bq24272

SLUSB09 – JUNE 2012

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The power path management feature allows the bq24272 to power the system from a high efficiency DC to 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 allows for proper charge termination and timer operation. The system voltage is regulated to the battery

voltage but will not drop below 3.5V. This minimum system voltage support enables the system to run with a

defective or absent battery pack and enables instant system turn-on even with a totally discharged battery or no

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. This enables 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. Additionally, the bq24272 offers a voltage-based battery pack thermistor

monitoring input (TS) that monitors battery temperature for safe charging.

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