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BQ24251

NOT RECOMMENDED FOR NEW DESIGNS

2A Single Input I2C/Standalone Switch-Mode Li-Ion Battery Charger

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Data sheet
BQ24251 is not recommended for new designs
Although this product continues to be in production to support previous designs, we don't recommend it for new designs. Consider one of these alternates:
open-in-new Compare alternates
Pin-for-pin with same functionality to the compared device
BQ25611D ACTIVE I2C controlled 1-cell 3-A buck battery charger with USB detection and 1.2-A boost operation Support USB detection, low quiencent current and flexible JEITA for various battery
Similar functionality to the compared device
BQ25600 ACTIVE I2C 1cell 3A Buck battery charger with power path and OTG in WCSP This product is 3A, 1S I2C switching charger with OTG support and WCSP Package

BQ24251

NOT RECOMMENDED FOR NEW DESIGNS
Data sheet Order now

Product details

Number of series cells 1 Charge current (max) (A) 2 Vin (max) (V) 18 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 3.5 Battery charge voltage (max) (V) 4.44 Absolute max Vin (max) (V) 22 Control topology Switch-Mode Buck Control interface I2C, Standalone (RC-Settable) Features BAT temp thermistor monitoring (JEITA profile), Power Path, USB D+/D-/BC1.2 integrated Vin (min) (V) 4.35 Rating Catalog Operating temperature range (°C) -40 to 85
Number of series cells 1 Charge current (max) (A) 2 Vin (max) (V) 18 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 3.5 Battery charge voltage (max) (V) 4.44 Absolute max Vin (max) (V) 22 Control topology Switch-Mode Buck Control interface I2C, Standalone (RC-Settable) Features BAT temp thermistor monitoring (JEITA profile), Power Path, USB D+/D-/BC1.2 integrated Vin (min) (V) 4.35 Rating Catalog Operating temperature range (°C) -40 to 85
DSBGA (YFF) 30 5.71999999999999912 mm² 2.2 x 2.5999999999999996 VQFN (RGE) 24 16 mm² 4 x 4
  • 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
  • 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

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.

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
* Data sheet bq2425x 2A Single-Input I2C, Stand-Alone Switched-Mode Li-Ion Battery Charger With Power-Path Management datasheet (Rev. H) PDF | HTML 20 Aug 2015
Technical article Portable speaker power: Making the bass possible PDF | HTML 12 May 2015
Analog Design Journal Battery-charging considerations for high-power portable devices 11 Apr 2014
Application note Building your own Battery Simulator 14 Oct 2013
Application note Using bq2425x’s DPM Feature for Solar Panel Applications 31 Jul 2013
Application note Selecting the Best bq2425x Single Cell I2C, Standalone Switch-Mode Battery Charg 17 Jun 2013
User guide bq24257EVM-150, Single-Cell Li-Ion Switch-Mode Charger (Rev. A) 03 Apr 2013

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