BQ24251 is not recommended for new designs.
This product continues to be in production to support existing customers. Please consider one of these alternatives:
open-in-new Compare products
Similar but not functionally equivalent to the compared device:
BQ25600 ACTIVE I2C controlled single cell 3-A Fast charger with High input voltageand Power Path This product is 3A, 1S I2C switching charger with OTG support and WCSP Package
BQ25601 ACTIVE I2C controlled single cell 3-A battery charger with high input voltage, Power Path, and D+/D- This product is 3A, 1S I2C switching charger with OTG support and WQFN Package
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Product details

Parameters

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Features

  • High-Efficiency Switched-Mode Charger With
    Separate Power Path
  • Startup System From Deeply Discharged or
    Missing Battery
  • USB Charging Compliant
    • Selectable Input Current Limit of 100 mA,
      500 mA, 900 mA, 1.5 A, and 2 A
  • BC1.2 Compatible D+, D– Detection
  • In Host Mode (After I2C Communication Starts
    and Before Watchdog Timer Times Out)
    • Programmable Battery Charge Voltage,
      VBATREG
    • Programmable Charge Current (ICHG)
    • Programmable Input Current Limit (ILIM)
    • Programmable Input Voltage-Based Dynamic
      Power Management Threshold, (VIN_DPM)
    • Programmable Input Overvoltage Protection
      Threshold (VOVP)
    • Programmable Safety Timer
  • Resistor Programmable Defaults for:
    • ICHG up to 2 A With Current Monitoring Output
      (ISET)
    • ILIM up to 2 A With Current Monitoring Output
      (ILIM)
    • VIN_DPM (VDPM)
  • Watchdog Timer Disable Bit
  • Integrated 4.9 V, 50 mA LDO
  • Complete System-Level Protection
    • Input UVLO, Input Overvoltage Protection
      (OVP), Battery OVP, Sleep Mode, VIN_DPM
    • Input Current Limit
    • Charge Current Limit
    • Thermal Regulation
    • Thermal Shutdown
    • Voltage-Based, JEITA Compatible NTC
      Monitoring Input
    • Safety Timer
  • 22 V Absolute Maximum Input Voltage Rating
  • 10.5 V Maximum Operating Input Voltage
  • Low RDS(on) Integrated Power FETs for a Charging
    Rate of up to 2 A
  • Open-Drain Status Outputs
  • Synchronous Fixed-Frequency PWM Controller
    Operating at 3 MHz for Small Inductor Support
  • AnyBoot Robust Battery Detection Algorithm
  • Charge Time Optimizer for Improved Charge
    Times at Any Given Charge Current
  • 2.40-mm × 2.00-mm 30-Ball DSBGA and 4-mm ×
    4-mm 24-Pin QFN Packages
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Description

The bq24250, bq24251, and bq24253 are highly integrated single-cell Li-Ion battery chargers and system power-path management devices targeted for space-limited, portable applications with high-capacity batteries. The single-cell charger has a single input that operates from either a USB port or an AC wall adapter for a versatile solution.

The power-path management feature allows the bq24250, bq24251, and bq24253 to power the system from a high-efficiency DC-DC converter while simultaneously and independently charging the battery. The charger monitors the battery current at all times and reduces the charge current when the system load requires current above the input current limit. This reduced charge current allows for proper charge termination and enables the system to run with a defective or absent battery pack. Additionally, this reduced charge current enables instant system turnon even with a totally discharged battery or no battery. The architecture of the power-path management also permits the battery to supplement the system current requirements when the adapter cannot deliver the peak system currents. This supplementation of current requirements enables the use of a smaller adapter.

The battery is charged in four phases: trickle charge, precharge, 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. Additionally, a voltage-based, JEITA compatible battery pack thermistor monitoring input (TS) that monitors battery temperature for safe charging is included.

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Technical documentation

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Type Title Date
* Datasheet bq2425x 2A Single-Input I2C, Stand-Alone Switched-Mode Li-Ion Battery Charger With Power-Path Management datasheet (Rev. H) Aug. 20, 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 Portable speaker power: Making the bass possible May 12, 2015
Technical articles Summertime and the livin' is easy Jun. 20, 2014
Application notes Battery-charging considerations for high-power portable devices Apr. 11, 2014
Application notes Building your own Battery Simulator Oct. 14, 2013
Application notes Using bq2425x’s DPM Feature for Solar Panel Applications Jul. 31, 2013
Application notes Selecting the Best bq2425x Single Cell I2C, Standalone Switch-Mode Battery Charg Jun. 17, 2013
User guides bq24257EVM-150, Single-Cell Li-Ion Switch-Mode Charger (Rev. A) Apr. 03, 2013

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
$149.00
Description

This EVM enables test and evaluation of the Texas Instruments' bq24250/51/57 devices. The bq2425x series are highly integrated single cell Li-Ion battery chargers targeted for space-limited, portable applications with high capacity batteries. The single cell charger has a single input that operates (...)

Features
  • High-efficiency switch-mode charger
  • Synchronous fixed-frequency PWM controller operating at 3MHz for small inductor support
  • USB charging compliant
  • Integrated 50mA LDO
  • Integrated power FETs for up to 2.0A charging rate
  • Complete system level protection
  • BC1.2 D+/D- detection with dead battery provision (DBP (...)
EVALUATION BOARDS Download
document-generic User guide
$149.00
Description

This EVM enables test and evaluation of the Texas Instruments' bq24251 device. The bq2425x series are highly integrated single cell Li-Ion battery chargers targeted for space-limited, portable applications with high capacity batteries. The single cell charger has a single input that operates from (...)

Features
  • High-efficiency switch-mode charger
  • Synchronous fixed-frequency PWM controller operating at 3MHz for small inductor support
  • USB charging compliant
  • Integrated 50mA LDO
  • Integrated power FETs for up to 2.0A charging rate
  • Complete system level protection
  • BC1.2 D+/D- detection with dead battery provision (DBP (...)

Software development

DRIVERS & LIBRARIES Download
Linux Driver for BQ2425x
BQ24257SW-LINUX The Linux driver supports the BQ2425x Switch-Mode Li-Ion Battery Charger. 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

Supported Devices:

  • bq24257
  • (...)
SUPPORT SOFTWARE Download
SLUC435A.ZIP (528 KB)

CAD/CAE symbols

Package Pins Download
DSBGA (YFF) 30 View options
VQFN (RGE) 24 View options

Ordering & quality

Support & training

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