Datasheet

bq24190, bq24192

bq24192I, bq24193

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SLUSAW5A –JANUARY 2012–REVISED OCTOBER 2012

Thermal Regulation and Thermal Shutdown

The bq24190, bq24192, bq24192I, bq24193 monitors the internal junction temperature T

to avoid overheat the

chip and limits the IC surface temperature. When the internal junction temperature exceeds the preset limit

(REG06[1:0]), the device lowers down the charge current. The wide thermal regulation range from 60°C to 120°C

allows the user to optimize the system thermal performance.

During thermal regulation, the actual charging current is usually below the programmed battery charging current.

Therefore, termination is disabled, the safety timer runs at half the clock rate, and the status register REG08[1]

goes high.

Additionally, the device has thermal shutdown to turn off the converter. The fault register REG09[5:4] is 10 and

an INT is asserted to the host.

Voltage and Current Monitoring in Buck Mode

The bq24190, bq24192, bq24192I, bq24193 closely monitors the input and system voltage, as well as HSFET

and LSFET current for safe buck mode operation.

Input Over-Voltage (ACOV)

The maximum input voltage for buck mode operation is 18V. If VBUS voltage exceeds 18V, the device stops

switching immediately. During input over voltage (ACOV), the fault register REG09[5:4] will be set to 01. An INT

is asserted to the host.

System Over-Voltage Protection (SYSOVP)

The charger device monitors the voltage at SYS. When system over-voltage is detected, the converter is stopped

to protect components connected to SYS from high voltage damage.

Voltage and Current Monitoring in Boost Mode

The bq24190, bq24192, bq24192I, bq24193 closely monitors the VBUS voltage, as well as HSFET and LSFET

current to ensure safe boost mode operation.

VBUS Over-Voltage Protection

The boost mode regulated output is 5V. When an adapter plugs in during boost mode, the VBUS voltage will rise

above regulation target. Once the VBUS voltage exceeds 5.3V, the bq24190, bq24192, bq24192I, bq24193 stops

switching and the device exits boost mode. The fault register REG09[6] is set high to indicate fault in boost

operation. An INT is asserted to the host.

Battery Protection

Battery Over-Current Protection (BATOVP)

The battery over-voltage limit is clamped at 4% above the battery regulation voltage. When battery over voltage

occurs, the charger device immediately disables charge. The fault register REG09[5] goes high and an INT is

asserted to the host.

Charging During Battery Short Protection

If the battery voltage falls below 2V, the charge current is reduced to 100mA for battery safety.

System Over-Current Protection

If the system is shorted or exceeds the over-current limit, the BATFET is latched off. DC source insertion on

VBUS is required to reset the latch-off condition and turn on BATFET.

Product Folder Links: bq24190 bq24192 bq24192I bq24193