BQ24314C Datasheet, PDF (12/26 Pages) Texas Instruments – Li+ Charger Front-End Protection IC

bq24314C
SLUSAV3A – AUGUST 2012 – REVISED JULY 2015
8 Application and Implementation
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NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The bq24314C device protects against overvoltage, overcurrent, and battery overvoltage events that occur due
to a faulty adapter or other input sources. If any of these faults occur, the bq24314C device isolates the
downstream devices from the input source and alerts the host controller with the FAULT open-drain output.
8.1.1 Powering Accessories
In some applications, the equipment that the protection IC resides in may be required to provide power to an
accessory (for example, a cellphone may power a headset or an external memory card) through the same
connector pins that are used by the adapter for charging. Figure 10 and Figure 11 illustrate typical charging and
accessory-powering scenarios:
Accessory
DIS
power supply
e.g.
cellphone
AC Adapter
IN OUT
bq24314x
to rest of
Charger
system
EN
Battery
pack
Figure 10. Charging - The Red Arrows Show the Direction of Current Flow
Accessory
EN
power supply
e.g.
cellphone
IN OUT
bq24314x
Charger
DIS
Battery
pack
to rest of
system
Figure 11. Powering an Accessory - The Red Arrows Show the Direction of Current Flow
In the second case, when power is being delivered to an accessory, the bq24314C device is required to support
current flow from the OUT pin to the IN pin.
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