bq24160, bq24161
bq24163, bq24168
SLUSAO0A –NOVEMBER 2011–REVISED MARCH 2012
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These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
DESCRIPTION (CONTINUED)
The power path management feature allows the bq2416x 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. Under normal battery charging conditions, the
system voltage is approximately equal to the battery voltage, however if the battery is deeply discharged, the
system voltage does 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 2.5A input current capability allows for GSM phone calls as soon as the adapter is plugged in
regardless of the battery voltage. The charge parameters are programmable using the I2C interface.
The battery is charged in three phases: precharge, fast-charge 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, a voltage-based battery pack thermistor monitoring
input (TS) is included that monitors battery temperature for safe charging. The TS function for bq24160, bq24163
and bq24168 is JEITA compatible.
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