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USB Friendly 0.5A Li+ Charger with Power-Path, 10.5V OVP


Package | PIN: RGT | 16
Temp: S (-5 to 125)
Carrier: Cut Tape
Qty Price
1-9 $2.65
10-24 $2.38
25-99 $2.21
100-249 $1.92
250-499 $1.78
500-749 $1.49
750-999 $1.22
1000+ $1.12


  • Fully Compliant USB Charger
    • Selectable 100-mA and 500-mA Maximum
      Input Current
    • 100-mA Maximum Current Limit Ensures
      Compliance to USB-IF Standard
    • Input-based Dynamic Power Management
      (VIN – DPM) for Protection Against Poor USB
  • 28-V Input Rating With Overvoltage Protection
  • Integrated Dynamic Power-Path Management
    (DPPM) Function Simultaneously and
    Independently Powers the System and Charges
    the Battery
  • Supports up to 500-mA Charge Current With
    Current Monitoring Output (ISET)
  • Programmable Input Current Limit up to 500 mA
    for Wall Adapters
  • Programmable Termination Current
  • Programmable Precharge and Fast-Charge Safety
  • Reverse Current, Short-Circuit, and Thermal
  • NTC Thermistor Input
  • Proprietary Start-Up Sequence Limits Inrush
  • Status Indication – Charging/Done, Power Good
  • Small 3 mm × 3 mm 16-Lead QFN Package

Texas Instruments  BQ24232HARGTR

The bq24232HA device is a highly integrated Li-ion linear charger and system power-path management device targeted at space-limited portable applications. The device operates from either a USB port or ac adapter and supports charge currents between 25 mA and 500 mA. The high-input-voltage range with input overvoltage protection supports low-cost, unregulated adapters. The USB input current limit accuracy and start-up sequence allow the bq24232HA to meet USB-IF inrush current specification. Additionally, the input dynamic power management (VIN – DPM) prevents the charger from crashing poorly designed or incorrectly configured USB sources.

The bq24232HA features dynamic power-path management (DPPM) that powers the system while simultaneously and independently charging the battery. The DPPM circuit reduces the charge current when the input current limit causes the system output to fall to the DPPM threshold, thus supplying the system load at all times while monitoring the charge current separately. This feature reduces the number of charge and discharge cycles on the battery, allows for proper charge termination, and enables the system to run with a defective or absent battery pack. Additionally, this enables instant system turn-on even with a totally discharged battery. The power-path management architecture also permits the battery to supplement the system current requirements when the adapter cannot deliver the peak system currents, enabling the use of a smaller adapter.

The battery is charged in three phases: conditioning, 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.

The charger power stage and charge current sense functions are fully integrated. The charger function has high-accuracy current and voltage regulation loops, charge status display, and charge termination. The input current limit and charge current are programmable using external resistors.