BQ24196_17 Datasheet, PDF (3/50 Pages) Texas Instruments – I2C Controlled 2.5-A Single Cell USB/Adapter Charger with Narrow VDC Power Path Management and USB OTG

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bq24196
SLUSB98A – OCTOBER 2012 – REVISED DECEMBER 2014
5 Description (Continued)
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 solution.
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 1.3 A.
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 source.
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. The PG 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 x 4.00 mm² thin VQFN package.
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