BQ24262_15 Datasheet, PDF (23/56 Pages) Texas Instruments – bq2426x 3-A, 30-V, Host-Controlled Single-Input, Single-Cell Switched-Mode Li-Ion Battery Charger With Power-Path Management and USB-OTG Support

Not Recommended for New Designs : bq24260, bq24261
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Device Functional Modes (continued)
bq24260, bq24261, bq24261M, bq24262
SLUSBU4D – DECEMBER 2013 – REVISED APRIL 2015
Start Safety Timer
Safety timer expired? ^Yes
No
Charge Done?
I_CHG < I_TERM
No
Yes ^{STAT = Hi}
Update STAT
bits
No
I²C Write
performed?
Yes
Start watchdog timer
Safety timer
fault
Charging suspended
Enter suspended
mode
Fault indicated in
STAT registers
Charge Done? ^Yes
I_CHG < I_TERM
STAT = Hi
Update STAT
bits
Reset watchdog timer
No
Yes
Safety timer expired?
Safety timer
fault
No
WD timer expired?
Yes
Charging suspended
Enter suspended
mode
Fault indicated in
STAT registers
No
Yes
No
Received
software watchdog
RESET?
Reset to default
values in I²C
register
Restart 2 min
safety timer
Figure 12. Watchdog Timer Flow Chart for bq24260/1/1M
9.4.15 LDO Output (DRV)
The bq24260/1/1M/2 contains a linear regulator (DRV) that is used to supply the internal MOSFET drivers and
other circuitry. Additionally, DRV supplies up to 10mA external loads to power the STAT LED or the USB
transceiver circuitry. The maximum value of the DRV output is 5.3 V so it ideal to protect voltage sensitive USB
circuits. The LDO is on whenever a supply is connected to the input of the bq24260/1/1M/2. The DRV is disabled
under the following conditions:
• V_SUPPLY < UVLO
• V_SUPPLY < V_BAT + V_SLP
• Thermal Shutdown
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Product Folder Links: bq24260 bq24261 bq24261M bq24262