BQ24266_15 Datasheet, PDF (25/41 Pages) Texas Instruments – bq24266 3A, 30V Standalone Single-Input, Single-Cell Switchmode Li-Ion Battery Charger

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bq24266
SLUSBY5F – JUNE 2014 – REVISED AUGUST 2015
7.4.16.3 CHG and PG During Boost Mode
During boost mode, the CHG and PG outputs are high impedance.
7.4.16.4 Protection in Boost Mode
7.4.16.4.1 Output Over-Voltage Protection
The bq24266 contains integrated over-voltage protection on the IN pin. During boost mode, if an over-voltage
condition is detected (V_IN > V_BOOSTOVP), after deglitch t_{DGL(BOOST_OVP)}, the IC turns off the PWM converter unitl the
IUSB pins are toggled. The converter does not restart when V_IN drops to the normal level until the IUSB pins are
toggled.
7.4.16.4.2 Output Over-Current Protection
The bq24266 contains over current protection to prevent the device and battery damage when IN is overloaded.
When an over-current condition occurs, the cycle-by-cycle current limit limits the current from the battery to the
load. If the overload condition lasts for 8ms, the overload fault is detected. When an overload condition is
detected, the bq24266 turns off the PWM converter. The boost operation starts only after the fault is cleared and
the IUSB pins are toggled.
7.4.16.4.3 Battery Voltage Protection
During boost mode, when the battery voltage is below the minimum battery voltage threshold, V_BATUVLO, the IC
turns off the PWM converter. Once the battery voltage returns to the acceptable level, the boost starts only after
the IUSB pins are toggled. Proper operation below 3.3V down to the V_BATUVLOis not specified.
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