bq25100 Li-Ion Battery Chargers

By Texas Instruments 94

bq25100 Li-Ion Battery Chargers

Texas Instruments' bq25100 devices are highly integrated, Li-Ion and Li-Pol linear chargers targeted at space-limited portable applications. The high input-voltage range with input over-voltage protection supports low-cost, unregulated adapters.

The bq25100 has a single-power output that charges the battery. A system load can be placed in parallel with the battery as long as the average system load does not keep the battery from charging fully during the 10-hour safety timer. 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 an 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 and charge termination. The pre-charge current and termination current threshold are programmed via an external resistor on the bq2510. The fast-charge current value is also programmable via an external resistor.

Features
  • Charging
    • 1% charge voltage accuracy
    • 10% charge current accuracy
    • Supports applications for very low charge currents: 10 mA to 250 mA
    • Supports minimum 1 mA charge termination current
    • Ultra-low-battery output leakage current: maximum 75 nA
    • Adjustable termination and precharge threshold
    • High-voltage chemistry support: 4.35 V with bq25100H/01H and 4.30 V with bq25100A
  • System
    • Automatic termination and timer disable mode (TTDM) for absent battery pack
    • Available in small, 1.6 mm x 0.9 mm DSBGA package
  • Protection
    • 30 V input rating with 6.5 V input overvoltage protection
    • Input voltage dynamic power management
    • 125°C thermal regulation; 150°C thermal shutdown protection
    • OUT short-circuit protection and ISET short detection
    • Operation over JEITA range via battery NTC: ½ fast-charge-current at cold, 4.06 V (bq25100/01), or 4.2 V (bq25100H/01H) at hot
    • Fixed 10-hour safety timer
Applications
  • Fitness and wearable electronics
  • Power bank solutions
  • Electronic point-of-sale solutions
  • Portable audio solutions

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