BQ24153 Datasheet, PDF (21/40 Pages) Texas Instruments – Fully Integrated Switch-Mode One-Cell Li-Ion Charger With Full USB Compliance and USB-OTG Support

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Charge Command
(Host Control or VBUS
Ramps Up)
Delay 10mS
Enable Adaptor Detection
Start 30ms Timer
Enable Input Current Sink
(30mA, to GND)
No
bq24153
bq24156, bq24158
SLUSA27 – MARCH 2010
VBUS>VIN(MIN)?
Yes
30ms Timer
Expired?
No
Bad Adaptor Detected
Pulsing STAT Pin
Set Bad Adaptor Flag
Yes
Good Adaptor Detected
Disable Adaptor Detection
Charge Start
Enable VIN Based DPM
Delay TINT
(2 Seconds)
Figure 29. Bad Adaptor Detection Scheme FLow Chart
Input Voltage Based DPM (Special charger identifiction)
During the charging process, if the input power source is not able to support the programmed or default charging
current, VBUS voltage will decease. Once the VBUS drops to V_{IN_DPM} (default 4.52V), the charge current begins
to taper down to prevent the further drop of VBUS. When the IC enters this mode, the charge current is lower
than the set value and the special charger bit is set (B4 in Register 05H). This feature will make the IC
compatible with adapters with different current capabilities.
Input Over-Voltage Protection
The IC provides a built-in input over-voltage protection to protect the device and other components against
damage if the input voltage (Voltage from V_BUS to PGND) goes too high. When an input over-voltage condition is
detected, the IC turns off the PWM converter, sets fault status bits, and sends out a fault pulse from the STAT
pin. Once V_BUS drops below the input over-voltage exit threshold, the fault is cleared and charge process
resumes.
Battery Protection in Charge Mode
Output Over-Voltage Protection
The IC provides a built-in over-voltage protection to protect the device and other components against damage if
the battery voltage goes too high, as when the battery is suddenly removed. When an over-voltage condition is
detected, the IC turns off the PWM converter, sets fault status bits, and sends out a fault pulse from the STAT
pin. Once V_CSOUT drops to the battery over-voltage exit threshold, the fault is cleared and charge process
resumes.
Copyright © 2010, Texas Instruments Incorporated
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Product Folder Link(s): bq24153 bq24156 bq24158