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BQ24030-Q1: The IC temperature increase at voltage (AC pin) greater than 7.5V

Muhammad Faris Roslan
Prodigy 20 points

Part Number: BQ24030-Q1

Hi.

From the datasheet, it stated that the AC pin input capable to supply from –0.3 V to 18 V. 
My device used 12V input connected to the AC pin. But, the temperature of the IC keeps getting hot until all the LED light off and the IC stop regulate the voltage.
If I changed the AC input to 7.5V, the IC works in good condition. 
Is there anything wrong with my circuit?

Regards,

Faris Roslan

  • 0
    TI__Mastermind 21590 points

    Hello Muhammad.

    The BQ24031-Q1 is a linear device. This means that as the voltage or current through the device increase so will the power being dissipated. That is why you see a high temperature at 12V vs at 7.5V. Even though the AC input can work up to 16V, the power dissipation will still have to be within the limits of the device which means the current capability is reduced at higher input voltages. If high input voltage is required with high load, i'll suggest using a switching charger like the BQ25606 or BQ24105-Q1