1-cell, 1-A, Li-ion linear battery charger w/ 10kΩ NTC

The BQ2409x series of devices are highly

integrated Li-ion and Li-Pol linear chargers devices targeted at space-limited

portable applications. The devices operate from either a USB port or AC adapter. The

high input voltage range with input overvoltage protection supports low-cost

unregulated adapters.

The BQ2409x 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, charge status display, and charge termination. The pre-charge current and termination current threshold are programmed via an external resistor. The fast charge current value is also programmable via an external resistor.