The bq24195L, bq24195 are 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 power bank, 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. To set the default input current limit,
the bq24195L, bq24195 detects the input source following the USB battery charging spec 1.2. The
bq24195/bq24195L are compliant with USB 2.0 and USB 3.0 power specifications with input current and
voltage regulation. The bq24195L, bq24195 supports battery boost operation by supplying 5.1 V on
PMID pin with minimum current of 1.0 A (bq24195L) or 2.1 A (bq24195).
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 devices initiate and complete 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 devices provide 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.
The INT immediately
notifies the host when a fault occurs.
The bq24195 and bq24195L are available in a 24-pin, 4.00 × 4.00
mm2 thin VQFN package.