BQ24153A Datasheet, PDF (21/43 Pages) Texas Instruments – Fully Integrated Switch-Mode One-Cell Li-Ion Charger

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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
bq24153A
bq24156A, bq24158
SLUSAB0 – OCTOBER 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 Identification)
During the charging process, if the input power source is not able to support the programmed or default charging
current, the VBUS voltage will decease. Once the VBUS drops to V_{IN_DPM} (default 4.52V), the charge current
begins to taper down to prevent any 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 makes the IC
compatible with adapters having different current capabilities.
Input Overvoltage Protection
The IC provides a built-in input overvoltage protection to protect the device and other components against
damage if the input voltage (Voltage from VBUS to PGND) goes too high. When an input overvoltage 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 overvoltage exit threshold, the fault is cleared and charge process
resumes.
Battery Protection in Charge Mode
Output Overvoltage Protection
The IC provides a built-in overvoltage 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 overvoltage 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 overvoltage exit threshold, the fault is cleared and charge process
resumes.
Copyright © 2010, Texas Instruments Incorporated
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Product Folder Link(s): bq24153A bq24156A bq24158