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Bq24092 thermal issue

Carol Liu
Prodigy 20 points
Other Parts Discussed in Thread: BQ24092, BQ24100, BQ24157, BQ24150A

I 'm now designing a charging board ,which is 2.1cm X 2.5cm. My charging current set on 800mA(In order to meet charging time requirement) .

when I charging a battery (voltage 3.5V), the IC surface temperature rise to above  65 degree C ,and the room temperature is 25 degree C.

the PCB is 0.8mm ,  Cu thickness is 65um.

Is there any method I can apply to inprove thermal performance .

or is there any suitable charging IC can have choose for  better thermal performance based on my current board size.

  • 0
    TI__Guru 65866 points

    Hello
    The bq24092 is a linear charger similar to a linear regulator (LDO) and will dissipate power across the internal pass element. If input voltage is 5V and battery voltage is 3.5V with charge current of 0.8A power dissipation on the device will be 1.2W. With a small PCB it is challenging to keep it cool.
    BQ24092 has internal thermal regulation that will reduce the change current when die temp reaches 125C and this will help to control the thermal rise. But the charging time requirement may not be meet due to reduced charge current.
    A switch move charger will dissipate less power, some to look at are the bq24100, bq24157 and bq24150A.

  • 0 in reply to Bill Johns
    Prodigy 20 points

    Thank you for your reply . 

    I will check switch charge IC your recommended