The bq24196 is highly-integrated switch-mode battery charge management and
system power path management devices for single cell Li-Ion and Li-polymer battery in a wide range
of tablet and other portable devices.
Its low impedance power path optimizes switch-mode operation efficiency, reduces battery
charging time and extends battery life during discharging phase. The I2C
serial interface with charging and system settings makes the device a truly flexible
The device supports a wide range of input sources, including standard
USB host port, USB charging port and high power DC adapter. The bq24196 takes the result from
detection circuit in the system, such as USB PHY device. The bq24196 is compliant with USB 2.0 and
USB 3.0 power spec with input current and voltage regulation. Meanwhile, the bq24196 meets USB
On-the-Go operation power rating specification by supplying 5 V on VBUS with current limit up to
The power path management regulates the system slightly above battery voltage but does
not drop below 3.5-V minimum system voltage (programmable). With this feature, the system maintains
operation even when the battery is completely depleted or removed. When the input current limit or
voltage limit is reached, the power path management automatically reduces the charge current to
zero. As the system load continues to increase, the power path discharges the battery until the
system power requirement is met. This supplement mode operation prevents overloading the input
The device initiates and completes a charging cycle without software
control. It automatically detects the battery voltage and charges the battery in three phases:
pre-conditioning, constant current and constant voltage. At the end of the charging cycle, the
charger automatically terminates when the charge current is below a preset limit in the constant
voltage phase. When the full battery falls below the recharge threshold, the charger will
automatically start another charging cycle.
The device provides various safety features for battery charging and
system operation, including negative thermistor monitoring, charging safety timer and
over-voltage/over-current protections. The thermal regulation reduces charge current when the
junction temperature exceeds 120°C (programmable).
The STAT output reports the charging status and any fault conditions.
output in the bq24196 indicates if a good power source is present. The INT immediately
notifies the host when a fault occurs.
The bq24196 is available in a 24-pin, 4.00 × 4.00
mm2 thin VQFN package.
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