BQ24190_15 Datasheet, PDF (3/52 Pages) Texas Instruments – bq2419x I2C Controlled 4.5-A Single Cell USB/Adapter Charger with Narrow VDC Power Path Management and USB OTG

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bq24190, bq24192, bq24192I
SLUSAW5B – JANUARY 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. To set the default input current limit, the bq24190 detects the input source following the
USB battery charging spec 1.2, and the bq24192 and bq24192I take the results from detection circuit in the
system, such as USB PHY device. The bq24190,192, and 192I are compliant with USB 2.0 and USB 3.0 power
specifications with input current and voltage regulation. Meanwhile, the bq24190, bq24192, and bq24192I meet
USB On-the-Go operation power rating specification by supplying 5 V on the VBUS with a 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 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 bq24190, bq24192, and bq24192I provide 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 bq24192 and
bq24192I indicates if a good power source is present. The INT immediately notifies the host when a fault occurs.
The bq24190, bq24192, and bq24192I are available in a 24-pin, 4.00 x 4.00 mm² thin VQFN package.
6 Device Comparison 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
bq24190
6BH
D+/D–
4.36 V
4.208 V
2.048 A
1.5 A
2.048 A
Cold/Hot
2 TS pins
STAT
Blinking at 1 Hz
bq24192
6BH
PSEL
4.36 V
4.208 V
2.048 A
3A
2.048 A
Cold/Hot
2 TS pins
STAT, PG
Blinking at1 Hz
bq24192I
6BH
PSEL
4.44 V
4.112 V
1.024 A
1.5 A
640 mA
Cold/Hot
2 TS pins
STAT, PG
10 k to ground
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