BQ24298_15 Datasheet, PDF (3/51 Pages) Texas Instruments – bq24298 I2C Controlled 3A Single Cell USB Charger With Narrow VDC Power Path Management and Adjustable Voltage USB OTG

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bq24298
SLUSC59 – APRIL 2015
5 Description (Continued)
The I²C serial interface with charging and system settings makes the device a truly flexible solution.
The device supports 3.9V – 6.2V USB input sources, including standard USB host port and USB charging port
with 6.4V over-voltage protection. The device supports USB 2.0 and USB 3.0 power specifications with input
current and voltage regulation. To set the default input current limit, the bq24298 takes the result from the
detection circuit in the system, such as USB PHY device. The device also supports USB On-the-Go operation by
providing fast startup and supplying adjustable voltage 4.55 – 5.5V (default 5V) on the VBUS with an accurate
current limit up to 1.5A.
The power path management regulates the system slightly above battery voltage but does not drop below 3.5V
minimum system voltage (programmable). With this feature, the system keeps operating even when the battery
is completely depleted or removed. When the input source current or voltage limit is reached, the power path
management automatically reduces the charge current to zero and then starts discharges the battery until the
system power requirement is met. This supplement mode operation keeps the input source from getting
overloaded.
The device initiates and completes a charging cycle when host control is not available. It automatically charges
the battery in three phases: pre-conditioning, constant current and constant voltage. In the end, the charger
automatically terminates when the charge current is below a preset limit in the constant voltage phase. Later on,
when the battery voltage falls below the recharge threshold, the charger will automatically start another charging
cycle.
The charge 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 INT immediately notifies host when
fault occurs.
The bq24298 is available in a 24-pin, 4.00-mm x 4.00-mm thin WQFN package.
Copyright © 2015, Texas Instruments Incorporated
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