BQ24292I Datasheet, PDF (2/42 Pages) Texas Instruments – I2C Controlled 4.5A Single Cell USB/Adapter Charger With Narrow VDC Power Path Management and USB OTG

bq24292i
SLUSBI4 – APRIL 2013
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
DESCRIPTION
The bq24292i 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 smartphone, 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 solution.
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 device detects the input source following the
USB battery charging spec 1.2, and takes the results from detection circuit in the system, such as USB PHY
device. The device is compliant with USB 2.0 and USB 3.0 power specifications with input current and voltage
regulation. Meanwhile, the device supports USB On-the-Go operation by providing fast startup and supplying 5V
on the VBUS with a current limit up to 1.3A.
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 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 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 device provides various safety features for battery charging and system operation, including dual pack
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 device indicates if a
good power source is present. The INT immediately notifies the host when a fault occurs.
The device is available in a 24-pin, 4x4 mm² thin QFN package.
bq24292i Device Table
I²C Address
USB Detection
Default VINDPM
Default Battery Voltage
Default Charge Current
Default Adapter Current Limit
Maximum Pre-charge Current
Charging Temperature Profile
Status Output
STAT During Fault
bq24292i
6BH
PSEL
4.44V
4.112V
1.024A
1.5A
640mA
Cold/Hot
2 TS pins
STAT, PG
10k to ground
PART NUMBER
bq24292i
PART MARKING
bq24292i
ORDERING INFORMATION
PACKAGE
24-pin 4mmx4mm VQFN
ORDERING NUMBER
bq24292iRGER
bq24292iRGET
QUANTITY
3000
250
2
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