

CAD/CAE symbols

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DSBGA (YFF) 20 View options

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