BQ24232 USB Friendly 0.5A Li+ Charger w/ Dynamic Power Management, 10.5V OVP | TI.com

BQ24232 (ACTIVE)

USB Friendly 0.5A Li+ Charger w/ Dynamic Power Management, 10.5V OVP

 

Description

The bq2423x series of devices are highly integrated Li-ion linear chargers and system power-path management devices targeted at space-limited portable applications. The devices operate from either a USB port or ac adapter and support 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 bq2423x 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 bq2423x 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.

Features

  • 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 Sources
  • 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 (bq24232)
  • Programmable Precharge and Fast-Charge Safety Timers
  • Reverse Current, Short-Circuit, and Thermal Protection
  • NTC Thermistor Input
  • Proprietary Start-Up Sequence Limits Inrush Current
  • Status Indication – Charging/Done, Power Good
  • Small 3 mm × 3 mm 16-Lead QFN Package

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Parametrics

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Part number Order Number of series cells Function Cell chemistry Charge current (Max) (A) Operating Vin (Min) (V) Operating Vin (Max) (V) Absolute Vin (safety rating) (Max) ((V)) Battery charge voltage (Min) (V) Battery charge voltage (Max) (V) Features Control interface Control topology Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
BQ24232 Order now 1     Charger     Li-Ion/Li-Polymer     0.5     4.35     10.2     28     4.2     4.2     OVP
Power Path
Temp Monitoring (Thermistor Pin)
UVLO
VINDPM    
Standalone (RC-Settable)     Linear     Catalog     -40 to 85     VQFN | 16     16VQFN: 9 mm2: 3 x 3 (VQFN | 16)    
BQ24078 Order now 1     Charger     Li-Ion/Li-Polymer     1.5     4.35     6.4     28     4.35     4.35     OVP
Power Path
Temp Monitoring (Thermistor Pin)
UVLO
VINDPM    
Standalone (RC-Settable)     Linear     Catalog     -40 to 85     VQFN | 16     16VQFN: 9 mm2: 3 x 3 (VQFN | 16)    
BQ24090 Order now 1     Charger     Li-Ion/Li-Polymer     1     4.45     6.45     12     4.2     4.2     OVP
Temp Monitoring (Thermistor Pin)
Thermal Regulation
UVLO
VINDPM    
Standalone (RC-Settable)     Linear     Catalog     0 to 125     MSOP-PowerPAD | 10     10MSOP-PowerPAD: 15 mm2: 4.9 x 3 (MSOP-PowerPAD | 10)    
BQ24232H Order now 1     Charger     Li-Ion/Li-Polymer     0.5     4.35     10.2     28     4.35     4.35     OVP
Power Path
Temp Monitoring (Thermistor Pin)
UVLO    
Standalone (RC-Settable)     Linear     Catalog     -40 to 85     VQFN | 16     16VQFN: 9 mm2: 3 x 3 (VQFN | 16)    
BQ25100 Order now 1     Charger     Li-Ion/Li-Polymer     0.25     4.45     6.45     30     4.2     4.2     JEITA BAT Temp Monitoring (Thermistor Pin)
OVP
Temp Monitoring (Thermistor Pin)
Thermal Regulation
VINDPM
UVLO    
Standalone (RC-Settable)     Linear     Catalog     0 to 125     DSBGA | 6     See datasheet (DSBGA)    
BQ25100H Order now 1     Charger     Li-Ion/Li-Polymer     0.25     4.45     6.45     30     4.35     4.35